Manganese ferrite synthesized from Mn(II) acetate plus hematite freeze-dried powders

Bellini  JV; de Medeiros  SN; Ponzoni  ALLLongen  FRde Melo  MACPaesano  A

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Manganese ferrite synthesized from Mn(II) acetate plus hematite freeze-dried powders

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Freeze-drying was used to obtain a homogeneous fine powder containing (CH3COO)(2)Mn-2H2O and ct-Fe2O3 (molar ratio Fe:Mn = 3: 1), which was thermally treated for 2 h in N-2 atmosphere, at 400 degrees C. This composite system was further annealed for 4 h in the same atmosphere, either at 700 degrees C or at 1000 degrees C. The 700 degrees C annealed sample was thermally treated in air at 1200 degrees C and then rapidly quenched. The phase transformations that occurred in the freeze-dried and heat-treated powders were investigated by thermal analyses, X-ray diffractometry, scanning electron microscopy and Mossbauer spectroscopy. Results showed that MnO-alpha-Fe2O3-Fe3O4 compounds were obtained after the first heat-treatment. Samples subsequently annealed in N atmosphere revealed the formation of Fe-rich manganese ferrites and manganowUstite phases. However, a single spinel phase was obtained for the sample that had been annealed and quenched in air. (c) 2007 Elsevier B.V. All rights reserved.

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来源
《Materials Chemistry and Physics》 |2007年第1期|92-98|共7页
作者
Bellini JV; de Medeiros SN; Ponzoni ALLLongen FRde Melo MACPaesano A;
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作者单位

Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
freeze-drying; manganese ferrite; thermal analysis; Mossbauer spectroscopy; THERMAL-DECOMPOSITION; CATION DISTRIBUTION; FINE PARTICLES; MOSSBAUER; TETRAHYDRATE; REDUCTION; IRON;

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机译：Kinetics of manganese(III) acetate in acetic acid: Generation of Mn(III) with Co(III), Ce(IV), and dibromide radicals; Reactions of Mn(III) with Mn(II), Co(II), hydrogen bromide, and alkali bromides
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7. catena-Poly[[tetrakis(μ2-acetato-κ2O:O′)dicopper(II)(Cu—Cu)]-μ2-acetato-κ2O:O′-[bis[μ2-3-(dimethylamino)propan-1-olato]-κ2N,O:O;κ2O:N,O-bis[(tetrahydrofuran-κO)copper(II)]]-μ2-acetato-κ2O:O′] [O] . Kibriya Ahmad, Javeed Akhtar, Madeleine Helliwell, 2008

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8. Multinational Limited Objective Experiment II (MN LOE II). [R] . 2003

机译：跨国有限公司目标实验II（mN LOE II）。

Manganese ferrite synthesized from Mn(II) acetate plus hematite freeze-dried powders

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