Hall Effect of the Solid Solution ofTiC_xN_<1-x> and Ti_xV_<1-x>C

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In a previous paper^<1)>, we have measured the Hall effect of some transition metal momcarbides and found that the carbides of the fourth group transition metals with eight valence electrons have the conduction electron much less than one per chemical formula, whereas those of the fifth group with nine valence electrons have about one conduction electron. These results have been semiquantitatively intterpreted in terms of the band scheme proposed by Bilz^<2)>; the nonconductive band having the capacity of eight electrons slightly overlaps with the conductive band. Therefore, in the fourth group carbides, almost all the electrons belong to the nonconductive band, whereas in the fifth group carbides, we may exnect that the Valence electron with the highest energy overflows into the conduction band so that the carrier density turns to be about one per chemical formula. In order to develop this considereation, the Hall coefficients were measured on the two types of solid solutions, i.e. TiC-TiN and TiC-VC. The powder of titanium nitride was prepared in an electric furnace at about 1100℃ for 50-80 hours flowing NH_3 gas continuously on the metal powder. Titanium carbide and vanadium carbide are the same powders as used in. the previous work^<1)>. To obtain the solid solutions, the individual powders were mixed thoroughly in a desired proportion, and then they were sintered at about 1900℃ under the pressure of 50kg/cm^2 for about 30 minutes in a high frequency induction furnace. The lattice constants of the samples thus prepared agreed well with Vegard's law.
社団法人日本物理学会の論文
1964-01-05

Hall Effect of the Solid Solution ofTiC_xN_<1-x> and Ti_xV_<1-x>C

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