Energetics of phosphate frameworks containing zinc and cobalt: NaZnPO4, NaH(ZnPO4)2, NaZnPO4·H2O, NaZnPO4·frac(4, 3)H2O, and NaCoxZn1-xPO4·frac(4, 3)H2O

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14 Scopus citations

Abstract

Differential scanning calorimetry and high temperature oxide melt solution calorimetry were used to study the enthalpy of the α-β phase transformation of NaZnPO4 and enthalpies of formation of α-NaZnPO4, NaH(ZnPO4)2, NaZnPO4·H2O, and NaCoxZn1-xPO4·frac(4, 3)H2O (x=0, 0.1, 0.2, 0.3). The enthalpies of formation from the oxides of cobalt substituted in NaZnPO4·frac(4, 3)H2O do not depend on cobalt content, confirming similar acid-base interactions for Zn-PO4 and Co-PO4. While water molecules stabilize zinc phosphate frameworks through solvating a cation or forming extra hydrogen bonds, the partial substitution of water for sodium oxide to form NaH(ZnPO4)2 represents the formation of an acidic compound with weaker acid-base interactions and less exothermic enthalpy of formation from oxides than Na2(ZnPO4)2.

Original languageEnglish (US)
Pages (from-to)2443-2451
Number of pages9
JournalJournal of Solid State Chemistry
Volume180
Issue number9
DOIs
StatePublished - Sep 2007
Externally publishedYes

Keywords

  • Cobalt-zinc phosphate
  • Enthalpy of formation
  • Enthalpy of phase transition
  • NaZnPO frameworks
  • Sodium zinc phosphate

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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