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Analysis of structural and magnetic phase transition behaviors of La1−x Sr x CrO3 by measurement of heat capacity with thermal relaxation technique

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Title: Analysis of structural and magnetic phase transition behaviors of La1−x Sr x CrO3 by measurement of heat capacity with thermal relaxation technique
Authors: Matsunaga, Yuhta1, Kawaji, Hitoshi2, Atake, Tooru2, Takahashi, Hiroki3, Hashimoto, Takuya1 takuya@chs.nihon-u.ac.jp
Source: Thermochimica Acta. Aug2008, Vol. 474 Issue 1/2, p57-61. 5p.
Subjects: Heat, Temperature, Calorimetry, Enthalpy
Abstract: Abstract: The heat capacity, C p , of the La1−x Sr x CrO3 system and its temperature dependence have been measured by a thermal relaxation technique. Both structural and magnetic phase transitions were detected at temperatures that can be surmised from the phase diagram proposed in previous studies. The observed variation in enthalpy after the first-order structural phase transition, ΔH, showed agreement with those measured by differential scanning calorimetry (DSC). A decrease in the variation in C p in the second-order magnetic phase transition, ΔC p , with an increase in Sr content was detected, which can be attributed to a decrease in electronic spin configuration entropy with an increase in Sr content. In the dependence of ΔC p on Sr content, a bending point was also observed at x ∼0.12, at which the crystal system varies from an orthorhombic-distorted perovskite structure to a rhombohedral-distorted perovskite structure. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: The heat capacity, C p , of the La1−x Sr x CrO3 system and its temperature dependence have been measured by a thermal relaxation technique. Both structural and magnetic phase transitions were detected at temperatures that can be surmised from the phase diagram proposed in previous studies. The observed variation in enthalpy after the first-order structural phase transition, ΔH, showed agreement with those measured by differential scanning calorimetry (DSC). A decrease in the variation in C p in the second-order magnetic phase transition, ΔC p , with an increase in Sr content was detected, which can be attributed to a decrease in electronic spin configuration entropy with an increase in Sr content. In the dependence of ΔC p on Sr content, a bending point was also observed at x ∼0.12, at which the crystal system varies from an orthorhombic-distorted perovskite structure to a rhombohedral-distorted perovskite structure. [Copyright &y& Elsevier]
ISSN:00406031
DOI:10.1016/j.tca.2008.06.005