Magnetic and Moessbauer studies of 5% Fe-doped BiMnO{sub 3}

Journal Article · Sat Dec 15 00:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.10.006· OSTI ID:21043768

Hayashi, Naoaki ^[1]; Azuma, Masaki ^[2]; Muranaka, Shigetoshi ^[1]; Takano, Mikio ^[2]; Takayama-Muromachi, Eiji ^[3]

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1. Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501 (Japan)
2. Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611-0011 (Japan)
3. Advanced Nano Materials Laboratory (ANML), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)

{sup 57}Fe Moessbauer spectroscopy, dc and ac magnetization, specific heat, and differential scanning calorimetry measurements were performed in a powder BiMn{sub 0.95}Fe{sub 0.05}O{sub 3} sample prepared at 6 GPa and 1383 K. The substitution of 5% Fe for Mn increases the temperatures of the structural monoclinic-to-orthorhombic phase transition (from 768 to 779 K) and the ferromagnetic transition (from 98 to 109 K) by about 10 K in BiMn{sub 0.95}Fe{sub 0.05}O{sub 3} compared with BiMnO{sub 3}. On the other hand, the temperature of the monoclinic-to-monoclinic phase transition associated with the orbital ordering strongly decreases in BiMn{sub 0.95}Fe{sub 0.05}O{sub 3} (414 K) compared with that of BiMnO{sub 3} (474 K). The saturated magnetic moment at 5 K and 5 T is also suppressed from 3.92 {mu}{sub B} per formula unit in BiMnO{sub 3} to 3.35 {mu}{sub B} in BiMn{sub 0.95}Fe{sub 0.05}O{sub 3}. The large quadrupole splitting (1.18 mm/s) observed at 293 K in BiMn{sub 0.95}Fe{sub 0.05}O{sub 3} can be explained by the strong Jahn-Teller distortion and cooperative orbital order. The quadrupole splitting reduces by two times above the orbital melting temperature. - Graphical abstract: Moessbauer spectra of BiMn{sub 0.95}Fe{sub 0.05}O{sub 3} at 523 and 293 K.

• OSTI ID: 21043768
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 12; Other Information: DOI: 10.1016/j.jssc.2007.10.006; PII: S0022-4596(07)00411-2; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BISMUTH COMPOUNDS
CALORIMETRY
DOPED MATERIALS
IRON COMPOUNDS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MANGANESE COMPOUNDS
MELTING POINTS
MOESSBAUER EFFECT
MONOCLINIC LATTICES
ORTHORHOMBIC LATTICES
OXIDES
PHASE TRANSFORMATIONS
PRESSURE RANGE GIGA PA
QUADRUPOLES
SPECIFIC HEAT
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K