Heat capacity of GdBiGeO5 in the temperature range 373–1000 K

Денисова, Л. Т.; Изотов, А. Д.; Kargin, Yu. F.; Денисов, В. М.; Галиахметова, Н. А.

doi:10.1134/s0012501617040029

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…The relationship between heat capacity and temperature is as follows − C normalP = A + B · 10 − 3 · T + C · 10 5 · T − 2 + D · 10 − 6 · T 2 In the formula, A , B , C , and D are constants obtained by regression of experimental data, which could be searched according to experimental conditions. For the same substance under the same reaction conditions, the values of A , B , C , and D in eqs , 6, and are the same.…”

Section: Models and Methodsmentioning

confidence: 99%

Thermodynamic Analysis on In Situ Underground Pyrolysis of Tar-Rich Coal: Secondary Reactions

Gao

et al. 2023

ACS Omega

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To develop the in situ underground pyrolysis process of tar-rich coal more scientifically, the effect of temperature and pressure on the distribution of pyrolysis products should be clarified. This paper selected the typical components in five distillates of light tar, phenol tar, naphthalene tar, washing tar, and anthracene tar as the main reaction products. 32 typical secondary reactions were constructed. Based on the thermodynamic analysis strategy, the variation of the Gibbs free energy and equilibrium constant of secondary reactions was investigated. The results showed that pressure mainly affected the reaction characteristics of molecule-increasing reactions. The Gibbs free energy value of the molecule-increasing reactions increased with increasing pressure. The trend that the reaction could proceed spontaneously gradually weakened. The initial temperature of some reactions that could proceed spontaneously would need to increase by dozens or even hundreds of degrees. Due to the influence of formation pressure, the generation of related components of light tar, naphthalene tar, washing tar, and anthracene tar would be inhibited to varying degrees in the in situ underground pyrolysis process. The secondary reactions related to phenol tar were equimolecular reactions, which were almost unaffected by stratal pressure. Axial pressure and confining pressure of different coal seam depths should be considered in the process of in situ underground pyrolysis.

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Section: Models and Methodsmentioning

confidence: 99%

Thermodynamic Analysis on In Situ Underground Pyrolysis of Tar-Rich Coal: Secondary Reactions

Gao

et al. 2023

ACS Omega

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High-Temperature Heat Capacity and Thermodynamic Properties of HoBiGeO5 and ErBiGeO5

et al. 2018

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Поступила в редакцию Твердофазным синтезом из стехиометрических смесей Ho 2 O 3 (Er 2 O 3), Bi 2 O 3 и GeO 2 получены соединения HoBiGeO 5 и ErBiGeO 5. Методом дифференциальной сканирующей калориметрии исследовано влияние температуры на теплоемкость полученных соединений в интервале 350-1000 K. По экспериментальным данным C p = f(T) рассчитаны термодинамические функции (изменения энтальпии, энтропии и приведенной энергии Гиббса) тройных оксидов. Ключевые слова: твердофазный синтез, германаты висмута гольмия и висмута эрбия, высокотемпературная теплоемкость, термодинамические свойства. ВВЕДЕНИЕ В работах [1-4] приведены данные о получении сложных оксидных соединений с общей формулой R x Bi 2-x GeO 5

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