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Ceramics-Silikáty 21, (2) 111 - 116 (1977) |
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MEASUREMENT OF THE TEMPERATURE DEPENDENCE OF ENTHALPY INCREASES OF CRYSTALLINE GADOLINIUM GERMANATE
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Bondar Irinaida A. 1, Petrova Maja A. 1, Eliášová Mária 2,
Proks Ivo 2
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1 Institut Khimii Silikatov im. I. V. Grebenshchikova AN SSSR, 199164, Leningrad, nab. Makarova 2
2 Institute of Inorganic Chemistry, Slovak Academy of Sciences, 809 34 Bratislava, Dúbravská cesta 5
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The temperature dependence of the enthalpy increases was determined for crystalline Gd₂O₃. GeO₂ at temperatures between 1273 – 1873 K and at 298 K. Gadoliniuim oxyorthogermanate Gd₂O₃. GeO₂ was prepared by solid-state synthesis at 1673 K in a PtRh resistance furnace. On the basis of the measured temperature dependence ΔHc,T the isobaric temperature dependence of molar heats was established over the above temperature interval: Cp,c,T = 1.694 x 10-1 + 3.5890 x 10-5T [kJmol-1K-1]. A drop calorimeter was used for the measurements. |
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