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Electrode materials Y 0.5 Ca 0.5 Mn 1x (ëÓ, Ni ) x é 3 ( x = 0-0.1) have an o' -orthorhombic perovskite structure. Doping with transition metals raises the content of ions Mn 4+ 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 ä -1 . Composition Y 0.5 Ca 0.5 Mn 1x (ëÓ, Ni ) x é 3 is n -type semiconductor with a considerable oxygen constituent at >1000 K. Effect of the electrode material composition on the resistance parameter ( ρ / d ) of an intermediate layer E/SE and on the polarization resistance ( R η ) of the triple-phase boundary E/SE/GP is similar. At 300-1100 K and 10 2 -10 5 Pa, minimum values of these quantities are exhibited by samples with the Y 0.5 Ca 0.5 Mn 0.95 Ni 0.05 é 3 electrode layer 50 mg cm -2 thick.
Structure and Physicochemical Properties of Y 2 Ba 1−x MxCuO 5 (M: Sr, Ca) Solid Solutions.-Crystal structure, thermal expansion, and electric conductivity of the title solid solutions Y 2 Ba 1−x MxCuO 5 (0≤x≤1) are studied in the temperature interval 293-1073 K. Solid solutions with M: Sr and M: Ca are formed by formal substitution of barium by strontium in the range 0≤x≤0.85 or by calcium in the range 0≤x≤0.8. These solid solutions possess the orthorhombic structure of the parent Y 2 BaCuO 5 phase (space group P4/nma; Z = 4). Their unit cell parameters as well as the thermal expansion coefficients decrease, while the electric conductivity increases with increasing Sr or Ca content. -(KLYNDYUK, A. I.; PETROV, G. S.; POLUYAN, A. F.; BASHKIROV, L. A.; Neorg. Mater. 35 (1999) 5, 616-620; Beloruss. gos. tekhnol. univ., Minsk 220630, Belarus; RU)
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