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Potentiometric Determination of the Gibbs Energies of Formation of SrZrO_3 and BaZrO_3

机译:电位测定SrZrO_3和BaZrO_3形成的吉布斯能

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The Gibbs free energies of formation of strontium and barium zirconates have been determined in the temperature range 960 to 1210 K using electrochemical cells incorporating the respective alkaline-earth fluoride single crystals as solid electrolytes. Pure strontium and barium monoxides were used in the reference electrodes. During measurements on barium zirconate, the oxygen partial pressure in the gas phase over the electrodes was maintained at a low value of 18.7 Pa to minimize the solubility of barium peroxide in the monoxide phase. Strontium zirconate was found to undergo a phase transition from orthorhombic perovskite (o) with space group Cmcm; D_(2h)~(17) to tetragonal perovskite (t) having the space group 14/mcm; D_(4h)~(18) at 1123 (± 10) K. Barium zirconate does not appear to undergo a phase transition in the temperature range of measurement. It has the cubic perovskite (c) structure.
机译:锶和锆酸钡的形成的吉布斯自由能已在960至1210 K的温度范围内使用结合了碱土金属氟化物单晶作为固体电解质的电化学电池进行了测定。在参比电极中使用纯一氧化锶和一氧化钡。在锆酸钡的测量过程中,电极上气相中的氧分压保持在18.7 Pa的较低值,以使过氧化钡在一氧化碳相中的溶解度最小。锆酸锶被发现与斜方钙钛矿(o)的空间相Cmcm发生相变。 D_(2h)〜(17)至具有空间群14 / mcm的四方钙钛矿(t);在1123(±10)K时D_(4h)〜(18)。锆酸钡在测量温度范围内似乎没有发生相变。它具有立方钙钛矿(c)结构。

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