Controllable synthesis and magnetic property of BiMn{sub 2}O{sub 5} crystals

Journal Article · Tue Jul 01 00:00:00 EDT 2008 · Materials Research Bulletin

OSTI ID:21144040

Ruijie, Jia; Jiantao, Han ^[1]; Xiaojing, Wu; Changliang, Wu ^[2]

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1. Laboratory of Advanced Materials, Fudan University, Shanghai 200433 (China)
2. Department of Materials Science, Fudan University, Shanghai 200433 (China)

Uniform submicron BiMn{sub 2}O{sub 5} particles were prepared via a facile one-step hydrothermal route at low temperature. Bi(NO{sub 3}){sub 3}, MnCl{sub 2}.4H{sub 2}O and KMnO{sub 4} were used as starting materials; KOH as a pH adjustor and also as a mineralizer. Single-crystalline orthorhombic BiMn{sub 2}O{sub 5} sample with controllable morphology was obtained. The microstructure strongly depends on the molar ratio of the starting materials, KOH concentration and reaction temperature. X-ray photoelectron spectroscopy shows the existence of Mn{sup 4+} state. Magnetic measurement indicates Neel temperature T{sub N} at 44 K. The susceptibility above T{sub N} obeys the Curie-Weiss law, {chi} = C/(T - {theta}), with {theta} = -350 K. The effective paramagnetic moment {mu}{sub eff} = 4.66 {mu}{sub B}/Mn, demonstrating the coexistence of mixed Mn{sup 3+} and Mn{sup 4+} valences.

• OSTI ID: 21144040
• Journal Information: Materials Research Bulletin, Vol. 43, Issue 7; Other Information: DOI: 10.1016/j.materresbull.2007.07.023; PII: S0025-5408(07)00333-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH COMPOUNDS
BISMUTH NITRATES
CURIE-WEISS LAW
MAGNETIC PROPERTIES
MANGANESE COMPOUNDS
MANGANESE IONS
MICROSTRUCTURE
MONOCRYSTALS
MORPHOLOGY
NEEL TEMPERATURE
ORTHORHOMBIC LATTICES
OXIDES
PARAMAGNETISM
PERMANGANATES
PH VALUE
POTASSIUM HYDROXIDES
SYNTHESIS
X-RAY PHOTOELECTRON SPECTROSCOPY