PbWO_4晶体的热膨胀及坩埚下降技术生长晶体开裂分析

The Expansion and Analysis of the Cracking of PbW0_4 Crystal Grownby Bridgman Technology

本文报道了坩埚下降技术生长钨酸铅（PWO）晶体的热膨胀系数测量结果，讨论了热膨胀对晶体开裂的影响．同时探讨了克服晶体开裂的途径．由于生长时纵向温场效应以及（PWO）晶体大的热膨胀系数和它的显著的各向异性而引起的应变是导致晶体开裂的重要因素．

The thermal expansion coefficient of PWO crystals grown by Bridgman technology was measuredand its effects on the cracking of the crystals were discussed. The approach of overcoming the crack wasalso investigated. It was shown that the strains resulted from temperature distribution along the longitudeduring manufacture, and the large thermal expansion coefficient with tlie maked anisotropy of the crystalsare the important reason of the cracking.