A_<1-x>Ti_<2+x>M_<5-x>O_<12>(A=Na, K, M=Al,Ga)のウイスカーの合成

概要

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Whiskers of A_<1-x>Ti_<2+x>M_<5-x>O_12(A=Na, K and M=Al, Ga) were grown by the flux method. Na_<l-x>Ti_<2+x>Al_<5- x >O_<12> whiskers were obtained by slow-cooling from a melt at 1300℃ using a mixture of 30 mol% of a crystal composition of (Na_2O)_1(TiO_2)_1(Al_2O_3)_1 and 70 mol% of a flux composition of (Na_2O)_1(MO_O_3)_<1.5>. K_<l-x>Ti_<2+x>Ga_<5-x>O_12 whiskers were also obtained in the same growth technique using a mixture consisting of 30-40 mol% of a crystal composition of (K_2O)_1(TiO_2)_1(Ga_2O_3)_1 and of 60-70 mol% of a flux composition of (K_2O)_1 (M_OO_3)_<1.5>. The x value in general formula was 0.2 from chemical analysis. The A ions are mobile by the existence of vacancy site. These whiskers showed very high ionic conductivities of 2.0-3.0 S・cm^<-1> at 300 K and 32.5 GHz.
社団法人日本セラミックス協会の論文
1990-10-01