电化学技术制备BaMoO4薄膜的初期生长特性

采用恒电流电化学技术直接在金属钼片上制备了具有白钨矿结构的钼酸盐(BaMoO4)薄膜.对BaMoO4薄膜进行了SEM测试,并对相应的测试结果进行了对比和分析.研究表明,在薄膜生长初期,其生长特性具有若干显著的特点,包括晶核和晶粒优先选择在基体缺陷处堆砌和生长;生长初期形成的晶核都具有白钨矿结构的骨架;晶核和刚开始长大生成的晶粒都是疏松的;晶粒都明显显示有蜂窝状空隙存在等.在薄膜生长的初始阶段,晶粒基本上以其c轴垂直于薄膜基体表面进行生长;随着薄膜制备时间的延长,晶粒的生长方向倾向于按其c轴在薄膜的表面内的方向进行生长.

Growth Characteristic of BaMoO4 Films at Their Early Stage by Electrochemical Technique

Barium molybdate(BaMoO4)films with scheelite-structure were prepared directly on metal molybdenum substrates by constant current electrochemical technique.The measurements of the SEM images of the films were carried out.It was found that the growth of the films at their early stages possessed several remarkable characteristics,and the nucleuses of the films piled up and grew prior the places of the substrate with more defects.The crystalline nucleuses formed have the skeleton of the scheelite-structure;the crystalline nucleuses and the crystal granules which are just growing up are all porous,and the crystalline granules have the interstices of the beehive form obviously.At the initial stage of the growth,the crystalline granule grows in the direction that its C axis is perpendicular to the surface of the substrate;and along with the extension of deposition time,the growth direction of the crystalline granule trends to its C axis being in the surface of the films.