Structural phase change in Co2.25Fe0.75O4 spinel oxide by vacuum annealing and role of coexisting CoO phase on magnetic properties

被引：28

作者：

Bhowmik, R. N. ^{[1
]}

Panda, Manas Ranjan ^{[1
]}

Yusuf, S. M. ^{[2
]}

Mukadam, M. D. ^{[2
]}

Sinha, A. K. ^{[3
]}

机构：

[1] Pondicherry Univ, Dept Phys, Pondicherry 605014, India

[2] Bhabha Atom Res Ctr, Div Solid State Phys, Bombay 400085, Maharashtra, India

[3] Raja Ramanna Ctr Adv Technol, Indus Synchrotrons Utilizat Div, Indore 452013, Madhya Pradesh, India

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 646卷

关键词：

Co rich spinel ferrite; Vacuum annealing; X-ray absorption near edge structure; Synchrotron X-ray diffraction; Ferrimagnetic properties; COBALT FERRITE; EXCHANGE BIAS; NANOPARTICLES; SQUARENESS;

D O I：

10.1016/j.jallcom.2015.05.276

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The spinel oxide Co2.25Fe0.75O4 has been prepared by co-precipitation route. The as prepared material has been annealed at 800 degrees C under vacuum. Properties of the samples annealed under vacuum have been compared with the sample annealed in air. Synchrotron X-ray diffraction, Raman spectroscopy and X-ray absorption near edge structure spectroscopy have been used for structural phase characterization. The cubic spinel structure in air annealed sample has been splitted into Co and Fe rich phases. The Co rich spinel phase has transformed into Cobalt monoxide (CoO) after vacuum annealing. This has resulted an increase of Fe: Co ratio in the Fe rich spinel phase. Raman spectra indicated a transformation of the distribution of Co and Fe ions from normal spinel like structure for the sample annealed in air to mixed spinel structure for the samples annealed under vacuum. The existence tetravalent Fe4+ ion has been confirmed in all the samples and it is new information for Co doped spinel ferrite system. All the samples exhibited ferrimagnetic behavior and exchange bias effect. The focus point is that vacuum annealing has been used as an effective route of material processing to control the structural phase and also, enhancement of magnetic properties in Co rich ferrite. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：161 / 169

页数：9

共 36 条

[1] Structural studies of SrFeO3 and SrFe0.5Nb0.5O3 by employing XRD and XANES spectroscopic techniques [J].

Akhtar, M. Javed ;

Khan, R. Tahir Ali .

MATERIALS CHARACTERIZATION, 2011, 62 (10) :1016-1020

[2]

[Anonymous], 2013, J MAGN MAGN MATER, DOI DOI 10.1016/J.JMMM.2013.01.007

[3] Tailoring the properties and the reactivity of the spinel cobalt oxide [J].

Bahlawane, Naoufal ;

Ngamou, Patrick Herve Tchoua ;

Vannier, Vincent ;

Kottke, Tilman ;

Heberle, Joachim ;

Kohse-Hoeinghaus, Katharina .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2009, 11 (40) :9224-9232

[4] Alloying of Fe3O4 and Co3O4 to develop Co3xFe3(1-x)O4 ferrite with high magnetic squareness, tunable ferromagnetic parameters, and exchange bias [J].

Bhowmik, R. N. ;

Vasanthi, V. ;

Poddar, Asok .

JOURNAL OF ALLOYS AND COMPOUNDS, 2013, 578 :585-594

[5] Synthesis of Co1.5Fe1.5O4 spinel ferrite with high magnetic squareness and study its magnetic property by annealing the chemical routed sample at different temperatures [J].

Bhowmik, R. N. ;

Satya, A. T. ;

Bharathi, A. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2013, 559 :134-141

[6] Lattice expansion and noncollinear to collinear ferrimagnetic order in a MnCr2O4 nanoparticle [J].

Bhowmik, RN ;

Ranganathan, R ;

Nagarajan, R .

PHYSICAL REVIEW B, 2006, 73 (14)

[7] Exchange bias effect in CoFe2O4-Cr2O3 nanocomposite embedded in SiO2 matrix [J].

Borgohain, Chandan ;

Mishra, Debabrata ;

Sarma, K. C. ;

Phukan, Prodeep .

JOURNAL OF APPLIED PHYSICS, 2012, 112 (11)

[8] Thin films of Co1.7Fe1.3O4 prepared by radio frequency sputtering - the first step towards their spinodal decomposition [J].

Bui, T. M. A. ;

Le Trong, H. ;

Presmanes, L. ;

Barnabe, A. ;

Bonningue, C. ;

Tailhades, P. .

CRYSTENGCOMM, 2014, 16 (16) :3359-3365

[9] K-edge x-ray absorption spectra in transition-metal oxides beyond the single-particle approximation: Shake-up many-body effects [J].

Calandra, M. ;

Rueff, J. P. ;

Gougoussis, C. ;

Ceolin, D. ;

Gorgoi, M. ;

Benedetti, S. ;

Torelli, P. ;

Shukla, A. ;

Chandesris, D. ;

Brouder, Ch .

PHYSICAL REVIEW B, 2012, 86 (16)

[10] Simple models for dynamic hysteresis loop calculations of magnetic single-domain nanoparticles: Application to magnetic hyperthermia optimization [J].

Carrey, J. ;

Mehdaoui, B. ;

Respaud, M. .

JOURNAL OF APPLIED PHYSICS, 2011, 109 (08)

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