Energetics of copper diphosphates - Cu2P2O7 and Cu3(P2O6OH)2

So Nhu Le, Alexandra Navrotsky, Valerie Pralong

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Differential scanning calorimetry and high temperature oxide melt solution calorimetry are used to study enthalpy of phase transition and enthalpies of formation of Cu2P2O7 and Cu3(P2O6OH)2. α-Cu2P2O7 is reversibly transformed to β-Cu2P2O7 at 338-363 K with an enthalpy of phase transition of 0.15 ± 0.03 kJ mol-1. Enthalpies of formation from oxides of α-Cu2P2O7 and Cu3(P2O6OH)2 are -279.0 ± 1.4 kJ mol-1 and -538.8 ± 2.7 kJ mol-1, and their standard enthalpies of formation (enthalpy of formation from elements) are -2096.1 ± 4.3 kJ mol-1 and -4302.7 ± 6.7 kJ mol-1, respectively. The presence of hydrogen in diphosphate groups changes the geometry of Cu(II) and decreases acid-base interaction between oxide components in Cu3(P2O6OH)2, thus decreasing its thermodynamic stability.

Original languageEnglish (US)
Pages (from-to)761-767
Number of pages7
JournalSolid State Sciences
Volume10
Issue number6
DOIs
StatePublished - Jun 2008
Externally publishedYes

Keywords

  • Copper phosphate
  • Cu(POOH)
  • CuPO
  • Enthalpy of formation
  • Phase transformation

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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