Thermal expansion behavior of some rare earth oxide pyrochlores

Journal Article · Fri Jul 01 00:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90201-1· OSTI ID:7174839

Kutty, K V.G.; Rajagopalan, S; Mathews, C K ^[1]; Varadaraju, U V ^[2]

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1. Indira Gandhi Centre for Atomic Research, Kalpakkam (India)
2. Indian Inst. of Tech., Madras (India). Materials Science Research Centre

Oxide pyrochlores of the composition Ln[sub 2]M[sub 2]O[sub 7] (Ln = La - Gd; M = Zr, Hf) have been prepared and their thermal expansion coefficients determined in the temperature range 298--1,500 K by means of high temperature x-ray powder diffractometry. It is seen that for a given M atom, the expansion coefficient increases with the atomic number of the lanthanide element. Between the Zr and Hf series of compounds, the zirconates are found to be more expansive. The results support the ionic model for this class of compounds.

• OSTI ID: 7174839
• Journal Information: Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 29:7; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
EXPANSION
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HAFNIUM COMPOUNDS
HAFNIUM OXIDES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SCATTERING
THERMAL EXPANSION
TRANSITION ELEMENT COMPOUNDS
USES
X-RAY DIFFRACTION
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES