不同结晶相和微观形貌的KNbO_3陶瓷粉体的合成与表征  

Synthesis and Characterization of Potassium Niobate Ceramic Powders with Different Crystalline Phases and Morphologies

作　　者：林波涛[1] 马峻峰[2] 任仰[1] 姜晓辉[1] 刘俊[1] 孙勇[2] 刘振森[2] 

机构地区：[1]中国海洋大学,青岛266003 [2]绿色建筑材料国家重点实验室,北京100024

出　　处：《硅酸盐通报》2008年第4期863-866,共4页Bulletin of the Chinese Ceramic Society

摘　　要：通过Nb2O5·nH2O凝胶和不同的钾源（KNO3或者K2CO3）在简单直接反应下可制得具有不同晶相组成和结晶形貌的铌酸钾（KNbO3，以下简写为KN）陶瓷粉体。当采用KNO3时，产物为长度10～20μm、宽度2～4μm的正交晶相KNbO3（O-KN）微米片；在其它条件相同的情况下，如以K2CO3替代KNO，作为钾源，只能得到团聚的、微观形貌不规则的菱方晶相KNbO3（R—KN）陶瓷粉体。XRD和SEM分析表征发现，在反应过程中出现的层状中间产物K4Nb6O17直接导致了不常见的O-KN微米片结晶；模板化的结晶过程可以在无任何有机添加剂的条件下实现。Potassium niobate （KNbO3, abbreviated as KN） powders with different crystalline phases and morphologies were successfully synthesized by a facile direct reaction of Nb2O5·nH2O gel and varying potassium sources （ KNO3 or K2CO3 ）. Anisotropic orthorhombic KN （ O-KN ） microsheets with lengths of 10 - 20μm and widths of 2 - 4μm could be prepared by using KNO3 as potassium source, while rhombohedral KN （ R-KN ） powders composed of aggregated and irregular particles were obtained by using K2CO3 as potassium source. The XRD analysis and SEM observation revealed that highly anisotropic,layered structure of K4Nb6O17 appearing in the case of using KNO3 as potassium source defined the shape of the O-KN microsheets. The templated crystallization could be realized without adding any organic reagent.

关 键 词：KNBO3 各向异性 压电材料 陶瓷 晶相组成 

分 类 号：TQ174.758[化学工程—陶瓷工业]