A new processing method of CaZn2(OH)(6)center dot 2H(2)O powders: Photoluminescence and growth mechanism

作者：Xavier C S; Sczancoski J C; Cavalcante L S^*; Paiva Santos C O; Varela J A; Longo E; Li M Siu

来源：Solid State Sciences, 2009, 11(12): 2173-2179.

DOI：10.1016/j.solidstatesciences.2009.09.002

• CaZn2(OH)(6)center dot 2H(2)O
• Lozenge
• Rietveld refinement
• Crystal growth
• Photoluminescence

In this communication, we report on the formation of calcium hexahydroxodizincate dehydrate, CaZn2(OH)(6)center dot 2H(2)O (CZO) powders under microwave-hydrothermal (MH) conditions. These powders were analyzed by X-ray diffraction (XRD), Field-emission gum scanning electron microscopy (FEG-SEM), ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns confirmed that the pure CZO phase was obtained after MH processing performed at 130 degrees C for 2 h. FEG-SEM micrographs indicated that the morphological modifications as well as the growth of CZO microparticles are governed by Ostwald-ripening and coalescence mechanisms. UV-vis spectra showed that this material have an indirect optical band gap. The pure CZO powders exhibited an yellow PL emission when excited by 350 nm wavelength at room temperature.

• 出版日期2009-12