Effect of zinc doping on magnetic and magnetoelastic properties of cobalt ferrite synthesized by autocombustion process

Reddy, Monaji Vinitha; Praveen, J. Paul; Das, Dibakar

doi:10.1063/1.4810577

Cited by 8 publications

(3 citation statements)

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“…DSC curve shows an onset of thermal changes at 1293°C and a sharp melting peak at 1355°C. 26,29 Equal weight fractions of BCZT and CFO were mixed and milled together initially and subjected to sintering at 1300°C. Sintering temperature of pure BCZT is ≥1450°C to achieve a density >90%, 28 whereas for pure CFO it is~1300°C to achieve density >90% of its theoretical density.…”

Section: Resultsmentioning

confidence: 99%

“…Sintering temperature of pure BCZT is ≥1450°C to achieve a density >90%, 28 whereas for pure CFO it is~1300°C to achieve density >90% of its theoretical density. 26,29 Equal weight fractions of BCZT and CFO were mixed and milled together initially and subjected to sintering at 1300°C. Sintering temperature above 1300°C resulted in formation of extra phases such as, cobalt titanate (CoTiO 3 ), calcium cobaltite (Ca 3 Co 2 O 6 ), and barium ferrite (BaFe 12 O 19 ) resulted in the melting of the composite at 1350°C.…”

Section: Resultsmentioning

confidence: 99%

“…Synthesis of CFO using the auto combustion technique is explained in detail elsewhere. 29,30 CFO precursor powders were also calcined at 1400°C for 2 hours separately to obtain complete phase formation and also to suppress its reactivity. The calcined powders were subjected to ball milling in a planetary ball mill (Fritsch Pulverisette 7) for 2 hours to reduce the increased particle sizes evolved due to calcination at higher temperature (1400°C).…”

Section: Methodsmentioning

confidence: 99%

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Synthesis, characterization, and magneto‐electric properties of (1−x)BCZT‐xCFO ceramic particulate composites

Praveen

Reddy

Kolte

et al. 2016

Int J Applied Ceramic Tech

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Synthesis of a new magnetoelectric [(1−x)(Ba0.85Ca0.15)(Zr0.1Ti0.9)O3‐xCoFe2O4] (weight fraction x=0, 0.1, 0.2, 0.3, 0.4, 0.5 and 1) ceramic particulate composites with its structural characterization and magneto‐electric properties have been reported here in this study. Lead free piezoelectric (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) and ferrimagnetic CoFe2O4 (CFO) were synthesized using sol‐gel and combustion methods respectively. (1−x)BCZT‐xCFO magnetoelectric composites were then synthesized by mixing of the calcined individual ferroic phases with required weight fractions. Powder X‐ray diffraction studies indicate the coexistence of BCZT and CFO phases in the composites sintered at 1300°C. 0.5BCZT‐0.5CFO composite showed high strain sensitivity (dλ/dH) of 52×10−9 Oe−1, which is comparable to that of pure CFO (50×10−9 Oe−1). A high piezoelectric voltage constant (g33) of 8×10−3 V m/N was measured for 0.8BCZT‐0.2CFO sample. All the composites showed magnetoelectric effect and a high magnetoelectric coupling coefficient (αME) of 6.85 mV/cm Oe was measured for 0.5BCZT‐0.5CFO composite at 1 kHz and a large ME coefficient of 115 mV/cm Oe at its resonance frequency. The effect of microstructure on the magnetoelectric properties of [(1−x)BCZT‐(x)CFO] composites has been studied and reported here as a function of its piezoelectric (BCZT)/ferrite (CoFe2O4) content.

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Section: Resultsmentioning

confidence: 99%