1 Experimental 1.1 Chemicals The chemical LiCl was of analytical reagent grade and dried in the same way as in Ref.[2]and Ref.[3. LaCls.7H2O with high purity were used.According to the mechanism of dehydration of LaCls7H2O and CeCl,7H2Ot4),they were dehydrated under the dry HCl atmosphere which pressure was less than 1 atm (101kPa)by slow heating to the following temperatures and kept at these temperatures for 5h each: 80°C,130°C,185°C,300°Cand80C,125°C,145°C,200°C,300°C,respectively· 1.2 Data Measurements Melting points and phase transition temperatures were measured by differential thermal analysis technique.A 100 mg sample of the required composition of LiCl and ReCla was weighted out into a clean,dry quartz crucible in a high purity nitrogen atmosphere.Then the quartz crucible was sealed and the sample was melted.After cooling,the samples were annealed at 350C for 12h. The DTA measurements were carried out on heating or cooling in purified nitrogen atmosphere using a NiCr-NiSi thermocouple and a-Al2Os powder as reference material.The DTA temperatures were calibrated using the following solid-solid or solid-liquid transition points:KNO3 (334C),Zn (419.7C),SiOz (573°C),KzS04(583°C),NaC1(801°C).In order to avoid the effect of supercooling up on the measured accuracy the heating curves were generally used to determine the liquidus temperatures.Typical heating rate was 10C/min. The onset of the DTA peak was used as the phase transition temperature. 2 Measured Results 2.1 Melting Points of Pure Components The measured melting point of LiCl was 610C,which agreed very well with Ref5).The obtained melting point of CeCls was 815+3C which was in agree- ment with Ref.5],but a little higher than the reported value in Ref.1).The melting points of LaCls gived in Ref.5]and Ref.C6]are 855C and 850C which are by 20C and 25C lower than that found recently in Ref.7]and Ref.C8]. The reason suggested in Ref.9]was due to impurities of the LaCla.We paid much attention to purities and dehydration of the LaCis and measured several times.The melting point of LaCla was found to be 8753C which agreed very well with that reported in Ref.[7-9]. 599三 。 卜 · 〔 〕 〔 〕 。 · 了 · ， 饰 主 ， ‘ “ ， “ ， 企 “ ， “ ， ， “ ， “ ， ， “ ， 、 。 一 。 ， 。 任 ， · 一 一 一 一 一 “ ， ， “ ， 声 ， “ 。 立 “ · 电气 、 “ ， 立 〔 〕 · 士 “ 〔 〕 ， 〔 〕 。 。 〔 〕 〔 〕 “ “ “ 〔 〕 〔 〕 。 〔 〕 士 “ 了 · 〔 一 〕