By the method of high-temperature reactions in solid phase, compounds with the general formula MⅡ(AⅢ2/3U1/3)O3(MⅡ=Sr, AⅢ=Sc, In;MⅡ=Ba, AⅢ=Sc, In, Y, Nd-Lu) were synthesized.Their structures(space groups Fm ...By the method of high-temperature reactions in solid phase, compounds with the general formula MⅡ(AⅢ2/3U1/3)O3(MⅡ=Sr, AⅢ=Sc, In;MⅡ=Ba, AⅢ=Sc, In, Y, Nd-Lu) were synthesized.Their structures(space groups Fm 3 m and Pnma) were refined by the Rietveld method and morphotropic transition in Ba(Ln2/3U1/3)O3 on the border of Gd-Tb was discovered.By means of high-temperature X-ray diffraction, phase transitions were studied and thermal expansion coefficients were determined.展开更多
文摘By the method of high-temperature reactions in solid phase, compounds with the general formula MⅡ(AⅢ2/3U1/3)O3(MⅡ=Sr, AⅢ=Sc, In;MⅡ=Ba, AⅢ=Sc, In, Y, Nd-Lu) were synthesized.Their structures(space groups Fm 3 m and Pnma) were refined by the Rietveld method and morphotropic transition in Ba(Ln2/3U1/3)O3 on the border of Gd-Tb was discovered.By means of high-temperature X-ray diffraction, phase transitions were studied and thermal expansion coefficients were determined.