Piezoelectric and Elastic Properties of Single Crystalline Se-Te Alloys

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The piezoelectric constants, the electromechanical coupling factors and the elastic compliance constants of Se-Te alloys are studied by the transmission circuit method and/or the mechanical resonance method. The piezoelectric constants d_<11> and d_<14> decrease rapidly when the Te concentration increases within the range of 0〜25 at.% and then increase with the Te concentration up to 80 at.%. The values of d_<11> and d_<14> are 2.76・10^<-6> and 1.95・10^<-6> C.G.S. for pure Se and 3.1・10^<-6> (±10%) and 1.9・10^<-6> (±15%) C.G.S. for the alloy of 80 at.%, respectively. A similar tendency is observed in the electro mechanical coupling factors k_<11> and k_<14>, which are 0.250 and 0.156 for pure Se and 0.25 (±10%) and 0.17 (±15%) for the alloy of 80at.%, respectively. All elastic compliance constants do not change linearly with the Te concentration within the range of 0〜30 at.%, but at higher Te concentration they change almost linearly with the concentration.
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1972-04-05