FZ法によるBa-Al-プリデライト及びK-Zn-プリデライト単結晶の育成とそのイオン伝導度

概要

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Large single crystals of Ba-Al-priderite (BATO) and K-Zn-priderite (KZTO) which are characterized by the one-dimensional tunnel structure with the hollandite type were grown by the floating zone (FZ) method. The chemical compositions, lattice parameters and melting temperatures of the obtained crystals are determined. BATO crystals melt congruently at 1510℃±10℃ with a-Ba_<1.18> Al_<2.36> Ti_<5.54> 0_<16> composition and KZTO crystals at 1388°±℃10 with a K_<1.56> Zn_<9.75> Ti_<7.25> O_<16> composition. The frequency-dependence of complex ionic nductivitiesco for BATO and KZTO single crystals was measured at room temperature. The BATO indicates complex behavior of a mixed conduction. The electronic conduction is predominant below 100 Hz, but the ionic conduction; becomes gradually predominant above 100 Hz. The ac ionic conductivities of BATO and KZTO at 100 kHz are 9.2×10^<-4> ・S cm^<-1> and 2.4×10^<-3> ・S ^cm<-1>, respectively.
社団法人日本セラミックス協会の論文
1988-01-01