Synthesis, symmetry, and physical properties of cerium pyrophosphate

K. M. White; P. L. Lee; P. J. Chupas; K. W. Chapman; E. A. Payzant; A. C. Jupe; W. A. Bassett; C. S. Zha; A. P. Wilkinson

doi:10.1021/cm702338h

Synthesis, symmetry, and physical properties of cerium pyrophosphate

K. M. White, P. L. Lee, P. J. Chupas, K. W. Chapman, E. A. Payzant, A. C. Jupe, W. A. Bassett, C. S. Zha, A. P. Wilkinson

Materials Engineering

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Abstract

CeP₂O₇, a close structural relative of ZrP ₂O₇, and many other M^IVX₂O ₇ (X - P, V, As) phases, forms on heating Ce(HPO₄) ₂·xH₂O between ∼300 and 600°C and decomposes by oxygen loss at higher temperatures. In-situ X-ray diffraction measurements showed, for some precursor batches, the formation of CeP ₂O₇ in two distinct stages. At room temperature, CeP ₂O₇ is pseudocubic, but probably triclinic, displaying positive thermal expansion below ∼115°C. Above this temperature, there is a transition to cubic symmetry (Pa3̄) with the linear coefficient of thermal expansion going to zero at ∼450°C and becoming negative at higher temperatures. CeP₂O₇ probably undergoes two phase transitions on compression below ∼10.5 GPa. The phase existing between 0.65 and ∼5 GPa is soft with an average bulk modulus of ∼18 GPa.

Original language	English
Pages (from-to)	3728-3734
Number of pages	7
Journal	Chemistry of Materials
Volume	20
Issue number	11
DOIs	https://doi.org/10.1021/cm702338h
State	Published - Jun 10 2008

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@article{d61a54fdf1a94e81a0469073c9352723,

title = "Synthesis, symmetry, and physical properties of cerium pyrophosphate",

abstract = "CeP2O7, a close structural relative of ZrP 2O7, and many other MIVX2O 7 (X - P, V, As) phases, forms on heating Ce(HPO4) 2·xH2O between ∼300 and 600°C and decomposes by oxygen loss at higher temperatures. In-situ X-ray diffraction measurements showed, for some precursor batches, the formation of CeP 2O7 in two distinct stages. At room temperature, CeP 2O7 is pseudocubic, but probably triclinic, displaying positive thermal expansion below ∼115°C. Above this temperature, there is a transition to cubic symmetry (Pa{\=3}) with the linear coefficient of thermal expansion going to zero at ∼450°C and becoming negative at higher temperatures. CeP2O7 probably undergoes two phase transitions on compression below ∼10.5 GPa. The phase existing between 0.65 and ∼5 GPa is soft with an average bulk modulus of ∼18 GPa.",

author = "White, {K. M.} and Lee, {P. L.} and Chupas, {P. J.} and Chapman, {K. W.} and Payzant, {E. A.} and Jupe, {A. C.} and Bassett, {W. A.} and Zha, {C. S.} and Wilkinson, {A. P.}",

year = "2008",

month = jun,

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doi = "10.1021/cm702338h",

language = "English",

volume = "20",

pages = "3728--3734",

journal = "Chemistry of Materials",

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T1 - Synthesis, symmetry, and physical properties of cerium pyrophosphate

AU - White, K. M.

AU - Lee, P. L.

AU - Chupas, P. J.

AU - Chapman, K. W.

AU - Payzant, E. A.

AU - Jupe, A. C.

AU - Bassett, W. A.

AU - Zha, C. S.

AU - Wilkinson, A. P.

PY - 2008/6/10

Y1 - 2008/6/10

N2 - CeP2O7, a close structural relative of ZrP 2O7, and many other MIVX2O 7 (X - P, V, As) phases, forms on heating Ce(HPO4) 2·xH2O between ∼300 and 600°C and decomposes by oxygen loss at higher temperatures. In-situ X-ray diffraction measurements showed, for some precursor batches, the formation of CeP 2O7 in two distinct stages. At room temperature, CeP 2O7 is pseudocubic, but probably triclinic, displaying positive thermal expansion below ∼115°C. Above this temperature, there is a transition to cubic symmetry (Pa3̄) with the linear coefficient of thermal expansion going to zero at ∼450°C and becoming negative at higher temperatures. CeP2O7 probably undergoes two phase transitions on compression below ∼10.5 GPa. The phase existing between 0.65 and ∼5 GPa is soft with an average bulk modulus of ∼18 GPa.

AB - CeP2O7, a close structural relative of ZrP 2O7, and many other MIVX2O 7 (X - P, V, As) phases, forms on heating Ce(HPO4) 2·xH2O between ∼300 and 600°C and decomposes by oxygen loss at higher temperatures. In-situ X-ray diffraction measurements showed, for some precursor batches, the formation of CeP 2O7 in two distinct stages. At room temperature, CeP 2O7 is pseudocubic, but probably triclinic, displaying positive thermal expansion below ∼115°C. Above this temperature, there is a transition to cubic symmetry (Pa3̄) with the linear coefficient of thermal expansion going to zero at ∼450°C and becoming negative at higher temperatures. CeP2O7 probably undergoes two phase transitions on compression below ∼10.5 GPa. The phase existing between 0.65 and ∼5 GPa is soft with an average bulk modulus of ∼18 GPa.

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U2 - 10.1021/cm702338h

DO - 10.1021/cm702338h

M3 - Article

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SN - 0897-4756

VL - 20

SP - 3728

EP - 3734

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 11

ER -

Synthesis, symmetry, and physical properties of cerium pyrophosphate

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