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采用光学浮区法生长了层状过渡金属氧化物Bi2Sr2-x Ca x Co2O y(x=0,2)晶体。通过XRD,SEM和TEM结构表征,表明了生长的晶体为层状晶体,并确定了晶体生长的方向垂直与c轴。研究了晶体的热电性能,包括Bi2Ca2Co2O y和Bi2Sr2Co2O y晶体ab面的Seeback系数和电阻率,表明了Bi2Ca2Co2O y具有较好的热电势和电导,并分析了电输运性能与晶体失配结构的关系。
The layered transition metal oxide Bi2Sr2-xCaxCo2Oy (x = 0,2) was grown by optical floatation. The XRD, SEM and TEM characterization of the crystal shows that the grown crystal is a layered crystal and the direction of crystal growth is perpendicular to the c-axis. The thermoelectric properties of the crystals, including the Seeback coefficient and the resistivity of the Bi2Ca2Co2Oy and Bi2Sr2Co2Oy crystal ab planes, have been investigated. The results show that Bi2Ca2Co2O y has good thermoelectric power and conductance and the relationship between the electrical transport properties and the crystal mismatch structure .