Structure, non-stoichiometry and thermodynamic properties of Bi1.85Sr2Co1.85O7.7-δ ceramics

被引：22

作者：

Jankovsky, O. ^{[1
]}

Sedmidubsky, D. ^{[1
]}

Rubesova, K. ^{[1
]}

Sofer, Z. ^{[1
]}

Leitner, J. ^{[2
]}

Ruzicka, K. ^{[3
]}

Svoboda, P. ^{[4
]}

机构：

[1] Prague Inst Chem Technol, Dept Inorgan Chem, Prague 16628, Czech Republic

[2] Prague Inst Chem Technol, Dept Solid State Engn, Prague 16628, Czech Republic

[3] Prague Inst Chem Technol, Dept Phys Chem, Prague 16628, Czech Republic

[4] Charles Univ Prague, Dept Condensed Matter Phys, Prague 12116 2, Czech Republic

来源：

THERMOCHIMICA ACTA | 2014年 / 582卷

关键词：

Misfit cobaltites; Thermoelectric materials; Heat capacity; Debye-Einstein model; THERMOELECTRIC PROPERTIES; HEAT-CAPACITY; COBALTITE; CO; ENTHALPY; ENTROPY;

D O I：

10.1016/j.tca.2014.02.022

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The structure and oxygen non-stoichiometry of misfit layered cobaltite Ei(1.85)Sr(2)Co(1.85)O(7.7-delta) was determined by Rietveld analysis and by thermogravimetric measurements. The heat capacity and enthalpy increments of pseudo-ternary oxide Ei(1.85)Sr(2)Co(1.85)O(7.7-delta) was measured by the relaxation time method (PPMS) from 2 K to 256 K, by differential scanning calorimetry (DSC) from 258 K to 355 K and by the drop calorimetry from 573 K to 1153 K. Above room temperature the temperature dependence of the molar heat capacity in the form C-pm = (305.8 + 0.07325 . T - 4702536 T-2)J K-1 mol(-1) was derived by the least-squares method from the experimental data. The heat capacity was analyzed in terms of a combined Debye-Einstein model. The molar entropy S-m(o)(298.15) = 317.7J mol(-1) K-1 was evaluated from the low temperature heat capacity measurements. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：40 / 45

页数：6

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