Synthesis, crystal structure, and electrical properties of the pyrochlores Pb{sub 2-x}Ln{sub x}Ru{sub 2}O{sub 7-y}(Ln = Nd, Gd)

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1995.1003· OSTI ID:552723

Kobayashi, H; Kanno, R; Kawamoto, Y ^[1]

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1. Kobe Univ., Hyogo (Japan); and others

The lead-lanthanoid pyrochlores Pb{sub 2-x}Ln{sub x}Ru{sub 2}O{sub 7-y}(Ln = Nd, Gd) have been synthesized and characterized by X-ray diffraction, neutron diffraction, and electrical resistivity measurements. The solid solutions synthesized from metal nitrates and ruthenium oxide showed two monophasic regions in both neodymium and gadolinium systems: an oxygen-vacancy-ordered phase with F43m symmetry for the lead-rich region, 0 {le} x {le} 0.2, and a vacancy-disordered phase with Fd3m symmetry for the lanthanoid-rich region, 1.0 {le} x {le} 2.0. Electrical resistivity measurements showed a metallic behavior for the lead-rich region of the solid solutions (0 {le} x {le} 0.2). In the lanthanoid-rich region, a change from metallic to semiconducting behavior was observed at 1.0 < x < 1.2 and 1.2

• OSTI ID: 552723
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 114; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
BOND ANGLE
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GADOLINIUM OXIDES
NEODYMIUM OXIDES
RUTHENIUM OXIDES