Terbium (III) oxide

Crystal structure
	__ Tb 3+ __ O 2−
General
Surname	Terbium (III) oxide
other names	Diterbium trioxide; Terbium sesquioxide;
Ratio formula	Tb 2 O 3
Brief description	white solid
External identifiers / databases
EC number	234-849-5
ECHA InfoCard	100,031,668
PubChem	159410
Wikidata	Q419879
properties
Molar mass	365.85 g mol −1
Physical state	firmly
density	7.91 g cm −3
Melting point	2303 ° C
safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 315-319-335
	P: 261-305 + 351 + 338
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Terbium (III) oxide is a chemical compound , more precisely the oxide of terbium .

Occurrence

Terbium (III) oxide does not occur, of course. However, it occurs bound as a highly complex silicate z. B. in gadolinite .

Extraction and presentation

Terbium (III) oxide cannot be obtained directly from terbium and oxygen , since brown terbium (III, IV) oxide Tb ₄ O ₇ is formed. Instead, it is produced from this through controlled reduction with hydrogen .

{\ displaystyle \ mathrm {Tb_ {4} O_ {7} + H_ {2} \ longrightarrow 2 \ Tb_ {2} O_ {3} + H_ {2} O}}

properties

Physical Properties

As with other heavy lanthanoid oxides, two crystal structures are known of terbium (III) oxide . The normally stable structure is a cubic defective fluorite structure ( bixbyite structure) with the lattice parameter a = 1072 pm . This also occurs with other lanthanide oxides. A monoclinic structure of terbium (III) oxide is also known. This is created when crystallizing from terbium oxide / magnesium oxide melts.

Terbium (III) oxide is pure white to cream-colored, depending on its purity. Luminesce glasses with additions of terbium (III) oxide.

use

Pure terbium (III) oxide is hardly used or not used at all. Terbium (III, IV) oxide Tb ₄ O _{7 is} used as the starting material for the production of pure terbium .

Individual evidence

↑ ^a ^b ^c David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-94.
↑ ^a ^b Entry on diterbium trioxide in the GESTIS substance database of the IFA , accessed on February 10, 2017(JavaScript required) .
^ NN Greenwood, A. Earnshaw: Chemistry of the elements , 1st edition, VCH Verlagsgesellschaft, Weinheim 1988, ISBN 3-527-26169-9 .
↑ NC Baenzinger, HA Eick, HS Schuldt, L. Eyring: Terbium Oxides. III. X-Ray Diffraction Studies of Several Stable Phases . In: Journal of the American Chemical Society , 1961, 83, 10, pp. 2219-2223.
↑ E. Hubbert-Paletta, Hk. Müller-Buschbaum: X-ray investigation on single crystals of monoclinic Tb ₂ O ₃ . In: Journal for inorganic and general chemistry , 1968, 363, pp. 145-150, doi : 10.1002 / zaac.19683630306 .

[CRC_HANDBOOK-1] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-94.

[GESTIS-2] Entry on diterbium trioxide in the GESTIS substance database of the IFA , accessed on February 10, 2017(JavaScript required) .

[3] NN Greenwood, A. Earnshaw: Chemistry of the elements , 1st edition, VCH Verlagsgesellschaft, Weinheim 1988, ISBN 3-527-26169-9 .

[4] NC Baenzinger, HA Eick, HS Schuldt, L. Eyring: Terbium Oxides. III. X-Ray Diffraction Studies of Several Stable Phases . In: Journal of the American Chemical Society , 1961, 83, 10, pp. 2219-2223.

[5] E. Hubbert-Paletta, Hk. Müller-Buschbaum: X-ray investigation on single crystals of monoclinic Tb ₂ O ₃ . In: Journal for inorganic and general chemistry , 1968, 363, pp. 145-150, doi : 10.1002 / zaac.19683630306 .