Hyperfine interactions in and lattice parameters of pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7

B. Klobes; S. Finkeldei; W. Röhrig; D. Bosbach; R. P. Hermann

doi:10.1016/j.jpcs.2014.11.011

Hyperfine interactions in and lattice parameters of pyrochlore and defect fluorite (Eu_1-xNd_x)₂Zr₂O₇

B. Klobes, S. Finkeldei, W. Röhrig, D. Bosbach, R. P. Hermann

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

5 Scopus citations

Abstract

Pyrochlore and defect fluorite (Eu_1-xNd_x)₂Zr₂O₇ compounds (x=0, 0.5 and 0.75) synthesized by a wet chemical approach were investigated using temperature dependent high energy X-ray diffraction as well as ¹⁵¹Eu Mössbauer spectroscopy. Diffraction data reveals an increase in lattice parameter with increasing Nd content, an increase that is disproportionally large between x=0.5 and 0.75. The ¹⁵¹Eu Mössbauer spectral parameters, i.e. isomer shift and quadrupole splitting, fall in separate regions for pyrochlore and defect fluorite type compounds. Between 80 and 350 K, the impact of the order-disorder, i.e. pyrochlore to defect fluorite, transition on isomer shift and quadrupole splitting is found to exceed the one due to lattice expansion.

Original language	English
Pages (from-to)	43-48
Number of pages	6
Journal	Journal of Physics and Chemistry of Solids
Volume	79
DOIs	https://doi.org/10.1016/j.jpcs.2014.11.011
State	Published - Apr 2015
Externally published	Yes

Funding

Portions of this research were carried out at the light source PETRA III at DESY, a member of the Helmholtz Association (HGF). We would like to thank Dr. J. Bednarcik for assistance in using beamline P02. B.K. thanks M.A. Schweika for assistance in analyzing parts of the diffraction data. R.P.H. acknowledges support from the Helmholtz Association for the Helmholtz-University Young Investigator Group ‘Lattice Dynamic in Emerging Functional Materials’.

Funders	Funder number
Helmholtz Association

Keywords

A. Oxides
C. Mössbauer spectroscopy
C. X-ray diffraction

Access to Document

10.1016/j.jpcs.2014.11.011

Cite this

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title = "Hyperfine interactions in and lattice parameters of pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7",

abstract = "Pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7 compounds (x=0, 0.5 and 0.75) synthesized by a wet chemical approach were investigated using temperature dependent high energy X-ray diffraction as well as 151Eu M{\"o}ssbauer spectroscopy. Diffraction data reveals an increase in lattice parameter with increasing Nd content, an increase that is disproportionally large between x=0.5 and 0.75. The 151Eu M{\"o}ssbauer spectral parameters, i.e. isomer shift and quadrupole splitting, fall in separate regions for pyrochlore and defect fluorite type compounds. Between 80 and 350 K, the impact of the order-disorder, i.e. pyrochlore to defect fluorite, transition on isomer shift and quadrupole splitting is found to exceed the one due to lattice expansion.",

keywords = "A. Oxides, C. M{\"o}ssbauer spectroscopy, C. X-ray diffraction",

author = "B. Klobes and S. Finkeldei and W. R{\"o}hrig and D. Bosbach and Hermann, {R. P.}",

year = "2015",

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T1 - Hyperfine interactions in and lattice parameters of pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7

AU - Klobes, B.

AU - Finkeldei, S.

AU - Röhrig, W.

AU - Bosbach, D.

AU - Hermann, R. P.

PY - 2015/4

Y1 - 2015/4

N2 - Pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7 compounds (x=0, 0.5 and 0.75) synthesized by a wet chemical approach were investigated using temperature dependent high energy X-ray diffraction as well as 151Eu Mössbauer spectroscopy. Diffraction data reveals an increase in lattice parameter with increasing Nd content, an increase that is disproportionally large between x=0.5 and 0.75. The 151Eu Mössbauer spectral parameters, i.e. isomer shift and quadrupole splitting, fall in separate regions for pyrochlore and defect fluorite type compounds. Between 80 and 350 K, the impact of the order-disorder, i.e. pyrochlore to defect fluorite, transition on isomer shift and quadrupole splitting is found to exceed the one due to lattice expansion.

AB - Pyrochlore and defect fluorite (Eu1-xNdx)2Zr2O7 compounds (x=0, 0.5 and 0.75) synthesized by a wet chemical approach were investigated using temperature dependent high energy X-ray diffraction as well as 151Eu Mössbauer spectroscopy. Diffraction data reveals an increase in lattice parameter with increasing Nd content, an increase that is disproportionally large between x=0.5 and 0.75. The 151Eu Mössbauer spectral parameters, i.e. isomer shift and quadrupole splitting, fall in separate regions for pyrochlore and defect fluorite type compounds. Between 80 and 350 K, the impact of the order-disorder, i.e. pyrochlore to defect fluorite, transition on isomer shift and quadrupole splitting is found to exceed the one due to lattice expansion.

KW - A. Oxides

KW - C. Mössbauer spectroscopy

KW - C. X-ray diffraction

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