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Effect of rotation of feed and seed rods on the quality of Na0.75CoO2 single crystal grown by traveling solvent floating zone method |
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| Authors: | C. Sekar,S. Paulraj,B. Schü pp-Niewa,G. Krabbes |
| Affiliation: | a Department of Bioelectronics & Biosensors, Alagappa University, Karaikudi 630 003, India b Department of Physics, Periyar University, Salem 636 011, India c Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01171 Dresden, Germany d Kirchhoff Institute for Physics, University of Heidelberg, D-69120 Heidelberg, Germany |
| Abstract: | High purity Na0.75CoO2 single crystals have been grown by floating zone method. We found the rotation of feed and seed rods play a crucial role in growing high quality single crystal. Systematic investigations suggest the occurrence of a phase separation at microscopic level, such as the separation into Na-rich and Na-poor domains during the growth, and formation of impurity phase(s) depending on growth conditions. NaxCoO2 (x = 0.30, 0.60) crystals have been prepared by sodium deintercalation from Na0.75CoO2. Powder X-ray and energy dispersive X-ray analyses have confirmed the phase purity and homogeneity of the samples. Magnetic susceptibility measurements of x = 0.60 and 0.75 crystals indicate a bulk phase transition at 22 K and an anomaly around 339 K and 334 K respectively which are attributed to structural transition. In addition some unique features related to Na0.60CoO2 were observed. |
| Keywords: | A. Oxides B. Crystal growth C. X-ray diffraction D. Crystal structure D. Spin density wave |
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