Thermodynamic stability, oxygen content, defect structure and related properties of YBaCo4 − xZnxO7 + δ (x = 0–3) oxides / Tsvetkov D.S., Tsvetkova N.S., Ivanov I.L., Zuev A.Y. // Solid State Ionics. - 2017. - V. 309, l. . - P. 92-99.

ISSN:

01672738

Type:

Article

Abstract:

Oxygen nonstoichiometry and thermodynamic stability of Zn–doped YBaCo4 − xZnxO7 + δ oxides were investigated by solid state coulometric titration and EMF-method, respectively. As a result, significant zinc doping was shown to increase the stability of YBaCo4 − xZnxO7 + δ oxides in oxidizing atmosphere. However enrichment of YBaCo4 − xZnxO7 + δ oxides by zinc results in increasing their reducibility since the low pO2 stability limit shifts towards higher pO2 values upon doping. Substitution of zinc for cobalt in YBaCo4 − xZnxO7 + δ oxides was also found to narrow their oxygen homogeneity region. Total conductivity and Seebeck coefficient of YBaCo4 − xZnxO7 + δ oxides were measured simultaneously using 4-probe dc-method. The defect structure of YBaCo4 − xZnxO7 + δ oxides was successfully analysed using Kröger-Vink approach. The data on oxygen nonstoichiometry, total conductivity and Seebeck coefficient of the thermodynamically stable YBaCo4 − xZnxO7 + δ (x = 0, 1) oxides were found to be quite consistent with the proposed model of their defect structure. © 2017 Elsevier B.V.

Author keywords:

114; Defect structure; Oxygen content; Thermodynamic stability; YBaCo4O7

Index keywords:

Cobalt alloys; Defect structures; Defects; Oxygen; Seebeck coefficient; Stability; Ternary alloys; Thermodynamic stability; Thermodynamics; Titration; Yttrium alloys; Zinc; Homogeneity regions; Oxidiz

DOI:

10.1016/j.ssi.2017.07.014

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85025176180&doi=10.1016%2fj.ssi.2017.07.014&partnerID=40&md5=d3c4ad2d50bc22bbd96f72e067b79712

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-85025176180&doi=10.1016%2fj.ssi.2017.07.014&partnerID=40&md5=d3c4ad2d50bc22bbd96f72e067b79712
Affiliations	Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russian Federation
Author Keywords	114; Defect structure; Oxygen content; Thermodynamic stability; YBaCo4O7
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Correspondence Address	Tsvetkov, D.S.Lenin Av. 51, Russian Federation; email: Dmitry.Tsvetkov@urfu.ru
Publisher	Elsevier B.V.
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus