This article is cited in 6 papers

Dielectrics

Investigation of phase transitions and thermal expansion of some complex tungsten-containing oxides

N. G. Chernorukov, A. V. Knyazev, N. Yu. Kuznetsova, I. V. Ladenkov

Lobachevsky State University of Nizhny Novgorod

Abstract: The phase transitions have been investigated and the thermal expansion coefficients have been determined in compounds with a structure of brannerite, defect pyrochlore, and tungsten bronze of the general formula $M^IA^V$WO$_{6-\delta}$ ($M^I$ – $\square$, H$_3$O, Li, Na, K, Rb, and Cs; $A^V$ – V, Nb, Sb, and Ta; $\delta$ = 0,0.5) by high-temperature X-ray diffraction and differential thermal analysis. It has been shown that brannerites and tungsten bronze do not undergo phase transitions and the compounds are characterized by a significant anisotropy of the thermal expansion, whereas pyrochlores undergo phase transitions of three types, and thermal deformations in them are determined by the size of $M^I$ atoms.

Received: 26.01.2010
Accepted: 24.05.2010

 English version: Physics of the Solid State, 2011, 53:2, 292–298

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