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首页> 外文期刊>Physica, B. Condensed Matter >Synthesis, structural and electrical properties of Ti modified Bi _2Sn _2O _7 pyrochlore
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Synthesis, structural and electrical properties of Ti modified Bi _2Sn _2O _7 pyrochlore

机译：Ti修饰的Bi _2Sn _2O _7烧绿石的合成，结构和电性能

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摘要

Polycrystalline ceramic samples of Bi _2Sn _(2-x)Ti _xO _7 (x=0.00, 0.2, 0.4, 0.6 and 0.8) have been synthesized by standard high temperature solid state reaction method. The effect of homovalent cation (titanium) substitution on the Sn-site on the structural and electrical properties of the pure Bi _2Sn _2O _7 ceramic have been studied by X-ray diffraction followed by SEM, dielectric and dc conductivity studies. The structural analysis indicates that the increase of titanium contents do not lead to any secondary phase. The frequency and temperature dependent dielectric studies have been carried out. It is found that the Ti doping reduces the material particle size. The size of the particles are strongly influenced by the addition of titanium to the system. The substitution of Ti for Sn ions affected the degree of disorder and modified the dielectric properties leading to more resistive ceramic compounds. The activation energies of all the compounds were calculated using the relation σ= σ 0exp(-Ea/kT).
机译：通过标准的高温固态反应方法合成了Bi _2Sn_（2-x）Ti_xO_7（x = 0.00、0.2、0.4、0.6和0.8）的多晶陶瓷样品。通过X射线衍射，SEM，介电和直流电导率研究，研究了Sn位上均价阳离子（钛）取代对纯Bi _2Sn _2O _7陶瓷的结构和电性能的影响。结构分析表明钛含量的增加不会导致任何次级相。已经进行了频率和温度相关的介电研究。发现Ti掺杂减小了材料粒径。向系统中添加钛会极大地影响颗粒的尺寸。用Ti替代Sn离子会影响无序程度并改变介电性能，从而产生更具电阻性的陶瓷化合物。使用关系式σ=σ0exp（-Ea / kT）计算所有化合物的活化能。

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