Zr{sub 1-} {sub x}Ln{sub x} W{sub 2}O{sub 8-} {sub x} {sub /2} (Ln=Eu, Er, Yb): Solid solutions of negative thermal expansion-synthesis, characterization and limited solid solubility

Zr{sub 1-} {sub x}Ln{sub x} W{sub 2}O{sub 8-} {sub x} {sub /2} solid solutions (Ln=Eu, Er, Yb) of different substitution fractions x have been synthesized. Their X-ray diffraction (XRD) patterns have been indexed and lattice parameters calculated based on the {alpha}-ZrW{sub 2}O{sub 8} structure. Th...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 180; no. 3
Main Authors Li Haihua, Han Jingsa, Ma Hui, Huang Ling, Zhao Xinhua
Format Journal Article
LanguageEnglish
Published United States 15.03.2007
Subjects
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LATTICE PARAMETERS
PHASE TRANSFORMATIONS
SOLID SOLUTIONS
SOLUBILITY
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
THERMAL EXPANSION
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTERBIUM COMPOUNDS
ZIRCONIUM TUNGSTATES
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Summary:Zr{sub 1-} {sub x}Ln{sub x} W{sub 2}O{sub 8-} {sub x} {sub /2} solid solutions (Ln=Eu, Er, Yb) of different substitution fractions x have been synthesized. Their X-ray diffraction (XRD) patterns have been indexed and lattice parameters calculated based on the {alpha}-ZrW{sub 2}O{sub 8} structure. The coefficients of thermal expansion (CTEs) of these solid solutions were estimated to be -10.3x10{sup -6} K{sup -1} in temperature range of 30-100 deg. C. The solubility of lanthanide ions in these solid solutions decreases linearly with the increase in the radius of substituted lanthanide ions. Based on the concentration dependence of phase transition temperatures, a novel method for determination of solubility of the lanthanide ions in Zr{sub 1-} {sub x}Ln{sub x} W{sub 2}O{sub 8-} {sub x} {sub /2} solid solutions has been developed. This method seems to be more sensitive as compared with that based on XRD technique. - Graphical abstract: The graphic displays the lattice parameters of saturated solid solutions and solubility of Zr{sub 1-} {sub x}Ln{sub x} W{sub 2}O{sub 8-} {sub y} as a function of the radius of substituted Ln {sup 3+} ions. A more sensitive method is developed to measure the low solubility of the solid solutions. This correlation demonstrates the increase in limited solid solubility follows the lanthanide contraction trend in a way that is opposite to that observed for lattice parameters.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2006.12.008