Terbium compounds are compounds formed by the lanthanide metal terbium (Tb). Terbium generally exhibits the +3 oxidation state in these compounds, such as in TbCl3, Tb(NO3)3 and Tb(CH3COO)3. Compounds with terbium in the +4 oxidation state are also known, such as TbO2 and BaTbF6. [1] Terbium can also form compounds in the 0, [2] [3] +1 [4] and +2 oxidation states.
The trivalent terbium ion (Tb3+) is generally colorless in aqueous solution, and when it is irradiated by certain wavelengths of ultraviolet light (such as 254 nm or 365 nm) in solution or crystal form, it will emit green fluorescence. This property has given rise to applications in fields such as optics. [5] The tetravalent terbium ion (Tb4+) is non-luminescent and its coexistence with Tb3+ will reduce the green emission of Tb3+. [6]
Formula | appearance | symmetry | space group | No | a (nm) | b (nm) | c (nm) | density, g/cm3 |
---|---|---|---|---|---|---|---|---|
TbBr3 | white powder (hexahydrate) [7] | trigonal | R3 | 148 | 4.62 [8] | |||
TbCl3 | white powder | hexagonal | P63/m | 176 | 4.35 | |||
TbF3 | white solid | hexagonal [9] | 7.035 [9] | 6.875 [9] | 7.23 [10] | |||
Tb(OH)3 | white solid [11] | |||||||
TbI3 | hydroscopic crystals | trigonal [12] [13] | R3 | 148 | 5.2 | |||
Tb(NO3)3 | colourless crystals (hexahydrate) [14] | monoclinic [15] | P21/c | 14 | 1.2870 | 1.6590 | 2.8723 | |
Tb2O3 | white crystals | cubic | Ia3 [16] | 206 [16] | 1.057 | 7.91 | ||
TbO2 | dark-coloured [17] | cubic | ||||||
TbP | black crystals | cubic | Fm3m | 225 | 0.56402 | 6.82 | ||
Tb4O7 | dark brown-black solid | orthorhombic | R3 [18] | 148 | 6.5082 | 7.3 | ||
Tb11O20 | solid | triclinic | P1 | 2 | 6.50992 | 9.8298 | 6.4878 | |
TbAsO4 | solid | orthorhombic [19] | Fddd | 70 | 7.09 | 6.32 | ||
TbAsO4 | solid | tetragonal [19] | I41/amd | 141 | 10.081 | 9.957 | 6.321 | |
TbSbO4 | green (under UV light) | monoclinic [20] | P21/m | 11 | ||||
TbSe | yellow-red solid [21] | cubic | Fm3m [22] | 225 |
Terbium has a variety of oxides. The most easily obtained is terbium(III,IV) oxide, which can be produced by the decomposition of terbium compounds such as the hydroxide, [23] the oxalate [24] and the p-aminobenzoate. [25] Terbium(III,IV) oxide, because the oxide contains both trivalent terbium and tetravalent terbium, can be produced by reacting with nitric acid to produce terbium nitrate, releasing oxygen in the progress: [23]
It is refluxed in a mixture of acetic acid and hydrochloric acid, which can separate trivalent and tetravalent terbium: [26]
It reacts with dicyandiamide at a high temperature to obtain Tb2O2CN2. [27]
Another common oxide of terbium is terbium(III) oxide, which can be obtained from the reduction of hydrogen from terbium(III,IV) oxide at 1300 °C. [28] A p-type semiconductor is formed after doping with calcium. [29]
Terbium(IV) oxide can be prepared by treating terbium(III,IV) oxide with dilute hydrochloric acid, [30] its hydrate TbO2·xH2O can be obtained by oxidizing terbium(III) hydroxide with potassium persulfate in the presence of silver nitrate. [31] Terbium(IV) oxide can form mixed crystals with praseodymium(IV) oxide. [32]
Terbium(III) sulfide is one of the sulfides of terbium, which can be obtained by reacting with sulfur in a stoichiometric ratio. [33] It can also be obtained by reacting terbium(III,IV) oxide with carbon disulfide and hydrogen sulfide at high temperature. [34] It reacts with hydrofluoric acid solution to give terbium(III) fluoride hemihydrate. [34] Terbium(III) selenide can be obtained by the reaction of terbium polyselenide TbSe1.9 with metal terbium, which can form black needle-like crystals with U2S3 structure and space group Pnma. [35] Terbium monochalcogenides, TbZ (Z = S, Se or Te), can be prepared by directly reacting terbium with the corresponding chalcogen. These chalcogenides are black and have a NaCl structure. They have metallic conductivity and consist of Ln3+ and Z2- ions with 1 electron from each cation delocalized in a conduction band. [17]
Terbium can form four trihalides in the form TbX3 (X=F, Cl, Br, I), which, except the fluoride, are easily soluble in water, and are strong electrolytes in water. They can be prepared by reacting terbium with the corresponding halogen: [36]
Anhydrous terbium halides can be prepared by reacting oxides or halides hydrates: [37]
Terbium(II) halides are obtained by annealing Tb(III) halides in presence of metallic Tb in tantalum containers. Terbium also forms a sesquichloride Tb2Cl3, which can be further reduced to TbCl by annealing at 800 °C. This terbium(I) chloride forms platelets with layered graphite-like structure. [38]
Terbium(IV) fluoride is the only halide that tetravalent terbium can form, and has strong oxidizing properties. It is also a strong fluorinating agent, emitting relatively pure atomic fluorine when heated, rather than the mixture of fluoride vapors emitted from cobalt(III) fluoride or cerium(IV) fluoride. [39] It can be obtained by reacting terbium(III) chloride or terbium(III) fluoride with fluorine gas at 320 °C: [40]
When TbF4 and CsF is mixed in a stoichiometric ratio, in a fluorine gas atmosphere, CsTbF5 is obtained. It is an orthorhombic crystal, with space group Cmca, with a layered structure composed of [TbF8]4− and 11-coordinated Cs+. [41] The compound BaTbF6 can be prepared in a similar method. It is an orthorhombic crystal, with space group Cmma. The compound [TbF8]4− also exists. [42]
Organoterbium compounds are a class of organic metal compounds containing Tb-C bonds. The cyclopentadienyl complexes of terbium were studied in the early stage. They can be prepared by the reaction of sodium cyclopentadienide and anhydrous terbium halide in tetrahydrofuran, such as: [43]
However, this compound has limited usage and academic interest. [44]
Like the other lanthanides, metal-carbon σ bonds are found in alkyls of terbium such as [TbMe6]3− and Tb[CH(SiMe3)2]3. [44] The alkyls and aryls can be prepared by metathesis in tetrahydrofuran on ether solutions: [17]
Terbium(III) sulfate can be obtained by the reaction of terbium(III,IV) oxide and concentrated sulfuric acid. It can crystallize colorless octahydrate crystals in water, which is isostructural with the corresponding praseodymium compound. [45] The anhydrate can be obtained by heating the octahydrate, and an exothermic reaction occurs when the anhydrate is rehydrated. [46] Terbium(III) hydroxide can be obtained by reacting terbium with water. [36] It reacts with acids to produce terbium(III) salts. It decomposes to TbO(OH) at an elevated temperature, and upon further heating, will decompose to terbium(III) oxide. [11]
Terbium(III) nitrate can be obtained by reacting terbium(III) oxide with nitric acid and crystallizing. The crystals are dried with 45~55% sulfuric acid to obtain the hexahydrate. [47] The basic salt TbONO3 can be obtained by heating the hydrate, and its anhydrate can be obtained by the reaction of terbium(III) oxide and dinitrogen tetroxide. [48] Terbium(III) phosphate can be obtained by the reaction of diammonium hydrogen phosphate and terbium(III) nitrate, and the reaction produces a hexagonal monohydrate, which can emit the characteristic green light of terbium (543 nm) under the excitation of 355 nm wavelength. [49] It can also be obtained by the reaction of sodium phosphate and terbium(III) chloride in solution, and the precipitated dihydrate is calcined at 800 °C to obtain the anhydrous form. [50] Terbium(III) arsenate is an orthorhombic crystal at 77 K with space group Fddd, and undergoes a phase transition at 27.7 K to form a tetragonal crystal with space group I41/amd, [19] which is a ferromagnet below 1.5 K. [19] It can be produced by reacting sodium arsenate and terbium(III) chloride. [51] Terbium(III) antimonate (TbSbO4) is a monoclinic crystal with space group P21/m (No. 11). [20]
Terbium(III) carbonate can be obtained by reacting terbium(III) chloride with saturated carbon dioxide solution in sodium bicarbonate, and the product also needs to be washed with water saturated with carbon dioxide. [52] The germanates TbIII13(GeO4)6O7(OH) and K2TbIVGe2O7 can be synthesized at high temperature and pressure, and they are colorless crystals of trigonal and monoclinic systems, respectively. [53] The tetrahydrate of terbium(III) acetate can lose hydration at 60 °C, obtaining the anhydrate at 180 °C, which starts to decompose at 220 °C, forming terbium oxide at 650 °C. [54]
Terbium borate can be obtained by reacting terbium oxide with boric acid: [55]
The single crystal of its hexagonal phase can be obtained by the Czochralski method; it can also form a solid of the triclinic system, which can be obtained by the sol-gel method. [56] The composite borates TbFe3(BO3)4 and TbAl3(BO3)4 can also be obtained by a similar method. [57] [58] Terbium(III) oxide, terbium(III) chloride and boron trioxide react in a caesium chloride solution to obtain terbium oxychloride borate Tb4O4Cl(BO3), which is a monoclinic crystal with space group P21/n. [59] Both aluminate Tb3Al5O12 [60] and gallate Tb3Ga5O12 [61] [62] can be used as magneto-optical materials.
All the terbium pnictides form crystals of the cubic crystal system, with the space group of Fm3m. [63] [64] [65] Terbium phosphide can be obtained by reacting sodium phosphide and anhydrous terbium(III) chloride at 700 to 800˚C. [66] It undergoes a phase transition at 40 GPa from a NaCl-structure to a CsCl-structure. [67] It can be sintered with zinc sulfide to make a green phosphor layer. [68]
Terfenol-D is an alloy of terbium, iron and dysprosium, with the formula of Tb x Dy 1−x Fe 2. It was initially developed in the 1970s by the Naval Ordnance Laboratory in the United States. The technology for manufacturing the material efficiently was developed in the 1980s at Ames Laboratory under a U.S. Navy-funded program. [69] It has the highest magnetostriction of any alloy, with up to 0.002 m/m at saturation. [70] It possess nearly zero magnetocrystalline anisotropy and so exhibits very large magnetostriction at low magnetic fields. [71] Terfenol-D is mostly used for its magnetostrictive properties, in which it changes shape when exposed to magnetic fields in a process called magnetization. Magnetic heat treatment is shown to improve the magnetostrictive properties of Terfenol-D at low compressive stress for certain ratios of Tb and Dy. [72]
Victorium [73] (also called monium, meaning "alone", because its spectral lines stood alone at the end of the ultraviolet spectrum [74] ) is an alloy of gadolinium and terbium, which was misidentified as a chemical element in 1898 by the English chemist William Crookes. He identified the new substance, based on an analysis of the unique phosphorescence and other ultraviolet-visible spectral phenomena, as a new chemical element. However, in 1905, French chemist Georges Urbain had proven that to be false, and in fact, a impurity of gadolinium and terbium. [75]
Terbium compounds do not have many applications. However, compounds of trivalent terbium can emit green light under excitation, such as terbium(III) oxide which can be used in cathode-ray tube televisions. [76] Terbium compounds are also used in optics due to this property. [5] In addition, terbium compounds have other applications. For example, TbFe2-based compounds can be used as magnetostrictive materials, [77] dielectric Tb3Ga5O12 and Tb3Al5O12 can be used as magneto-optical materials, [60] [61] [62] terbium(III) fluoride is used for the production of fluoride glasses and electroluminescent thin films and luminescent zinc sulfide [78] and terbium gatifloxacin can be used as drugs. [79] Terbium phosphide is a semiconductor used in high power, high frequency applications and in laser diodes and other photo diodes. [80] CePO4:Tb (Cerium phosphate doped terbium) has potential application in biological imaging and cellular labeling. [81]
Alloys containing terbium are used in the production of electronic devices, mostly as a component of Terfenol-D. The alloy is used in actuators, [82] in sensors, in the SoundBug device (its first commercial application), hydraulic valve drivers [83] and other magnetomechanical devices. It is also used in naval sonar systems. Its strain is also larger than that of another normally used material (PZT8), which allows Terfenol-D transducers to reach greater depths for ocean explorations than past transducers. [84] Its low Young's Modulus brings some complications due to compression at large depths, which are overcome in transducer designs that may reach 1000 ft in depth and only lose a small amount of accuracy of around 1 dB. [83] Due to its high temperature range, Terfenol-D is also useful in deep hole acoustic transducers where the environment may reach high pressure and temperatures like oil holes. Terfenol-D may also be used for hydraulic valve drivers due to its high strain and high force properties. [83] Similarly, magnetostrictive actuators have also been considered for use in fuel injectors for diesel engines because of the high stresses that can be produced. [85]
Holmium is a chemical element; it has symbol Ho and atomic number 67. It is a rare-earth element and the eleventh member of the lanthanide series. It is a relatively soft, silvery, fairly corrosion-resistant and malleable metal. Like many other lanthanides, holmium is too reactive to be found in native form, as pure holmium slowly forms a yellowish oxide coating when exposed to air. When isolated, holmium is relatively stable in dry air at room temperature. However, it reacts with water and corrodes readily, and also burns in air when heated.
Terbium is a chemical element; it has the symbol Tb and atomic number 65. It is a silvery-white, rare earth metal that is malleable, and ductile. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.
Neodymium(III) chloride or neodymium trichloride is a chemical compound of neodymium and chlorine with the formula NdCl3. This anhydrous compound is a mauve-colored solid that rapidly absorbs water on exposure to air to form a purple-colored hexahydrate, NdCl3·6H2O. Neodymium(III) chloride is produced from minerals monazite and bastnäsite using a complex multistage extraction process. The chloride has several important applications as an intermediate chemical for production of neodymium metal and neodymium-based lasers and optical fibers. Other applications include a catalyst in organic synthesis and in decomposition of waste water contamination, corrosion protection of aluminium and its alloys, and fluorescent labeling of organic molecules (DNA).
Terbium(III,IV) oxide, occasionally called tetraterbium heptaoxide, has the formula Tb4O7, though some texts refer to it as TbO1.75. There is some debate as to whether it is a discrete compound, or simply one phase in an interstitial oxide system. Tb4O7 is one of the main commercial terbium compounds, and the only such product containing at least some Tb(IV) (terbium in the +4 oxidation state), along with the more stable Tb(III). It is produced by heating the metal oxalate, and it is used in the preparation of other terbium compounds. Terbium forms three other major oxides: Tb2O3, TbO2, and Tb6O11.
Ytterbium(III) chloride (YbCl3) is an inorganic chemical compound. It reacts with NiCl2 to form a very effective catalyst for the reductive dehalogenation of aryl halides. It is poisonous if injected, and mildly toxic by ingestion. It is an experimental teratogen, known to irritate the skin and eyes.
Terbium(III) chloride (TbCl3) is a chemical compound. In the solid state TbCl3 has the YCl3 layer structure. Terbium(III) chloride frequently forms a hexahydrate.
Few compounds of californium have been made and studied. The only californium ion that is stable in aqueous solutions is the californium(III) cation. The other two oxidation states are IV (strong oxidizing agents) and II (strong reducing agents). The element forms a water-soluble chloride, nitrate, perchlorate, and sulfate and is precipitated as a fluoride, oxalate or hydroxide. If problems of availability of the element could be overcome, then CfBr2 and CfI2 would likely be stable.
Berkelium forms a number of chemical compounds, where it normally exists in an oxidation state of +3 or +4, and behaves similarly to its lanthanide analogue, terbium. Like all actinides, berkelium easily dissolves in various aqueous inorganic acids, liberating gaseous hydrogen and converting into the trivalent oxidation state. This trivalent state is the most stable, especially in aqueous solutions, but tetravalent berkelium compounds are also known. The existence of divalent berkelium salts is uncertain and has only been reported in mixed lanthanum chloride-strontium chloride melts. Aqueous solutions of Bk3+ ions are green in most acids. The color of the Bk4+ ions is yellow in hydrochloric acid and orange-yellow in sulfuric acid. Berkelium does not react rapidly with oxygen at room temperature, possibly due to the formation of a protective oxide surface layer; however, it reacts with molten metals, hydrogen, halogens, chalcogens and pnictogens to form various binary compounds. Berkelium can also form several organometallic compounds.
Lutetium(III) fluoride is an inorganic compound with a chemical formula LuF3.
Curium compounds are compounds containing the element curium (Cm). Curium usually forms compounds in the +3 oxidation state, although compounds with curium in the +4, +5 and +6 oxidation states are also known.
Terbium phosphide is an inorganic compound of terbium and phosphorus with the chemical formula TbP.
Lanthanide trichlorides are a family of inorganic compound with the formula LnCl3, where Ln stands for a lanthanide metal. The trichlorides are standard reagents in applied and academic chemistry of the lanthanides. They exist as anhydrous solids and as hydrates.
Neodymium compounds are compounds formed by the lanthanide metal neodymium (Nd). In these compounds, neodymium generally exhibits the +3 oxidation state, such as NdCl3, Nd2(SO4)3 and Nd(CH3COO)3. Compounds with neodymium in the +2 oxidation state are also known, such as NdCl2 and NdI2. Some neodymium compounds have colors that vary based upon the type of lighting.
Praseodymium compounds are compounds formed by the lanthanide metal praseodymium (Pr). In these compounds, praseodymium generally exhibits the +3 oxidation state, such as PrCl3, Pr(NO3)3 and Pr(CH3COO)3. However, compounds with praseodymium in the +2 and +4 oxidation states, and unlike other lanthanides, the +5 oxidation state, are also known.
Einsteinium compounds are compounds that contain the element einsteinium (Es). These compounds largely have einsteinium in the +3 oxidation state, or in some cases in the +2 and +4 oxidation states. Although einsteinium is relatively stable, with half-lives ranging from 20 days upwards, these compounds have not been studied in great detail.
Europium compounds are compounds formed by the lanthanide metal europium (Eu). In these compounds, europium generally exhibits the +3 oxidation state, such as EuCl3, Eu(NO3)3 and Eu(CH3COO)3. Compounds with europium in the +2 oxidation state are also known. The +2 ion of europium is the most stable divalent ion of lanthanide metals in aqueous solution. Many europium compounds fluoresce under ultraviolet light due to the excitation of electrons to higher energy levels. Lipophilic europium complexes often feature acetylacetonate-like ligands, e.g., Eufod.
Erbium compounds are compounds containing the element erbium (Er). These compounds are usually dominated by erbium in the +3 oxidation state, although the +2, +1 and 0 oxidation states have also been reported.
Ytterbium compounds are chemical compounds that contain the element ytterbium (Yb). The chemical behavior of ytterbium is similar to that of the rest of the lanthanides. Most ytterbium compounds are found in the +3 oxidation state, and its salts in this oxidation state are nearly colorless. Like europium, samarium, and thulium, the trihalides of ytterbium can be reduced to the dihalides by hydrogen, zinc dust, or by the addition of metallic ytterbium. The +2 oxidation state occurs only in solid compounds and reacts in some ways similarly to the alkaline earth metal compounds; for example, ytterbium(II) oxide (YbO) shows the same structure as calcium oxide (CaO).
Lutetium compounds are compounds formed by the lanthanide metal lutetium (Lu). In these compounds, lutetium generally exhibits the +3 oxidation state, such as LuCl3, Lu2O3 and Lu2(SO4)3. Aqueous solutions of most lutetium salts are colorless and form white crystalline solids upon drying, with the common exception of the iodide. The soluble salts, such as nitrate, sulfate and acetate form hydrates upon crystallization. The oxide, hydroxide, fluoride, carbonate, phosphate and oxalate are insoluble in water.
Americium compounds are compounds containing the element americium (Am). These compounds can form in the +2, +3, and +4, although the +3 oxidation state is the most common. The +5, +6 and +7 oxidation states have also been reported.
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