Mechanical Properties and Anisotropy in PbWO4 Single Crystal

• 作者: 张志军 徐家跃 李培俊 王红 胡关钦 赵景泰
• 来源期刊: 中国物理快报(英文版)
• 学科: 工学
• 关键词: 钨酸铅晶体 力学性能 各向异性 垂直布里奇曼法 单晶 维氏硬度 断裂韧性 屈服强度
• 年，卷（期）: 2010,（2）
• 页码范围: 191-194
• 页数: 4页
• 分类号: TN304.053 O614.433
• 语种: 英文

摘要

The mechanical properties of PbWO4 (PWO) crystals grown by the vertical Bridgman method are systematically investigated using the microindentation technique. In the present work, the Vickers microhardness Hν, fracture toughness Kc, yield strength σy and friability index Bi of PbWO4 crystals are measured. The Vickers microhardness Hν on the (100) wafer is about 140 MPa, which means that PWO is a little soft'' scintillator. The anisotropy of mechanical properties is also investigated under a steady load of 0.5 kg. The (100) wafer of the crystal exhibits combined mechanical properties more excellent than those of (111) and (001) wafers, and the values of Kc, σy, and Bi are 0.538 MPa?m1/2, 51.11 kg/mm2 and 284.96 νm-1/2, respectively.