Physicochemical properties of electrode materials based on substituted yttrium manganite |
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Authors: | L. A. Tikhonova A. F. Poluyan A. N. Glushko A. A. Vecher D. V. Znosok |
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Affiliation: | (1) Minsk State Higher Radiotechnical College, pr. F. Skoriny 62, 220050 Minsk, Belarus;(2) Research Institute of Physicochemical Problems, Belarussian State University, ul. Leningradskaya 14, 220050 Minsk, Belarus |
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Abstract: | Electrode materials Y0.5Ca0.5Mn1–x(Co,Ni)xO3(x = 0–0.1) have an o-orthorhombic perovskite structure. Doping with transition metals raises the content of ions Mn4+ from 49% at x = 0 to 62% at x = 0.05 Ni. At 500–650 K there takes place an o-o-orthorhombic transition, with the thermal expansion coefficient rising from (7.1–8.1) × 10–6 to (10.5–11) × 10–6 K–1. Composition Y0.5Ca0.5Mn1–x(Co, Ni)xO3 is n-type semiconductor with a considerable oxygen constituent at >1000 K. Effect of the electrode material composition on the resistance parameter (/d) of an intermediate layer E/SE and on the polarization resistance (R) of the triple-phase boundary E/SE/GP is similar. At 300–1100 K and 102–105 Pa, minimum values of these quantities are exhibited by samples with the Y0.5Ca0.5Mn0.95Ni0.05O3 electrode layer 50 mg cm–2 thick.Translated from Elektrokhimiya, Vol. 41, No. 3, 2005, pp. 291–297.Original Russian Text Copyright © 2005 by Tikhonova, Poluyan, Glushko, Vecher, Znosok. |
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Keywords: | manganite yttrium electrode composition structure concentration ion temperature parameter resistance polarization |
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