掺杂K_(0.22)WO_3的晶体结构

采用固态化学反应法制备了掺杂钾钨青铜(K1-xMx)0.22WO3(M=Na,Ca,Sr,Ba,Y和La;0x0.20).X射线衍射结果表明,在掺杂范围内,样品的晶体结构主相均为六方相,其中除Na以外,Ca,Sr,Ba,Y和La都能够部分替代K进入六方晶格中.通过对实验结果的分析,提出了由参数H(n,x,t)决定钨青铜类化合物掺杂机制的新观点.容忍因子t、化合价n和掺杂量x共同决定了此类材料的掺杂机制.对于不同的掺杂元素M,掺杂后样品(K1-xMx)0.22WO3的H在相同范围内时,其晶胞体积V随x的变化规律也相似.

Doped K_(0.22)WO_3 Crystal Structure

Doped potassium tungsten bronzes(K1-xMx)0.22WO3(M=Na,Ca,Sr,Ba,Y and La;0x0.20)were synthesized with solid state reactions.X-ray diffraction analysis results reveal that the main phase of crystal structure for all samples is the hexagonal phase.In K0.22WO3,K can be partially substituted by all the doped elements except Na.The parameter H(n,x,t)about the doping mechanism of the tungsten bronzes is given according to the experimental data.The doping of the tungsten bronzes depends on parameters tolerance factor t,valence nand doping concentration x.For different doped element M,the cell volume of samples(K1-xMx)0.22WO3 has the similar xdependence as the parameter Hfalling into the same range.