Structures, thermal expansion properties and phase transitions of Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} (0.0 {le} x {le} 2.0).

Journal Article · Thu May 03 04:00:00 EDT 2007 · Sol. State Sci.

DOI:https://doi.org/10.1016/j.solidstatesciences.2007.04.018· OSTI ID:994062

Cheng, Y Z; Wu, M M; Peng, J; Xiao, X L; Li, Z X; Hu, Z B; Kiyanagi, R; Fieramosca, J S; Short, S; Jorgensen, J

Structures, thermal expansion properties and phase transitions of Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} (0.0 {le} x {le} 2.0) have been investigated by X-ray diffraction and differential thermal analysis. The partial substitution of Er{sup 3+} for Fe{sup 3+} induces pronounced decreases in the phase transition temperature from monoclinic to orthorhombic structure. Rietveld analysis of the XRD data shows that both the monoclinic and orthorhombic Fe{sub 2}(MoO{sub 4}){sub 3}, as well as the orthorhombic Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} (x {le} 0.8) have positive thermal expansion coefficients. However, the linear thermal expansion coefficients of Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} (x = 0.6-2.0) decrease with increasing content of Er{sup 3+} and for x {ge} 1.0, compounds Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} show negative thermal expansion properties. Attempts for making zero thermal expansion coefficient materials result in that very low negative thermal expansion coefficient of -0.60 x 10{sup -6} C in Er{sub 1.0}Fe{sub 1.0}(MoO{sub 4}){sub 3} is observed in the temperature range of 180-400 C, and zero thermal expansion is observed in Er{sub 0.8}Fe{sub 1.2}(MoO{sub 4}){sub 3} in the temperature range of 350-450 C. In addition, anisotropic thermal expansions are found for all the orthorhombic Er{sub x}Fe{sub 2-x}(MoO{sub 4}){sub 3} compounds, with negative thermal expansion coefficients along the a axes.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; Chinese Academy of Sciences
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 994062
• Report Number(s): ANL/MSD/JA-68450
• Journal Information: Sol. State Sci., Journal Name: Sol. State Sci. Journal Issue: May 3, 2007 Vol. 9; ISSN 1293-2558
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
ERBIUM COMPOUNDS
IRON COMPOUNDS
MOLYBDATES
PHASE TRANSFORMATIONS
THERMAL EXPANSION
TRANSITION TEMPERATURE
X-RAY DIFFRACTION