Phase equilibria, charge transport, and mass transport in Sr 4Nb2O9-"M4Nb2O 9" (M = Cd, Cu, Ni, and Zn) systems / Pantyukhina M.I., Podkorytov A.L., Zhukovskii V.M. // Russian Journal of Inorganic Chemistry. - 2010. - V. 55, l. 1. - P. 103-111.

ISSN:

00360236

Type:

Article

Abstract:

Homogeneous fields of Sr4 - x M x Nb 2O9 (M = Cd, Cu, Ni, or Zn) solid solutions were determined using powder X-ray diffraction. Phase fields were plotted proceeding from the tolerance factor t and electronegativity ratio κ̄ A/κ̄B with a satisfactory fit of experimental results. Thermogravimetry was used to establish the major kinetic laws of solid-phase synthesis (conversion, rate-controlling stage, and effective activation energy) in (4 - x)SrCO3 + xMO + Nb2O 5 powdery mixtures. Direct radiometry was used to determine 90Sr, 63Ni, and 65Zn self-diffusion coefficients in solid solutions based on the Sr4Nb2O 9 phase. Electrical conductivity was measured as a function of temperature for all Sr4Nb2O9-"M 4Nb2O9" samples. The conductivity of Sr4 - x M x Nb2O9 (M = Cd, Cu, Ni, or Zn) solid solutions has a mixed ion-electron character. © 2010 Pleiades Publishing, Ltd.

Author keywords:

Index keywords:

Charge transport; Effective activation energy; Electrical conductivity; Homogeneous field; Kinetic law; Mass transport; Mixed-ion; Phase fields; Powder X ray diffraction; Rate-controlling; Self-diffus

DOI:

10.1134/S0036023610010201

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Affiliations	Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 22, Yekaterinburg 620219, Russian Federation; Chemical Department, Ural State University, pr. Lenina 51, Yekaterinburg 620083, Russian Federation
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Correspondence Address	Pantyukhina, M. I.; Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 22, Yekaterinburg 620219, Russian Federation; email: Pantyukhina@ihte.uran.ru
CODEN	RJICA
Language of Original Document	English
Abbreviated Source Title	Russ. J. Inorg. Chem.
Source	Scopus