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

So Nhu Le; Alexandra Navrotsky; Valerie Pralong

doi:10.1016/j.solidstatesciences.2007.08.008

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

So Nhu Le, Alexandra Navrotsky, Valerie Pralong

Research output: Contribution to journal › Article › peer-review

15 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 language	English (US)
Pages (from-to)	761-767
Number of pages	7
Journal	Solid State Sciences
Volume	10
Issue number	6
DOIs	https://doi.org/10.1016/j.solidstatesciences.2007.08.008
State	Published - Jun 2008
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

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

Access to Document

10.1016/j.solidstatesciences.2007.08.008

Cite this

@article{09a721b9f607499098a3da81ef406573,

title = "Energetics of copper diphosphates - Cu2P2O7 and Cu3(P2O6OH)2",

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.",

keywords = "Copper phosphate, Cu(POOH), CuPO, Enthalpy of formation, Phase transformation",

author = "Le, {So Nhu} and Alexandra Navrotsky and Valerie Pralong",

note = "Funding Information: This work was supported by National Science Foundation under Grant DMR 06-01892.",

year = "2008",

month = jun,

doi = "10.1016/j.solidstatesciences.2007.08.008",

language = "English (US)",

volume = "10",

pages = "761--767",

journal = "Solid State Sciences",

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T1 - Energetics of copper diphosphates - Cu2P2O7 and Cu3(P2O6OH)2

AU - Le, So Nhu

AU - Navrotsky, Alexandra

AU - Pralong, Valerie

N1 - Funding Information: This work was supported by National Science Foundation under Grant DMR 06-01892.

PY - 2008/6

Y1 - 2008/6

N2 - 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.

AB - 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.

KW - Copper phosphate

KW - Cu(POOH)

KW - CuPO

KW - Enthalpy of formation

KW - Phase transformation

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