Simple Process Synthesis of BaTiO3–(Ni,Zn,Cu)Fe2O4 Ceramic Composite

Kamishima, K.; Nagashima, Yoshitaka; Kakizaki, Koichi; Hiratsuka, Nobuyuki; Watanabe, Kojiro; Mise, Takaya; Naganuma, Hiroshi; Okamura, Soichiro

doi:10.1143/jpsj.77.064801

Cited by 14 publications

(12 citation statements)

References 21 publications

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“…[28][29][30][31][32][33][34][35][36] This is, however, slightly complicated since it is the sum of two syntheses for spinel ferrite and insulator materials. 37,38) In this study, previously-unreported BaTiO 3 /Fe 3 O 4 composites where BaTiO 3 was employed as the insulating barriers were prepared using a direct solid-state reaction of raw materials (BaCO 3 , TiO 2 , and Fe 3 O 4 ). The magnetic behavior and MR properties are discussed in relation to the molar fraction x between Fe 3 O 4 and BaTiO 3 in order to clarify the effect of the insulating BaTiO 3 matrix.…”

Section: )mentioning

confidence: 99%

Tunneling magnetoresistance in BaTiO3/Fe3O4 composites

Noshiro

Kamishima

Kakizaki

et al. 2012

Trans. Mat. Res. Soc. Japan

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(1-x)BaTiO 3 -xFe 3 O 4 composites were successfully prepared by conventional solid-state sintering of raw materials (BaCO 3 , TiO 2 , and Fe 3 O 4 ) in the molar fraction x of Fe 3 O 4 to BaTiO 3 at 1323 K for 5 hours under Ar gas flow. X-ray diffraction (XRD) and electron probe micro analysis (EPMA) measurements were performed for these samples and it is confirmed that the composites consist of only two phases of

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Section: )mentioning

confidence: 99%

Tunneling magnetoresistance in BaTiO3/Fe3O4 composites

Noshiro

Kamishima

Kakizaki

et al. 2012

Trans. Mat. Res. Soc. Japan

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“…The mixture of BT and BZ results in the increase in entropy of BTZ ceramics. [Kamishima et al, 2008] This increase of entropy gives the decrement of Gibbs free energy. [Kamishima et al, 2008] Therefore, the coexistence of cubic and tetragonal phases of BZT is possible.…”

Section: Structure Analysismentioning

confidence: 99%

“…[Kamishima et al, 2008] This increase of entropy gives the decrement of Gibbs free energy. [Kamishima et al, 2008] Therefore, the coexistence of cubic and tetragonal phases of BZT is possible. Owing to the limitations of XRD, the simulation of the Rietveld method should prove to be a powerful tool both for determining the existence of the cubic phase and for reducing inaccuracies in the lattice determination.…”

Section: Structure Analysismentioning

confidence: 99%

Evaluation on Structure Modification and Properties of (Ba1-xSrx)(Ti1-y Zry)O3 Ceramics by using Rietveld Method

Huang¹,

Chiu²,

Wu³

et al. 2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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“…According to Maxwell's relation of ( ¶S/ ¶V) T = ( ¶P/ ¶T) V , the mixture of BT and BZ results in the increase in entropy of BZT ceramics, where S, V, P, and T are entropy, volume, pressure, and temperature. [14] This increase of entropy gives the decrement of Gibbs free energy: G = G 0 -TDS, where G 0 is the Gibbs free energy before mixing. [14] Therefore, the coexistence of cubic and tetragonal phases of BZT is possible.…”

Section: A the Structure Of Bzt Ceramicsmentioning

confidence: 99%

“…[14] This increase of entropy gives the decrement of Gibbs free energy: G = G 0 -TDS, where G 0 is the Gibbs free energy before mixing. [14] Therefore, the coexistence of cubic and tetragonal phases of BZT is possible. Owing to the limitations of XRD, the simulation of the Rietveld method should prove to be a powerful tool both for determining the existence of the cubic phase and for reducing inaccuracies in the lattice determination.…”

Section: A the Structure Of Bzt Ceramicsmentioning

confidence: 99%

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

Huang

Chiu

et al. 2008

Metall Mater Trans A

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Ti 12x )O 3 (x = 0, 0.05, 0.1, and 0.15, BZT for short) has been prepared using the solid solution reaction from BaTiO 3 (BT) and BaZrO 3 (BZ). For transmission electron microscopy (TEM) analysis, the cubic phase of BZT coexists with the tetragonal one in the Ba(Zr 0.15 Ti 0.85 )O 3 ceramics. Its structure of ceramics has been estimated using the Rietveld and Cohen methods. The effect of BaZrO 3 content on the tetragonality of BZT and its relation to a dielectric constant have been studied, and it is found that the tetragonality approaches 1 as the BZ content is increased, while simultaneously the Curie temperature of BZT decreases at a rate of 4.66°C per mole pct BZ. The average grain size was sensitive to the BZ content, and the P r could be enhanced at room temperature.

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Simple Process Synthesis of BaTiO₃–(Ni,Zn,Cu)Fe₂O₄ Ceramic Composite

Cited by 14 publications

References 21 publications

Tunneling magnetoresistance in BaTiO<sub>3</sub>/Fe<sub>3</sub>O<sub>4</sub> composites

Tunneling magnetoresistance in BaTiO<sub>3</sub>/Fe<sub>3</sub>O<sub>4</sub> composites

Evaluation on Structure Modification and Properties of (Ba1-xSrx)(Ti1-y Zry)O3 Ceramics by using Rietveld Method

Tetragonality and Properties of Ba(Zr x Ti1−x )O3 Ceramics Determined Using the Rietveld Method

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