Thermal expansion properties of Ln{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (Ln = Er and Y)

Journal Article · Thu Oct 15 04:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2009.06.016· OSTI ID:22029746

Wu, M M ^[1]; Hu, Z B ^[2]; Liu, Y T ^[1]

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1. China Institute of Atomic Energy, Beijing 102413 (China)
2. College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049 (China)

Structures and thermal expansion properties of Ln{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (Ln = Er and Y) have been investigated by X-ray powder diffraction. Rietveld analysis results of Ln{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} indicate that compounds Er{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (0 {<=} x {<=} 0.3) and Y{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (0 {<=} x {<=} 0.2) crystallize in orthorhombic structure and exhibit negative thermal expansion, while both monoclinic and orthorhombic compounds Er{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (1.7 {<=} x {<=} 2.0) and Y{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} (1.8 {<=} x {<=} 2.0) possess positive coefficient of thermal expansion. The coefficients of linear thermal expansion of orthorhombic Ln{sub 2-x}Cr{sub x}Mo{sub 3}O{sub 12} change from negative to positive with increasing chromium content. Thermogravimetric and differential scanning calorimetry have been used to study the hygroscopicity and the phase transition temperature.

• OSTI ID: 22029746
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUGMENTATION
CALORIMETRY
CHROMIUM
HYGROSCOPICITY
MONOCLINIC LATTICES
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
THERMAL EXPANSION
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION