亚稳碘化汞(β-HgI2M)晶体生长与相变.pdf

第32卷第7期
无机化学学报
Vol32 No.7
2016年7月
CHINESE J JOURNAL OF INORGANIC CHEMISTRY
1135-1140
亚稳碘化汞(B-HgI2)晶体生长与相变
许岗*1李俊英1谷智2南瑞华1冯亚西
(西安工业大学材料与化工学院,西安710021)
西北工业大学凝固技术国家重点实验室,西安710072)
摘要:采用溶液法,以aHg2为原料,在DMSO和H1O混合溶剂中生长了B-HgJ2"晶体。通过XRD检测了体的结构特征,利
用偏光显徽镜研究了晶体生长的动态过程及B-Hg12ar-Hg2的相变过程。研究表明,生长的晶体为B-HgJ2,空间结构为
Cmc2;晶体生长界面夹角为6502°,与B-HgI2单胞中(10和(10夹角65.16°)吻合;B-HgN→a-Hgl2相变为结构重构的一级
相变。
关键词:碘化汞;亚稳态晶体;晶体生长;晶体结构;相变
中图分类号:0614.243
文献标识码:A
文章编号:1001-4861(2016)07-1135-06
DOI:10.11862/CJIC.2016.158
Growth and Phase Transformation of Metastable B-hgl2m
XU Gang LI Jun-ying GU Zhi NAN Rui-hua! FENG Ya-xil
School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China)
(State Key Laboratory of Solidification Processing, North western Polytechnical Universi, Xi'an 710072, China)
Abstract: Growth of: -Hgl was successfully carried out in DMSO/H20 mix-solution at room temperature. XRD
analysis was used to characterize the structure of the as-grown crystal, Successive crystal growth of and
hase transformation, -Hg l -*a-hgl2, was recorded by micropolariscope. The results show that -Hg12 belongs to
Cmc2 space group, and the included angle of(1 10)and(110)during growth course of 3-H l is 65.029, which is
coincidence with 65.16 in unit cell of -gl Moreover, its crystallizing morphology is controlled by crystal
structure of -Hg1. Phase transformation of 8-hg12- a-hgl2 is the first-order transition of structure
reconstruction
Keywords: mercuric iodide; metastable crystal; crystal growth; crystal structure; phase transformation
0引言
在核辐射探测,医学成像,士壤环境检测測等领域有
着广泛的研究和应用叫;橘色相有l4/omnd,P4yme
碘化汞(Hgの是一种重要的直接带隙Ⅱ~Ⅶ族化和14Ad三种复杂结构,均由Hg超晶格构
合物半导体。无论溶液法还是气相法生长,碘化汞成?。橘色结枃通常出现在溶液法生长-Hg2的过
都会经历亚稳黄色B-HgJM:亚稳态)、亚稳橘色、程中,而且很不稳定,容易发生向c-Hg的相变。B-
红色a-Hg和黄色B-Hg2HT:高温)4种晶形。a-Hgl2品体空间群为Cmc2,有两种结构:低温存在
Hg2是室温稳定相,属四方结构,空间群P4nme,的B-Hg为正交晶系,是碘化汞晶体形成过程中
收稿日期:2016-03-07。收修改稿日期:2016-05-18
国家自然科学基金(No.51502234,11414251)、陕西省教育厅科研计划项目(N154?和西安工业大学省级重点实验室开放基金
No. ZSKJ201414资助。
*通信联系人。E-meil:xxrshhuangshan@126.com