フラックス徐冷法によるRuイオンを固溶したPbTiO_3結晶の育成と焦電的性質

概要

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Ruthnium-doped PbTiO_3{(1-x)PbTiO_3+xRuO_2, x=0-0.018, (PRT)}twin crystals were grown by the flux cooling method. The pyroelectric properties of the poled PRT crystals with x=0.005-0.009 were measured. The addition of RuO_2 markedly affected the crystal size and reduced the crystal imperfections of PbTiO_3. Based on observations by scanning electron microscopy and the back-reflection Laue method, black platelike crystals with x=0.009 in particular exhibited excellent crystallinity. Based on the results of identification and chemical analysis and measurement of pyroelectric properties, the limit of substitutional solubility of Ru^<4+> ions for Ti in PbTiO_3 was estimated to be in th vicinity of 1.1 mol%. The figures of merit F.M.for voltage responsivity of pyroelectric IR sensors were satisfactory for samples with x=0.005-0.009; in particular, the sample with x=0.009 showed the highest F.M.of around 5.5×10^<-11>C・cm/J, which is nearly equal to those of {(1-x)PbTiO_3+xMgO, x=0.045, (PMT)}single crystals. Judging from the measurement of pyroelectric properties of the PRT crystals, crystals with x=0.009 are suitable as element materials for point-type pyroelectric IR sensors.
社団法人日本セラミックス協会の論文
1995-11-01