NDLI: A study on La$_{2}$Mo$_{2}$O$_{9}$ decomposition process

Content Provider	Springer Nature Link
Author	Ruan, Bei Yan, Baijun Zhang, Jiayun
Copyright Year	2012
Abstract	The present paper reports the first stage of the study by the present group on the thermal decomposition of La$_{2}$Mo$_{2}$O$_{9}$ under lower oxygen partial pressure. The stability of La$_{2}$Mo$_{2}$O$_{9}$ at 1473 K in an oxygen partial pressure $$ (p_{{{\rm O}_{2} }} ) $$ ranges from 2.44 × 10$^{−5}$ to 4.33 × 10$^{−9}$ Pa was studied by XRD. The results showed that La$_{2}$Mo$_{2}$O$_{9}$ could remain stable in a $$ p_{{{\rm O}_{2} }} $$ range greater than 2.44 × 10$^{−5 }$Pa. While below this $$ p_{{{\rm O}_{2} }} $$ , the formation of several reduced and crystallized molybdates were found. By means of XRD, TEM, SAED, and EDS, the decomposition process of La$_{2}$Mo$_{2}$O$_{9}$ at 1473 K under $$ p_{{{\rm O}_{2} }} $$ of 9.75 × 10$^{−7 }$Pa was investigated. The intermediate and final products formed during the thermal decomposition were characterized. It was found that the La$_{2}$Mo$_{2}$O$_{9}$ decomposition consisted of two steps. La$_{2}$Mo$_{2}$O$_{9}$ first decomposed to intermediate products like LaMo$_{2}$O$_{5}$, La$_{5}$Mo$_{4}$O$_{14}$, and La$_{12}$Mo$_{6}$O$_{35}$ and then to final products like La$_{5}$Mo$_{3}$O$_{16}$ and a new Mo-rich compound. Tilt series of SAED patterns of this new structure were recorded. These measurements were used for the reconstruction of the reciprocal space. The cell attained was monoclinic with parameters: a ≈ 1.195 nm, b ≈ 4.133 nm, c ≈ 1.314 nm, and β ≈ 95°.
Starting Page	1186
Ending Page	1195
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	48
Issue Number	3
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2012-09-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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