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

So Nhu Le; Alexandra Navrotsky

doi:10.1016/j.jssc.2007.06.017

Energetics of phosphate frameworks containing zinc and cobalt: NaZnPO₄, NaH(ZnPO₄)₂, NaZnPO₄·H₂O, NaZnPO₄·frac(4, 3)H₂O, and NaCo_xZn_1-xPO₄·frac(4, 3)H₂O

So Nhu Le, Alexandra Navrotsky

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

15 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 NaCo_xZn_1-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 language	English (US)
Pages (from-to)	2443-2451
Number of pages	9
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	9
DOIs	https://doi.org/10.1016/j.jssc.2007.06.017
State	Published - Sep 2007
Externally published	Yes

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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10.1016/j.jssc.2007.06.017

Cite this

@article{8101a36e4bc349e0b295e9d1e7f75729,

title = "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",

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.",

keywords = "Cobalt-zinc phosphate, Enthalpy of formation, Enthalpy of phase transition, NaZnPO frameworks, Sodium zinc phosphate",

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

note = "Funding Information: This work was supported by National Science Foundation under Grant DMR 06-01892. We thank Dr. Sarah Roeske for her assistance in microprobe analysis.",

year = "2007",

month = sep,

doi = "10.1016/j.jssc.2007.06.017",

language = "English (US)",

volume = "180",

pages = "2443--2451",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

number = "9",

}

TY - JOUR

T1 - Energetics of phosphate frameworks containing zinc and cobalt

T2 - NaZnPO4, NaH(ZnPO4)2, NaZnPO4·H2O, NaZnPO4·frac(4, 3)H2O, and NaCoxZn1-xPO4·frac(4, 3)H2O

AU - Le, So Nhu

AU - Navrotsky, Alexandra

N1 - Funding Information: This work was supported by National Science Foundation under Grant DMR 06-01892. We thank Dr. Sarah Roeske for her assistance in microprobe analysis.

PY - 2007/9

Y1 - 2007/9

N2 - 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.

AB - 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.

KW - Cobalt-zinc phosphate

KW - Enthalpy of formation

KW - Enthalpy of phase transition

KW - NaZnPO frameworks

KW - Sodium zinc phosphate

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