物理化学学报 >> 1987, Vol. 3 >> Issue (04): 395-400.doi: 10.3866/PKU.WHXB19870412

研究论文 上一篇    下一篇

ZnP2晶体合成机理研究

华伟民; 丁祖昌   

  1. 浙江大学物理系
  • 收稿日期:1986-04-26 修回日期:1986-11-14 发布日期:1987-08-15

SYNTHETIC MECHANISM RESEARCH FOR ZnP2 CRYSTAL

Hua Weimin; Ding Zuchang   

  1. Physics Department; Zhejiang University
  • Received:1986-04-26 Revised:1986-11-14 Published:1987-08-15

摘要: 在抽空密封石英管内放置元素锌和磷合成ZnP_2过程中, 仔细考察了不同升温程序的实验结果, 发现磷蒸汽压条件对于形成磷化物的性质相当重要, 在大于4大气压时会生成近100%黑色ZnP_2。用缩短合成时间,考察合成过程的中间产物, 以及用称量法、化学分析法和扫描电镜法对中间产物的分析, 提出了ZnP_2合成过程的主要机理。

Abstract: The experimental results at variant programs of raising temperature are care- fully examined during the synthetic process of ZnP_2 while P and Zn are located at the opposite ends of a sealed evacuated quartz tube. It is found that the phosphorus vapour pressure has an effect on zinc phosphorus formation. When the phosphorus vapour pressure is not high enough, Zn_3P_2 will be formed; When the phosphorus vapour pressure is high enough but lower than 4 atm., both red tetragonal ZnP_2 and black monoclinic ZnP_2 will be formed, and the content of blask ZnP_2 is tend to be increasing with the increment of the phosphorus vapour pressure. When the phosphorus vapour pressure is higher than 4 atm., almost 100% black ZnP_2 is formed.
The intermediate product is observed with short-time syhthesis method, and is identified by weight method, chemical analysis and SEM. We have proposed the main mechanism of ZnP_2 synthetic process. During the synthesis of ZnP_2 in a evacuated quartz tube, the ZnP_2 shell can be formed at the surface of the melted Zn. Then the synthetic rate of ZnP_2 mainly depend on volatilizing extent of Zn_3P_2 and ZnP_2 in the shell at high temperature. This mechanism can explaine the fact that the synthesis of ZnP_2 requires sufficient time and that the temperature control at the zinc end has an obvious effect on synthetic rate.