利用光学显微镜和电子探针研究了存在于钨酸铅晶体中的生长层,确定这些生长层的成分为固体的铂金颗粒.根据对PbO和WO3原料所做的GDMS分析结果,排除了这些铂金颗粒来自原料的可能性,而是认为它们来自生长晶体所用的铂金坩埚.并在此基础上提出,PbO-WO3熔体在高温下对铂金坩埚的熔蚀和溶解为生长层的形成提供了物质基础,但由于停电、停降或温度波动而导致固液界面的暂时静止则为熔体中铂金的析出和沉降提供了机会和场所.为抑制生长层的出现,建议在生长过程中适当降低液相区的温度或适当缩短晶体的生长周期.
参考文献
| [1] | Kroge F A.Some Aspects of the Luminescence of Solids.Chapter Ⅲ[M].Amsterdam:Elaevier,1948:194. |
| [2] | Derenzo S.E.;Moses W.W. .Prospects for new inorganic scintillators[J].IEEE Transactions on Nuclear Science,1990(2):203-208. |
| [3] | Woody C.L.;Kierstead J.A. .A study of the optical and radiation damage properties of lead tungstate crystals[J].IEEE Transactions on Nuclear Science,1996(3):1585-1589. |
| [4] | Egidio Longo .PbWO4 Calorimeter in CMS[J].Nuclear Instruments and Methods in Physics Research B:Beam Interaction with Materials and Atoms,1996,384:225-229. |
| [5] | Senguttuvan N.;Babu SM.;Mohan P. .Czochralski growth of lead tungstate single crystals and their characterization[J].Journal of Crystal Growth,1998(3):391-397. |
| [6] | Nassau K;Broyer A M .Calcium Tungstate,Czochralski Growth Perfection and Substitution[J].Journal of Applied Physics,1962,33:3064. |
| [7] | Born P J .The Preparation and Scintillation Properties of Zinc Tungstate (ZnWO4) Single Crystals[J].Journal of Luminescence,1981,24-25:131. |
| [8] | 徐军.闪烁晶体CdWO4的生长[J].人工晶体学报,1990(04):283. |
| [9] | Brixner L H .Single Crystal Growth of the Ln(MO4)3-type Earth Molybdates[J].Journal of Crystal Growth,1973,18:297. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%