ドープしたPrGaO_3ペロブスカイト型酸化物の電気伝導特性

概要

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Alkaline earth cation doped PrGaO_3 dense ceramics, Pr_<1-x>M_xGa_<1-y>Mg_yO_<3-δ> (M = Ca, Sr, and Ba), were synthesized by using a solid-state reaction method, and their total conductivity was measured under different kinds of atmospheres. The optimum dopant for the enhancement of conductivity was Sr for the Pr site, and Pr_<0.9>Sr_<0.1>Ga_<0.85>O<3-δ> (PSGM) showed higher electrical conductivity than other systems. From the total electrical conductivity values measured in Ar and O_2, it is strongly suggested that p-type electronic conduction is dominant in all of the doped PrGaO_3 system. The difference between the conductivity in O_2 and that in Ar was the largest in Pr_<0.9>Ga_<0.1>Ga_<0.85>Mg_<0.15>O<3-δ> (PCGM) and the smallest in PSGM. To examine whether proton conduction occurs in Pr_<1-x>Ca_xGa_<1-y>Mg_yO_<3-δ> system, the total electrical conductivity in Pr_<0.93>Ca_<0.07>Ga_<0.85>Mg_<0.15>O_<3-δ> was measured by changing the partial pressure of O_2 and H_2O (or D_2O) in the atmosphere. The results indicate that Pr_<0.93>Ca_<0.07>Ga_<0.85>Mg_<0.15>O_<3-δ> predominantly shows hole conduction below 873 K, and proton conductivity is negligibly small.
社団法人日本セラミックス協会の論文
2004-07-01