PHASE-RELATIONS AND SOME ELECTRICAL-PROPERTIES OF COMPOUNDS IN TIS2-NBS2 SYSTEM

The phase relations of the TiS2-NbS2 system have been studied in the t emperature range from 500 to 1100 degrees C. Three polytypes, 1T, 2H(a ), and 3R, are observed. The IT-polytype is a high temperature phase, the 2H(a)-polytype is a medium temperature phase, and the 3R-polytype is a low temperature phase. The IT-polytype spreads over almost the wh ole composition range of the system. The 2H(a)-polytype has a very nar row homogeneity range around 100% NbS2. The 3R-polytype is stable in t he composition range between 100% and 96% NbS2. The electrical resisti vity has been measured from 30 to 300 K. The magnetic susceptibility h as been measured from 5 to 300 K. The samples of the 1T-Ti1-xNbxS2 (X less than or equal to 0.90) show the semiconductive behavior caused by an impurity scattering mechanism. (C) 1997 Elsevier Science Ltd.