PbO－Bi_2O_3－B_2O_3－SiO_2系重金属氧化物玻璃的结构与光学性

Structure and Some Optical Properties of the Heavy-Metal Oxide Glass PbO-Bi_2O_3-B_2O_3-SiO_2

通过密度、可见光光谱、红外吸收光谱、Ｃｏ－６０辐照损伤试验及荧光光谱的测试，研究了ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２玻璃系的光学性能与结构．密度最高可达８．４６４ｇ／ｃｍ３其紫外吸收达截止波长随Ｐｂ２＋及Ｂｉ３＋含量升高而红移．玻璃熔化温度低达８５０℃．在ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３系玻璃中加人ＳｉＯ２可使玻璃结构更致密．室温下该系统玻璃在３６０ｎｍ有一个宽的激发峰，能产生４１８ｕｍ及４３８ｕｍ两个弱的发射峰．该系统玻璃的结构是由［ＳｉＯ４］４－、［ＢＯ３］３－、［ＢＯ４］５－、［ＰｂＯ４］６－及［ＢｉＯ６］９－构成．其中部分Ｐｂ２＋及Ｂｉ３＋以网络外体进入玻璃．

A series of PbO-Bi2O3-B2O3-SiO2 glass was prepared and the density, visible transmission, optical absorption edges, IR absorption spectra, Co-60 irradiation damage and scintillating property were measured.The density of high up to 8.464g/cm3 can be obtained, and the glass can resist 105 rad radiation damage.The maximum visible transmittance is nearly 80%. The cutoff wavelength of this system shifts towards long wavelength with the increasing amount of Ph2+ and Bi3+ content. The glass melting temperature can be as low as 850℃. The addition of SiO2 could make the network of PbO-Bi2O3-B2O3 glass system more dense. There are a broad excitation peak around 360um and two weak emission peaks around 418um and 438um at room temperature, respectively. The structure of this glass system is composed of [SiO4]4-,[BO3]3-, [BO4]5-, [PbO4]6- and [BiO6]9-. Both parts of Ph2+ and Bi3+ serve as network modifiers.