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Preparation of Alkoxy‐Derived Tantalum Vanadate
Author(s) -
Yamaguchi Osamu,
Mukaida Yasumichi,
Shigeta Hiroyasu
Publication year - 1989
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1989.tb06000.x
Subject(s) - orthorhombic crystal system , tantalum , vanadate , amorphous solid , alkoxy group , crystallography , hydrolysis , solid solution , materials science , chemistry , inorganic chemistry , crystal structure , metallurgy , organic chemistry , alkyl
Compound formation in the system Ta 2 O 5 –V 2 O 5 has been studied using amorphous materials prepared by the simultaneous hydrolysis of tantalum and vanadyl alkoxides. Three compounds exist in this system: 9Ta 2 O 5 · V 2 O 5 , 9Ta 2 O 5 ·2V 2 O 5 , and Ta 2 O 5 ·V 2 O 5 (TaVO 5 ). Solid solutions of δ‐Ta 2 O 5 are formed at low temperatures up to 10 mol% V 2 O 5 . They transform to β‐Ta 2 O 5 solid solutions at higher temperatures; the transformation temperature falls with increasing V 2 O 5 A new compound, 9Ta 2 O 5 ·V 2 O 5 , 670° to 755°. It has an orthorhombic unit cell with a = 0.7859 nm, b = 1.733 nm, and c = 1.766 nm. Orthorhombic TaVO 5 crystallized at 535° to 560° decomposes into 9Ta 2 O 5 °V 2 O 5 at 1010°.