Synthesis and properties of niobium bronzes R[sub 1+x]Nb[sub 3]O[sub 9] (R = La, Ce, Nd)

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)00100-6· OSTI ID:6635597

Abakumov, A M; Shpanchenko, R V; Antipov, E V ^[1]

---

1. Moscow State Univ. (Russian Federation). Dept. of Chemistry

The phases with general formula R[sub 1+x]Nb[sub 3]O[sub 9] (R = La, Ce, Nd, x = 0--0.15) were synthesized and studied by X-ray powder diffraction, resistivity and magnetic susceptibility measurements. The homogeneity range of solid solutions increases concomitantly with the increase of the rare-earth cation radius, and it was found to be 0.05 for Nd, 0.1 for Ce and 0.15 for La at 1,200 C. The crystal structure of La[sub 1.15]Nb[sub 3]O[sub 9] was refined by X-ray powder data. It was found that all La cations occupy only one of two possible cation positions. Resistivity measurements revealed drastic changes of R(T) for increasing x. No diamagnetic effects were detected by susceptibility measurements down to 12K.

• OSTI ID: 6635597
• Journal Information: Materials Research Bulletin; (United States), Journal Name: Materials Research Bulletin; (United States) Vol. 30:1; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360200* -- Ceramics
Cermets
& Refractories
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS