Coalescence of the crystallites under hydrothermal conditions (II) —— The morphology and stability energy calculation of cuprite  

作　　者：陈之战 施尔畏 元如林 郑燕青 李汶军 赵同荣 

机构地区：[1]Shanghai Institute of Ceramics, Chinese Academy of Sciences [2]Shanghai College of Finance

出　　处：《Science China(Technological Sciences)》2003年第4期423-431,共9页中国科学（技术科学英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant No.59832080);Natural Science Foundation of Jiangxi Province(No.0111015).

摘　　要：Cuprite (Cu2O) particles are synthesized by hydrothermal method. Most crystalline particles have long column morphology. Particles which are regarded as assembling of the crystallites in definite directions are observed. The typical example is the particles formed by assembling six columns in three perpendicular directions. The cone surfaces are visible at the tops of the columns. The results revealed that the coalescence of the crystallites did happen under hydrothermal conditions in which the crystallite connected with other crystallite on certain structure compatible surfaces to form a crystalline particle with a special morphology. This phenomenon is called the second kind of coalescence. The Cu2O structure unit is determined by its crystal structure. It is concluded that the tetragonal prism and three tetragonal prism-like growth units are the favorable units after stability energy calculation was performed on different kinds of growth units. It is believed that the first kind of coalescence exists commonly. The second kind of coalescence is unlikely to occur for all crystallites under hydrothermal conditions. The occurrence is dependent on the crystal structure.Cuprite (Cu2O) particles are synthesized by hydrothermal method. Most crystalline particles have long column morphology. Particles which are regarded as assembling of the crystallites in definite directions are observed. The typical example is the particles formed by assembling six columns in three perpendicular directions. The cone surfaces are visible at the tops of the columns. The results revealed that the coalescence of the crystallites did happen under hydrothermal conditions in which the crystallite connected with other crystallite on certain structure compatible surfaces to form a crystalline particle with a special morphology. This phenomenon is called the second kind of coalescence. The Cu2O structure unit is determined by its crystal structure. It is concluded that the tetragonal prism and three tetragonal prism-like growth units are the favorable units after stability energy calculation was performed on different kinds of growth units. It is believed that the first kind of coalescence exists commonly. The second kind of coalescence is unlikely to occur for all crystallites under hydrothermal conditions. The occurrence is dependent on the crystal structure.

关 键 词：HYDROTHERMAL method  coalescence  cuprite  STABILITY of growth unit. 

分 类 号：O782[理学—晶体学]