| Binary System MnO-Nb_2O_5 |
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| 作者姓名： | 韩海鸥 林勤 魏寿昆 |
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| 作者单位： | University of Science and Technology Beijing 100083，China，University of Science and Technology Beijing，100083，China，University of Science and Technology Beijing，100083，China |
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| 摘 要： | The phase diagram of the binary systemMnO-Nb_2O_5 was studied by means of the differentialthermal analysis(DTA),X-ray diffraction analysis andscanning electron microscopy(SEM).Thermodynamic da-ta of the new compounds 4MnO·Nb_2O_5 andMnO·Nb_2O_5were found as follows:4MnO·Nb_2O_5:t_m=1398±2℃△H_m=129000(J/mol)△S_m=77(J/mol,K)△G_m~o=129000-77T(J/mol)MnO·Nb_2O_5:t_m=1499±2℃△H_m=86940(J/mol)△S_m=49.6(J/mol,K)△G_m~o=86940-49.6T(J/mol)The eutectic parameters for the system are given below:t_(E1)=1383±3℃ N_(E1(MnO))=0.896t_(E2)=1312±2℃ N_(E2(MoO))=0.713t_(E3)=1400±4℃ N_(E3(MnO))=0.231
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| 收稿时间： | 1990-03-28 |
Binary System MnO-Nb_2O_5 |
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| HAN Haiou LIN Qin WEI Shoukun University of Science and Technology Beijing,China..Binary System MnO-Nb_2O_5[J].Journal of Materials Science & Technology,1990,6(2):98-102. |
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| Authors: | HAN Haiou LIN Qin WEI Shoukun University of Science and Technology Beijing China |
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| Abstract: | The phase diagram of the binary system MnO-Nb_2O_5 was studied by means of the differential thermal analysis(DTA),X-ray diffraction analysis and scanning electron microscopy(SEM).Thermodynamic da- ta of the new compounds 4MnO·Nb_2O_5 and MnO·Nb_2O_5were found as follows: 4MnO·Nb_2O_5:t_m=1398±2℃ △H_m=129000(J/mol) △S_m=77(J/mol,K) △G_m~o=129000-77T(J/mol) MnO·Nb_2O_5:t_m=1499±2℃ △H_m=86940(J/mol) △S_m=49.6(J/mol,K) △G_m~o=86940-49.6T(J/mol) The eutectic parameters for the system are given below: t_(E1)=1383±3℃ N_(E1(MnO))=0.896 t_(E2)=1312±2℃ N_(E2(MoO))=0.713 t_(E3)=1400±4℃ N_(E3(MnO))=0.231 |
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| Keywords: | phase diagram MnO-Nb_2O_5 system DTA |
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