The phase diagrams of the binary systems RECl<sub>3</sub>-MCl<sub>n</sub>（M=Li,Mg,Ca,Pb;n=1 or 2）were investigated bymeans of DTA and X-ray diffraction analysis.It was found that they are of ...The phase diagrams of the binary systems RECl<sub>3</sub>-MCl<sub>n</sub>（M=Li,Mg,Ca,Pb;n=1 or 2）were investigated bymeans of DTA and X-ray diffraction analysis.It was found that they are of simple eutectic type with eutectic points50.1 Mol.-% TBCl<sub>3</sub>（445℃）,67.5Mol.-% TbCl<sub>3</sub>（589℃）,65.9Mol.-% TbCl<sub>563℃</sub>and 35.6 Mol.-%TbCl<sub>3</sub>（445℃）respectively.Unstable compounds,formed in the solid slate,are MgTbCl<sub>7</sub>,CaTb<sub>2</sub>Cl<sub>8</sub>,LiTb<sub>2</sub>Cl<sub>7</sub> andPbTbCl<sub>5</sub>.Their decomposition temperatures are 388℃ with a phase transition at 352,500 and 521℃ with a phasetransition at 483 and 405℃ respectively.Some rules of the phase diagrams were explored.展开更多
基金Project financially supported by the National Natural Science Foundation of ChinaManuseript received,Sept.21,1992
文摘The phase diagrams of the binary systems RECl<sub>3</sub>-MCl<sub>n</sub>（M=Li,Mg,Ca,Pb;n=1 or 2）were investigated bymeans of DTA and X-ray diffraction analysis.It was found that they are of simple eutectic type with eutectic points50.1 Mol.-% TBCl<sub>3</sub>（445℃）,67.5Mol.-% TbCl<sub>3</sub>（589℃）,65.9Mol.-% TbCl<sub>563℃</sub>and 35.6 Mol.-%TbCl<sub>3</sub>（445℃）respectively.Unstable compounds,formed in the solid slate,are MgTbCl<sub>7</sub>,CaTb<sub>2</sub>Cl<sub>8</sub>,LiTb<sub>2</sub>Cl<sub>7</sub> andPbTbCl<sub>5</sub>.Their decomposition temperatures are 388℃ with a phase transition at 352,500 and 521℃ with a phasetransition at 483 and 405℃ respectively.Some rules of the phase diagrams were explored.
