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光学浮区法生长Bi_2Sr(Ca)_2Co_2O_y晶体及电输运性质研究

Growth and Electric Transport Properties of Bi_2Sr(Ca)_2Co_2O_y Crystal by Optical Float Zone Method
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摘要 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。 In this paper, the layered transition metal oxides Bi2Sr2 -x CaxCo2Oy （x = 0,2 ） crystals were grown by optical floating zone method. The structure were characterized by X-ray diffraction and electron microscopy. The results indicated that single crystals have layered crystal structure, as well as single crystals were grown perpendicular to the c-axis. The samples in thermoelectric properties, including electrical property, Seebeck effectwere investigated. The electrical transport property showed that the ab- plane resistivity of Bi2Ca2Co2Oy is lower than that of Bi2Sr2Co2Oy. With the experiment data, the relationship between electrical transport property and the structurecrystal were analyzed.
作者 孙宁 董松涛 姚淑华
机构地区 南京大学现代工程与应用科学学院材料科学与工程系
出处 《人工晶体学报》 EI CAS CSCD 北大核心 2013年第10期1997-2001,共5页 Journal of Synthetic Crystals
基金 国家自然科学基金青年基金(51002074 51032003)
关键词 光学浮区法Bi2Sr(Ca)2CO2Oy晶体 电输运 optical floating zone Bi2 Sr （Ca） 2 Co2Oy crystal electric transport
分类号 TN3 [电子电信—物理电子学]
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参考文献16

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人工晶体学报
2013年 第10期

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