Abstract
The polycrystalline disks of BeS, MgS, CaS and SrS in group IIa and Sc2S3 and Y2S3 in group IIIa were carefully prepared to avoid contamination. The electrical conductivities of the disks have been measured under the atmosphere of the various sulfur pressures by the two wire AC method (1 KHz).All sulfides of IIa metals showed ionic conduction The apparent activation energies for the ionic conduction were compared with those of other alkaline-earth oxides and sulfides, and the charge carriers of the sulfides predominant in ionic conduction are estimated as metal cations. A p-type electronic conduction linearly dependent on PS21⁄6 is observed for MgS and BeS in the high sulfur partial pressure range. The observed sulfur pressure dependence is attributed to the predominance of fully ionized magnesium and beryllium vacancies. An n-type conduction is observed for Sc2S3 and Y2S3 with partly proportional to PS2−3⁄16. The sulfur pressure dependence is attributed to the predominance of ionized scandium and yttrium interstitial ions. The electrical conductivity of Y2S3 showed PS23⁄16 dependence in the PS2 range indicator p-type conduction. This dependence is attributed to the fully ionized yttrium vacancies.
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