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Title: Room temperature metathetic synthesis and characterization of {alpha}-hopeite, Zn{sub 3}(PO{sub 4}){sub 2}.4H{sub 2}O

The synthesis of crystalline zinc phosphates ({alpha}-hopeite phase) through the metathetic pathway has been investigated. The reaction has been carried out by room-temperature grinding. High lattice energy of the by-product NaCl has driven the reaction in the forward direction, and as a result, stable phosphate phases have been synthesized. Reaction of a different phosphorus source (like Na{sub 3}PO{sub 4}, Na{sub 2}HPO{sub 4}, NaH{sub 2}PO{sub 4}, and K{sub 2}HPO{sub 4}) with ZnCl{sub 2} has been attempted. The structural, vibrational, thermal, optical, and chemical properties of synthesized powders are determined by powder X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and diffused reflectance spectra (DR) in the UV-vis range. The direct band gap of the title compound was determined to be 3.6 {+-} 0.2 eV.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523 (United States)
  2. Department of Mechanical Engineering, Colorado State University, Fort Collins, CO 80523 (United States), E-mail: mani@engr.colostate.edu
  3. Department of Chemistry, Colorado State University, Fort Collins, CO 80523 (United States)
Publication Date:
OSTI Identifier:
21144050
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 43; Journal Issue: 7; Other Information: DOI: 10.1016/j.materresbull.2007.07.005; PII: S0025-5408(07)00311-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BY-PRODUCTS; CERAMICS; CHEMICAL PROPERTIES; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; GRINDING; INFRARED SPECTRA; MILLI EV RANGE; SCANNING ELECTRON MICROSCOPY; SODIUM CHLORIDES; SODIUM PHOSPHATES; SYNTHESIS; TEMPERATURE RANGE 0273-0400 K; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY; ZINC CHLORIDES; ZINC PHOSPHATES