その場観察・測定による酸化物結晶の成長機構解析 [in Japanese] Analysis on Crystal Growth Mechanism of Oxides by In-situ Observation Method [in Japanese]
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Growth mechanism of oxide crystals from a heterogeneous condition of solid-melt mixtures formed by incongruent melting has been analyzed using a newly developed in-situ observation system, which is composed of a time-resolving X-ray powder diffraction apparatus using a PSPC (Position Sensitive Proportional Counter) combined with an optical microscope, images of which are detected by a CCD sensor and stored into a video-recording system. Measurements are carried out on the oxide superconductor system Y-Ba-Cu-O, where well-habited single crystals of the superconductive compound YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> are easily obtained from a mixture of solid Y<SUB>2</SUB>BaCuO<SUB>5</SUB> and liquid with the aid of the peritectic reaction. The results indicate that recrystallization by Ostwald ripening plays a main role in such a heterogeneous condition and diffusion of YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>x</SUB> molecules in the liquid phase determines the whole growth rate.
- Journal of the Mineralogical Society of Japan
Journal of the Mineralogical Society of Japan 24(4), 253-258, 1995-10-01
Japan Association of Mineralogical Sciences