PbTiO3単結晶の育成

概要

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The phase diagram of PbO (massicot)-PbTiO3 system in PbO rich region was determined by X-ray diffraction and DTA measurement. On the basis of this diagram, single crystals of perovakite-type PLTiO3 were grown from the melt with PbO as flux. And it was also studied by using a mixture of PbO-H3BO3-PbTiO3. The following results were obtained. (1) PbTiO3 single crystals were tetragonal having the stoichiometric composition and the direction of the growth was [100]. (2) The largest PbTiO3 single crystals (5mm×5mm×1mm) were obtained from the melt with the composition of PbO : PbTiO3=(80-70):(20-30) by mole percent. (3) There was no difference in crystal size between the crystals obtained by the cooling rate of 25°C/hr and that of 50°C/hr from the melt at 1100°C. (4) The translucent or partial translucent PbTiO3 single crystals were grown by adding 10 mole percent boric acid to the mixture of PbO:PbTiO3=(80-70):(20-30). (5) In PLO-H3BO3-PbTiO3 system, the region of the composition for obtaining single crystals of PbTiO3 was 10≤PbTiO3≤35, 25≤PbO≤85 and 0≤H3BO3≤52 mole percent and the translucent or partial translucent single crystals were grown in the region of 10≤PbTiO3≤30, 25≤PbO≤45 and 44≤H3BO3≤52 mole percent.
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