论文部分内容阅读
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
The phase diagram of the binary system MnO-Nb 2 O 5 was studied by means of the differentialthermal 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 2 O 5: t_m = 1398 ± 2 ° C ΔH_m = 129000 (J / mol) ΔS_m = 77 (J / mol, K) ΔG_m~o = 129000-77T (J / mol) MnO.Nb_2O_5: t_m = 1499 ± 2 ° C ΔH_m = 86940 (J / mol) ΔS_m = 49.6 (J / mol, K) ΔG_m ~ o = 86940-49.6T (J / mol) The eutectic parameters for the system are given below: E1) = 1383 ± 3 ° C N_ (E1 (MnO)) = 0.896 t_E2 = 1312 ± 2 ° C N E2 MoO = 0.713 t_E3 = 1400 ± 4 ° C N_E3 (MnO) = 0.231