水热法α-Al_2O_3自发结晶和形态控制  

Morphological Forms Control of α-Al_2O_3 Crystal Spontaneously Synthesized by Hydrothermal Method

作　　者：董国义[1] 葛世艳[1] 韦志仁[1] 窦军红 张华伟[1] 王立明[1] 李志强[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《人工晶体学报》2004年第3期380-383,共4页Journal of Synthetic Crystals

基　　金：河北省自然科学基金 ( 5 0 2 12 3 ) ;河北省科技攻关 ( 2 2 12 2 0 4) ;河北省教育厅资助项目 ( 2 0 0 2 15 8)

摘　　要：本文研究了高温高压水热法合成α Al2 O3 晶体的形态特征。在水热条件下 ,α Al2 O3 的晶体形态和合成温度、矿化剂浓度有密切关系。当KOH浓度和温度较低时 (如 0 .1MKOH ,390℃ ) ,显露c{ 0 0 0 1}、a{ 11 2 0 }、r{ 0 1 12 }、n{ 11 2 3}晶面。随着矿化剂浓度和温度的提高 ,晶体r{ 0 1 12 }和n{ 11 2 3}面的显露面积越来越小 ,直到完全消失 (如2MKOH ,4 0 0℃ ) ,晶体只显露底面c{ 0 0 0 1}、和柱面a{ 11 2 0 } 。The shape and the interface morphological forms of α-Al_2O_3 crystal synthesized by hydrothermal method at high temperature and high pressure were investigated. Under the hydrothermal conditions, the shapes of the α-Al_2O_3 crystal have a close correlation with synthesized temperature and mineralizer concentration.When the concentration of KOH and the temperature are rather low (eg.0.1M KOH,390℃),the exposed faces of crystal are faces c{0001},a {11-20},r{01-12},n{11-23}. With the increase of the mineralizer concentration and the temperature, the exposed areas of faces r｛01-12｝ and n｛11-23｝ become smaller and smaller, till disappeared(eg. 2M KOH, 400℃), then the crystal only exposes bottom faces c ｛0001｝ and prism faces a ｛11-20｝, and appears hexagonal prism.

关 键 词：水热法 Α-AL2O3 水热合成工艺 晶体 水热反应 矿化剂 生长速度 

分 类 号：O782[理学—晶体学]