Thermal Transformations of the Composition and Structure of Hexagonal Molybdenum Oxide Full article
Journal |
Journal of Structural Chemistry
ISSN: 0022-4766 , E-ISSN: 1573-8779 |
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Output data | Year: 2015, Volume: 56, Number: 2, Pages: 289-296 Pages count : 8 DOI: 10.1134/S0022476615020122 | ||||||
Tags | crystal texture, hygroscopic crystals, metastable phase, molybdenum oxide, structural water | ||||||
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Abstract:
Thermal transformations of the crystal structure and composition of the h-MoO3 metastable phase with a transition to the α-MoO3 stable modification are investigated. The study is performed using submicron phase-pure crystals exhibiting stability during their long storage in the air. By powder XRD, SEM, TGA, CHN, LMS, Raman and IR spectroscopy it is found: the composition of the deposited crystals is expressed by the general formula MoO3·0.26H2O; the impurity cationic composition consists of 1.8 wt.% of ammonia groups and a sum of 15 elements detected at a level of 10−4 wt.%. Thermal treatment of the crystals to T = 350 °C in the air results in the removal of adsorbed and structural water, OH−, and NH 4 + groups with retaining the h-phase of hygroscopic MoO3·0.08H2O. The h-MoO3·0.08H2O crystals obtained show instability during the storage and transform into the α-MoO3 stable modification. At T = 380 °C the h → α phase transition occurs with the removal of coordinated water and texture transformations resulting in the formation of α-MoO3 hygroscopic crystals that at T = 650 °C acquire the platelet shape characteristic of the α-phase.
Cite:
Troitskaia I.B.
, Gavrilova T.A.
, Zubareva A.P.
, Troitskii D.Y.
, Gromilov S.A.
Thermal Transformations of the Composition and Structure of Hexagonal Molybdenum Oxide
Journal of Structural Chemistry. 2015. V.56. N2. P.289-296. DOI: 10.1134/S0022476615020122 WOS Scopus РИНЦ
Thermal Transformations of the Composition and Structure of Hexagonal Molybdenum Oxide
Journal of Structural Chemistry. 2015. V.56. N2. P.289-296. DOI: 10.1134/S0022476615020122 WOS Scopus РИНЦ
ArticleLinkType.TRANSLATED_TO_ORIGINAL:
Троицкая И.Б.
, Гаврилова Т.А.
, Зубарева А.П.
, Троицкий Д.Ю.
, Громилов С.А.
Термические превращения состава и структуры гексагонального оксида молибдена
Журнал структурной химии. 2015. Т.56. №2. С.304-311. РИНЦ
Термические превращения состава и структуры гексагонального оксида молибдена
Журнал структурной химии. 2015. Т.56. №2. С.304-311. РИНЦ
Dates:
Submitted: | Dec 30, 2013 |
Published print: | Mar 1, 2015 |
Published online: | May 29, 2015 |
Identifiers:
Web of science | WOS:000355235600012 |
Scopus | 2-s2.0-84934872913 |
Elibrary | 23980700 |
Chemical Abstracts | 2015:918030 |
Chemical Abstracts (print) | 167:10848 |
OpenAlex | W2124921484 |