| Molar heat capacities of La2Mo2O9 and La1.9Sr0.1MO209-δ |
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| 作者姓名： | Baijun Yan Jianhua Liu Yunduo Dai Qifeng Shu Zhihua Ren |
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| 作者单位： | Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | This work was financially supported by the National Natural Science Foundation of China （No.50604002）. |
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| 摘 要： | The molar heat capacities of La2Mo209 and La1.9Sr0.1MO209-δ were obtained using the differential scanning calorimetry （DSC） technique in a temperature range from 298 to 1473 K. The DSC curve of La2Mo209 showed an endothermal peak around 834 K corresponding to a first-order monoclinic-cubic phase transition, and the enthalpy change accompanying this phase transition is 5.99 kJ/mol. No evident endothermal peak existed in the DSC curve of La1.9Sr0.1MO209-δ, but a broad thermal anomaly existed in its heat capacity curve at around 832 K. In addition, the heat capacity values of La2Mo209 and La1.9Sr0.1MO209-δ began to decrease at 1196 and 1330 K, respectively. The non-transitional heat capacity values of La2Mo209 and La1.9Sr0.1MO209-δ were formulated using multiple regression analysis in two temperature ranges.
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| 关 键 词： | 热容量 相位转移 La2M0209 La1.9Sr0.1MO209-δ 微分热量测定法 |
| 收稿时间： | 12 September 2006 |
| 修稿时间： | 2006-09-12 |
Molar heat capacities of La2Mo2O9 and La1.9Sr0.1Mo2O9-δ |
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| Baijun Yan Jianhua Liu Yunduo Dai Qifeng Shu Zhihua Ren.Molar heat capacities of La2Mo2O9 and La1.9Sr0.1Mo2O9-δ[J].Journal of University of Science and Technology Beijing,2007,14(5):395-398. |
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| Authors: | Baijun Yan Jianhua Liu Yunduo Dai Qifeng Shu Zhihua Ren |
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| Affiliation: | aMetallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The molar heat capacities of La2Mo2O9 and La1.9Sr0.1Mo2O9-δ were obtained using the differential scanning calorimetry (DSC) technique in a temperature range from 298 to 1473 K. The DSC curve of La2Mo2O9 showed an endothermal peak around 834 K corresponding to a first-order monoclinic-cubic phase transition, and the enthalpy change accompanying this phase transition is 5.99 kJ/mol. No evident endothermal peak existed in the DSC curve of La1.9Sr0.1Mo2O9-δ, but a broad thermal anomaly existed in its heat capacity curve at around 832 K. In addition, the heat capacity values of La2Mo2O9 and La1.9Sr0.1Mo2O9-δ began to decrease at 1196 and 1330 K, respectively. The non-transitional heat capacity values of La2Mo2O9 and La1.9Sr0.1Mo2O9-δ were formulated using multiple regression analysis in two temperature ranges. |
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| Keywords: | heat capacity phase transition La2Mo2O9 La1 9Sr0 1Mo2O9-δ DSC |
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