Energetics of X-ray-amorphous zirconia and the role of surface energy in its formation

Irina Molodetsky; Alexandra Navrotsky; Michael J. Paskowitz; Valerie J. Leppert; Subhash H. Risbud

doi:10.1016/S0022-3093(99)00690-0

Energetics of X-ray-amorphous zirconia and the role of surface energy in its formation

Irina Molodetsky, Alexandra Navrotsky, Michael J. Paskowitz, Valerie J. Leppert, Subhash H. Risbud

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

48 Scopus citations

Abstract

X-ray-amorphous zirconia was synthesized by a low temperature process. The difference in the energetics of monoclinic and amorphous zirconia was calculated based on drop solution calorimetry of amorphous and monoclinic zirconia in lead borate (2PbO·B₂O₃) at 1073 K. X-ray-amorphous zirconia is about 58 kJ/mol less stable in enthalpy than the monoclinic phase. Amorphous zirconia heated to 573 K shows crystalline nanoparticles (cubic or tetragonal) of 3.8 nm average diameter. Formation of amorphous zirconia at low temperatures can be explained by its surface energy stabilization relative to monoclinic zirconia, with a difference Δσ to approximately 1.19±0.08 J/m².

Original language	English (US)
Pages (from-to)	106-113
Number of pages	8
Journal	Journal of Non-Crystalline Solids
Volume	262
Issue number	1
DOIs	https://doi.org/10.1016/S0022-3093(99)00690-0
State	Published - Feb 2000
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/S0022-3093(99)00690-0

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@article{44579026da16474aa77fbee368b90d3e,

title = "Energetics of X-ray-amorphous zirconia and the role of surface energy in its formation",

abstract = "X-ray-amorphous zirconia was synthesized by a low temperature process. The difference in the energetics of monoclinic and amorphous zirconia was calculated based on drop solution calorimetry of amorphous and monoclinic zirconia in lead borate (2PbO·B2O3) at 1073 K. X-ray-amorphous zirconia is about 58 kJ/mol less stable in enthalpy than the monoclinic phase. Amorphous zirconia heated to 573 K shows crystalline nanoparticles (cubic or tetragonal) of 3.8 nm average diameter. Formation of amorphous zirconia at low temperatures can be explained by its surface energy stabilization relative to monoclinic zirconia, with a difference Δσ to approximately 1.19±0.08 J/m2.",

author = "Irina Molodetsky and Alexandra Navrotsky and Paskowitz, {Michael J.} and Leppert, {Valerie J.} and Risbud, {Subhash H.}",

note = "Funding Information: We acknowledge useful discussions with David J. Duval regarding the amorphous zirconia powder synthesis. The calorimetry was supported by the US Department of Energy (grant DE 97ER-45654). ",

year = "2000",

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doi = "10.1016/S0022-3093(99)00690-0",

language = "English (US)",

volume = "262",

pages = "106--113",

journal = "Journal of Non-Crystalline Solids",

issn = "0022-3093",

publisher = "Elsevier B.V.",

number = "1",

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T1 - Energetics of X-ray-amorphous zirconia and the role of surface energy in its formation

AU - Molodetsky, Irina

AU - Navrotsky, Alexandra

AU - Paskowitz, Michael J.

AU - Leppert, Valerie J.

AU - Risbud, Subhash H.

N1 - Funding Information: We acknowledge useful discussions with David J. Duval regarding the amorphous zirconia powder synthesis. The calorimetry was supported by the US Department of Energy (grant DE 97ER-45654).

PY - 2000/2

Y1 - 2000/2

N2 - X-ray-amorphous zirconia was synthesized by a low temperature process. The difference in the energetics of monoclinic and amorphous zirconia was calculated based on drop solution calorimetry of amorphous and monoclinic zirconia in lead borate (2PbO·B2O3) at 1073 K. X-ray-amorphous zirconia is about 58 kJ/mol less stable in enthalpy than the monoclinic phase. Amorphous zirconia heated to 573 K shows crystalline nanoparticles (cubic or tetragonal) of 3.8 nm average diameter. Formation of amorphous zirconia at low temperatures can be explained by its surface energy stabilization relative to monoclinic zirconia, with a difference Δσ to approximately 1.19±0.08 J/m2.

AB - X-ray-amorphous zirconia was synthesized by a low temperature process. The difference in the energetics of monoclinic and amorphous zirconia was calculated based on drop solution calorimetry of amorphous and monoclinic zirconia in lead borate (2PbO·B2O3) at 1073 K. X-ray-amorphous zirconia is about 58 kJ/mol less stable in enthalpy than the monoclinic phase. Amorphous zirconia heated to 573 K shows crystalline nanoparticles (cubic or tetragonal) of 3.8 nm average diameter. Formation of amorphous zirconia at low temperatures can be explained by its surface energy stabilization relative to monoclinic zirconia, with a difference Δσ to approximately 1.19±0.08 J/m2.

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U2 - 10.1016/S0022-3093(99)00690-0

DO - 10.1016/S0022-3093(99)00690-0

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VL - 262

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EP - 113

JO - Journal of Non-Crystalline Solids

JF - Journal of Non-Crystalline Solids

IS - 1

ER -

Energetics of X-ray-amorphous zirconia and the role of surface energy in its formation

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