【摘 要】
：
Skeletal form of KNbO3 crystals growing in Li2B4O7 solvent was in-situ observed at 900C and it was found thatshallow depression started to develop on the surfac
【机 构】
：
Shanghai Institute of Ceram ics, Chinese Academy of Sciences, Shanghai 200050, China;National Space
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Skeletal form of KNbO3 crystals growing in Li2B4O7 solvent was in-situ observed at 900C and it was found thatshallow depression started to develop on the surface of KNbO3 crystals when the crystal size exceeded several micron,typically 7 micron. Based on the quantitative criterion derived by Chov, the estimated critical size of KNbO3crystals was 1 micron, which was consistent with the experimental measurement. The kinetic coefficients, kc erand kc,, in the criterion were experimentally obtained in the diffusive-convective and diffusive-advective flow statesrespectively.
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