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

So Nhu Le, Alexandra Navrotsky, Valerie Pralong

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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
Issue number6
StatePublished - Jun 2008
Externally publishedYes


  • 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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