Preparation of a new phase having a cation-ordered C-type rare-earth oxide related structure in the systems Bi{sub 2}O{sub 3}-Ln{sub 2}O{sub 3} (Ln = Sm, Eu, Gd, Tb, and Dy)

Journal Article · Wed Nov 15 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1371· OSTI ID:430256

Watanabe, Akiteru ^[1]

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1. National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki (Japan)

A new phase Bi{sub 1-x}Ln{sub x}O{sub 1.5} has been found in the systems Bi{sub 2}O{sub 3}-Ln{sub 2}O{sub 3} (Ln = Sm, Eu, Gd, Tb, and Dy with x = 0.38, 0.375, 0.275-0.40, 0.275-0.35, and 0.30-0.35, respectively). The produced the present phase; this phase crystallizes in the cubic system I2{sub 1}3 with a {approx} 11 {angstrom} and Z = 32, has a structure closely related to the C-type rare-earth oxide one, and is the low-temperature stable phase. Upon heating, the present phase transforms smoothly into the {delta}-Bi{sub 2}O{sub 3}-type high-temperature stable phase around 900{degrees}C. Upon cooling, however, a rate of transition of the opposite direction is extraordinarily sluggish. This sluggishness is discussed on the basis of the ordering of cations, Bi{sup 3+} and Ln{sup 3+}, in a proposed structure.

• OSTI ID: 430256
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 120; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CATIONS
CRYSTALLIZATION
DYSPROSIUM OXIDES
EUROPIUM OXIDES
GADOLINIUM OXIDES
PHASE STUDIES
SAMARIUM OXIDES
TERBIUM OXIDES
X-RAY DIFFRACTION