Protactinium (V) oxide

General
Surname	Protactinium (V) oxide
Molecular formula	Pa 2 O 5
Brief description	white solid
External identifiers / databases
Wikidata	Q1096761
properties
Molar mass	542.07 g mol −1
Physical state	firmly
Hazard and safety information
	; Radioactive
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Protactinium (V) oxide is a chemical compound of protactinium and oxygen with the formula Pa ₂ O ₅ . It is a white, crystalline powder and crystallizes face-centered cubically with a lattice constant of 545.5 pm.

properties

Protactinium (V) oxide occurs in several polymorphic modifications, which can be specifically represented by a suitable choice of the test conditions. The cubic form is obtained by precipitating a Pa (V) salt solution, a protactinium (V) oxide hydrate being formed, which is dried and ignited in air at 600-700 ° C. Tetragonal protactinium (V) oxide is formed from the hydrate or the cubic oxide when heated in air to 700–900 ° C. Hexagonal protactinium (V) oxide is obtained either in a quartz ampoule in an oxygen atmosphere at 1075 ° C or in air at 1050 ° C. When heated in air to 1200–1500 ° C, this is partially converted into a rhombohedral modification.

safety instructions

Classifications according to the CLP regulation are not available because they only include the chemical hazard, which plays a completely subordinate role compared to the hazards based on radioactivity . The latter also only applies if the amount of substance involved is relevant.

use

Protactinium (V) fluoride can be obtained by reacting with bromine (III) fluoride or bromine (V) fluoride at 600 ° C.

{\ displaystyle {\ ce {3 Pa2O5 + 10 BrF3 (6 BrF5) -> 6 PaF5 + 5 Br2 (3 Br2) + 7.5 O2}}}

literature

Boris F. Myasoedov, Harold W. Kirby, Ivan G. Tananaev: Protactinium . (pdf) In: Lester R. Morss, Norman M. Edelstein, Jean Fuger (Eds.): The Chemistry of the Actinide and Transactinide Elements. Springer, Dordrecht 2006, ISBN 1-4020-3555-1 , pp. 161-252.

Individual evidence

^ ^A ^b Philip A. Sellers, Sherman Fried, Robert E. Elson, WH Zachariasen: The Preparation of Some Protactinium Compounds and the Metal. In: Journal of the American Chemical Society . 1954, 76, pp. 5935-5938, doi : 10.1021 / ja01652a011 .
↑ The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.
↑ Georg Brauer , with the collaboration of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1181 .
↑ Georg Brauer , with the collaboration of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1170 .

[Preparation_PA-1] A ^b Philip A. Sellers, Sherman Fried, Robert E. Elson, WH Zachariasen: The Preparation of Some Protactinium Compounds and the Metal. In: Journal of the American Chemical Society . 1954, 76, pp. 5935-5938, doi : 10.1021 / ja01652a011 .

[NV-2] The hazards emanating from radioactivity do not belong to the properties to be classified according to the GHS labeling. With regard to other hazards, this substance has either not yet been classified or a reliable and citable source has not yet been found.

[brauer-3] Georg Brauer , with the collaboration of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1181 .

[Bibbrauer-4] Georg Brauer , with the collaboration of Marianne Baudler a . a. (Ed.): Handbook of Preparative Inorganic Chemistry . 3rd, revised edition. tape I . Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , pp. 1170 .