Effect of rotation of feed and seed rods on the quality of Na0.75CoO2 single crystal grown by traveling solvent floating zone method

Autor:	G. Krabbes, S. Paulraj, P. Kanchana, Chinnathambi Sekar, B. Schüpp-Niewa, Bernd Büchner, Rüdiger Klingeler
Rok vydání:	2011
Předmět:	Phase transition Materials science Mechanical Engineering Analytical chemistry Condensed Matter Physics Magnetic susceptibility Rod Solvent Crystallography Mechanics of Materials Impurity Phase (matter) Homogeneity (physics) General Materials Science Single crystal
Zdroj:	Materials Research Bulletin. 46:675-681
ISSN:	0025-5408
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::be5f0516d1434da681e196ca7ef685d2 https://doi.org/10.1016/j.materresbull.2011.01.027 Zobrazit plný text záznamu Full Text from ScienceDirect