G. , Ramasamy and G. , Bhagavannarayana and G., Madhurambal and Meenakshisundaram, Subbiah (2012) Crystal growth, structure, crystalline perfection and characterization of zinc magnesium ammonium sulfate hexahydrate mixed crystals ZnxMg(1-x)(NH4)(2)(SO4)(2) center dot 6H(2)O. Journal of Crystal Growth, 352 (1). pp. 137-142. ISSN 0022-0248

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Abstract

Mixed crystals ZnxMg(1-x)(NH4)(2)(SO4)(2) center dot 6H(2)O of the two well-known Tutton's salts Zn(NH4)(2)(SO4)(2) center dot 6H(2)O and Mg(NH4)(2)(SO4)(2) center dot 6H(2)O were grown with varying molar proportions (x=0.10-0.90) by slow evaporation solution growth technique. The mixed crystal Zn0.54Mg0.46(NH4)(2)(SO4)(2) center dot 6H(2)O is crystallizing in monoclinic system with space group P2(1)/c and cell parameters a=6.2217(4) angstrom, b=12.5343(7) angstrom, c=9.2557(6) angstrom, beta=106.912(3)degrees. The coexistence of zinc and magnesium ions in the mixed crystal was confirmed by inductively coupled plasma (ICP), atomic absorption spectroscopy (AAS) and energy dispersive X-ray spectroscopy (EDS). Compositional dependence of lattice parameters follows Vegard's relations. Slight variations are observed in FT-IR and XRD of pure and mixed crystals. Comparison of crystalline perfection as evaluated by high-resolution X-ray diffraction (HRXRD) for mixed crystals of various proportions reveals a reasonably good crystalline perfection for the mixed crystal with nearly equimolar ratio of Zn and Mg. The surface morphology of the mixed crystals changing with composition was studied by scanning electron microscopy (SEM). UV-vis studies reveal that the transparency of the mixed crystals was not much affected.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Crystallography Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	07 Feb 2020 08:02
Last Modified:	07 Feb 2020 08:02
URI:	http://npl.csircentral.net/id/eprint/3657

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