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

被引：19

作者：

Bellini, J. V. ^{[1
]}

de Medeiros, S. N. ^{[1
]}

Ponzoni, A. L. L. ^{[1
]}

Longen, F. R. ^{[1
]}

de Melo, M. A. C. ^{[1
]}

Paesano, A., Jr. ^{[1
]}

机构：

[1] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana, Brazil

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2007年 / 105卷 / 01期

关键词：

freeze-drying; manganese ferrite; thermal analysis; Mossbauer spectroscopy;

D O I：

10.1016/j.matchemphys.2007.04.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：92 / 98

页数：7

共 28 条

[1] Solubilities of manganese, cadmium, mercury and lead acetates in water from T=278.15 K to T=340.15 K
Apelblat, A
Manzurola, E
[J]. JOURNAL OF CHEMICAL THERMODYNAMICS, 2001, 33 (02) : 147 - 153
[2] Bellini J.V., 2002, Mat. Res., V5, P453, DOI 10.1590/S1516-14392002000400010
[3] Thermoelectrical and thermal analyses of copper(II) acetate monohydrate ZnO-matrix composite powder obtained by freeze-drying
Bellini, JV
Pineda, EAG
Rocha, RD
Ponzoni, ALD
Paesano, A
[J]. THERMOCHIMICA ACTA, 2006, 441 (02) : 111 - 115
[4] Ceramic system based on ZnO•CuO obtained by freeze-drying
Bellini, JV
Morelli, MR
Kiminami, RHGA
[J]. MATERIALS LETTERS, 2003, 57 (24-25) : 3775 - 3778
[5] Physical changes of sintered ceramics obtained from freeze-dried ZnO+(CH3COO)2Cu•H2O powders
Bellini, JV
Morelli, MR
Kiminami, RHGA
[J]. MATERIALS LETTERS, 2003, 57 (22-23) : 3325 - 3329
[6] Electrical properties of polycrystalline ZnO: Cu obtained from freeze-dried ZnO plus copper(II) acetate powders
Bellini, JV
Morelli, MR
Kiminami, RHGA
[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, 2002, 13 (08) : 485 - 489
[7] Stability region and oxygen stoichiometry of manganese ferrite
Bonsdorf, G
Schafer, K
Teske, K
Langbein, H
Ullmann, H
[J]. SOLID STATE IONICS, 1998, 110 (1-2) : 73 - 82
[8] Bonsdorf G, 1997, SOLID STATE IONICS, V101, P351
[9] Freeze-dried acetates of La, Sr and Mn-reactive precursors of (La, Sr)(n+1)MnnO(3n+1)-compounds
Börger, A
Dallmann, H
Langbein, H
[J]. THERMOCHIMICA ACTA, 2002, 387 (02) : 141 - 152
[10] Burojeanu VM, 2001, INT J INORG MATER, V3, P525

← 1 2 3 →