Order-disorder transition in the Nd{sub 2-y}Y{sub y}Zr{sub 2}O{sub 7} system: Probed by X-ray diffraction and Raman spectroscopy

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.10.010· OSTI ID:21372446

Mandal, B P ^[1]; Krishna, P S.R. ^[2]

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1. Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)
2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085 (India)

A series of compositions having the general formula Nd{sub 2-y}Y{sub y}Zr{sub 2}O{sub 7} have been synthesized by heating of mixtures of oxides of the components cation and characterized by X-ray diffraction and Raman spectroscopy. Rietveld analysis on the XRD data of all the compositions has been performed which revealed a decrease in lattice parameter as a function of y in the series Nd{sub 2-y}Y{sub y}Zr{sub 2}O{sub 7} (y=0.0-0.8). Subsequently, a biphasic region starts which continues for y=1.2 and 1.6. The other end member, i.e. Y{sub 2}Zr{sub 2}O{sub 7} is found to be defect fluorite. On the other hand, Nd{sup 3+} has been used as surrogate material for Am{sup 3+}, which is a minor actinide found in spent nuclear fuel. In the pyrochlore range, the increasing trend of the x-parameter of 48f oxygen indicates the enhancement of disorder in the system. Raman spectroscopy has been employed to validate the data obtained from XRD. The involvement of 48f oxygen in disorder has also been verified by Raman spectroscopic investigation. - Graphical abstract: In Nd{sub 2-y}Y{sub y}Zr{sub 2}O{sub 7} series, the structure changes from pyrochlore to defect fluorite with increase in Y content in the series. The Raman spectra explicitly shows how the structural changes take place in the system.

• OSTI ID: 21372446
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMERICIUM IONS
CHALCOGENIDES
CHARGED PARTICLES
COHERENT SCATTERING
DIFFRACTION
HEATING
IONS
LASER SPECTROSCOPY
LATTICE PARAMETERS
MINERALS
NEODYMIUM COMPOUNDS
NEODYMIUM IONS
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PYROCHLORE
RAMAN SPECTRA
RAMAN SPECTROSCOPY
RARE EARTH COMPOUNDS
SCATTERING
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS