Intergrowth and thermoelectric properties in the Bi-Ca-Co-O system

Details Intergrowth and thermoelectric properties in the Bi-Ca-Co-O system Intergrowth and thermoelectric properties in the Bi-Ca-Co-O system

2007-07-17

arxiv.org/abs/0707.2503v1

J. Cryst. Growth 308, 309-313 (2007)

Physics

Condensed Matter

Materials Science

8 pages, 7 figures. To be published in Journal of Crystal Growth

Scientific paper

10.1016/j.jcrysgro.2007.07.037

Single crystals of the Bi-Ca-Co-O system have been grown using the flux method with cooling from 900$\celsius$ and 950$\celsius$, respectively. The single crystals are characterized by transmission electron microscopy and X-ray diffraction. The misfit cobaltite [Ca$_2$Bi$_{1.4}$Co$_{0.6}$O$_4$]$^{RS}$[CoO$_2$]$_{1.69}$ single crystals with quadruple ($n$=4) rocksalt (RS) layer are achieved with cooling from 900$\celsius$. Such crystal exhibits room-temperature thermoelectric power (TEP) of 180$\mu$V/K, much larger than that in Sr-based misfit cobaltites with quadruple RS layer. However, intergrowth of single crystals of quadruple ($n$=4) and triple ($n$=3) RS-type layer-based misfit cobaltites is observed with cooling from 950$\celsius$. Both of TEP and resistivity were obviously enhanced by the intergrowth compared to [Ca$_2$Bi$_{1.4}$Co$_{0.6}$O$_4$]$^{RS}$[CoO$_2$]$_{1.69}$ single crystal, while the power factor at room temperature remains unchanged.

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