Crystal Growth of Thermoelectric Material NaxCoO2-δ by a Flux Method
Crystal Growth of Thermoelectric Material NaxCoO2-δ by a Flux Method
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助熔剂法晶体生长热电材料NaxCoO2-δ
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
I. Matsubara
中科院分区：
文献类型：
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作者：
M. Mikami;M. Yoshimura;Y. Mori;T. Sasaki;R. Funahashi;I. Matsubara
采用助熔剂法生长了NaxCoO_（2-δ）（0.5≤x≤1）晶体。NaxCoO 2-δ晶体的最大尺寸为10×10× 0. 5 mm 3，晶相取决于助熔剂的组成。由NaCl与Na 2CO 3和B2 O3混合熔剂生长的晶体和由Na 2CO 3与B2 O3混合熔剂生长的晶体分别被鉴定为Na0.6CoO2-δ（γ相）和Na0.9CoO2-δ（α相）。用粉末X射线衍射仪和能量色散X射线光谱仪分别测定了这些晶体生长的结构和组成。这两种晶体的面内热电势值随温度的升高而增加，在450 K时分别达到96 µV/K和87 µV/K。
NaxCoO2-δ (0.5≤x≤1) crystals were grown by a flux method. The largest NaxCoO2-δ crystal size was 10×10×0.5 mm3, and the crystal phase depended on the composition of the flux. Crystals grown from a flux of NaCl mixed with Na2CO3 and B2O3 and crystals grown from a flux of Na2CO3 mixed with B2O3 were identified as Na0.6CoO2-δ (γ phase) and Na0.9CoO2-δ (α phase), respectively. The structures and compositions of these crystal growths were determined with a powder X-ray diffraction device and an energy dispersive X-ray spectrometer, respectively. The in-plane thermoelectric power values of these two types of crystal increased with temperature and reached 96 µV/K and 87 µV/K at 450 K, respectively.