Effect of microwave sintering on the microstructure and electric properties of (Zn,Mg)TiO3-based multilayer ceramic capacitors

Lee, Ying-Chieh; Yeh, Yu-Yuan; Tsai, Pei-Rong

doi:10.1016/j.jeurceramsoc.2011.12.025

Cited by 29 publications

(3 citation statements)

References 26 publications

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“…The diffraction peaks shifted monotonically to low 2h angles with increasing x. According to the principles of crystal chemistry relating to element doping positions in ABO 3 structure reported by Lee et al[24] and Morrison et al[25], iridium generally occupied the B sites. Thus, the shift in the position of the diffraction peaks was attributed to the decreased interplanar spacing owing to the substitution of Zr 4?…”

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confidence: 76%

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

et al. 2015

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Lead-free ceramics 0.5Ba 0.7 Ca 0.3 TiO 3 -0.5BaTi 0.8 Zr 0.2 O 3 -xIrO 2 (x = 0-1.2 %) were prepared at a low temperature of 1260°C via sintering the as-synthesized nanoparticles, which were synthesized by a modified Pechini polymeric precursor method. All samples featured high levels of densification under the synthesis conditions; particularly, the ceramic prepared at IrO 2 content of 0.4 % achieved the highest relative density (*97.4 %). Phase transition from tetragonal to orthorhombic and a polymorphic phase transition (PPT) region were observed, which were influenced by the IrO 2 content. The dielectric properties, temperature coefficient of capacitance, ferroelectric properties, and piezoelectric properties as a function of IrO 2 content were thoroughly studied. Optimal electrical properties (remnant polarization, piezoelectric constant, and planar electromechanical coupling factors, i.e., P r = 6.28 lC/cm 2 , d 33 = 199 pC/N, and k p = 0.258) were obtained around the PPT region. The findings of the ceramic electrical properties by IrO 2 doping are believed to be insightful in the development of lead-free dielectric and ferroelectric materials.

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confidence: 76%

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

et al. 2015

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“…Microwave sintering is useful for the development of smaller grain-sized and uniform microstructures in ceramics. Also, the microwavesintering technique is a well known technique for enhancement of density in ceramic materials with very rapid heating rate which shows similarities in improving the electrical, structural, microstructural and mechanical properties of ceramic compositions [12][13][14][15][16]. Although the possibility of processing ceramics by microwave heating was discussed over 50 years ago, this method was used only in the past decades and only few reports on ceramic processing with microwave-sintering method are available.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted sintering and improved dielectric, ferroelectric properties of 0.5[(Ba_0.7Ca_0.3)TiO₃]–0.5[Ba(Zr_0.2Ti_0.8)O₃] lead-free ceramics

Mane

Tirmali

Kadam

et al. 2017

Advances in Applied Ceramics

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0.5[(Ba 0.7 Ca 0.3 )TiO 3 ]-0.5[Ba(Zr 0.2 Ti 0.8 )O 3 ] lead-free ceramics were synthesised by coprecipitation method and sintered by fast microwave sintering (MWS) and by conventional sintering (CS) at 1200°C. After being sintered with the two different methods, the materials were characterised for structural, microstructural, frequency and temperature-dependent dielectric properties, Raman spectroscopy, and ferroelectric measurements. Results are compared and discussed in the present paper. X-ray diffraction confirms the presence of the tetragonal and rhombohedral phases in the composites sintered by both methods. The ferroelectric to paraelectric transition temperature (Tc) is increased in microwave-sintered composite. Diffuse constant (γ) values show BCT-BZT ceramics to be neither normal ferroelectrics nor relaxor ferroelectrics. Raman spectra confirm phase transition in the ceramic samples. Saturation polarisation (Ps) values are 7.62 and 4.28 µC cm −2 and nearly equal remanant polarisation (Pr) values were observed for BCT-BZT composite sintered with MWS and CS, respectively.

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“…Therefore, once the interaction mechanisms between microwave and matter are revealed, it will hopefully be possible to regulate the performance of the product. However, microwave sintering is a complex and variable process, because not only does microwave act on matter, but matter also influences the microwave in return [11,12,13,14,15,16]. For example, Birnboim et al indicated that the sintering neck would lead to the focusing of the microwave field [17]; Rybakov et al showed that the direction of the microwave electric field could influence the shape of the pores [18].…”

Section: Introductionmentioning

confidence: 99%

Discussion on Microwave-Matter Interaction Mechanisms by In Situ Observation of “Core-Shell” Microstructure during Microwave Sintering

et al. 2016

Materials

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This research aims to deepen the understanding of the interaction mechanisms between microwave and matter in a metal-ceramic system based on in situ synchrotron radiation computed tomography. A special internal “core-shell” microstructure was discovered for the first time and used as an indicator for the interaction mechanisms between microwave and matter. Firstly, it was proved that the microwave magnetic field acted on metal particles by way of inducing an eddy current in the surface of the metal particles, which led to the formation of a “core-shell” microstructure in the metal particles. On this basis, it was proposed that the ceramic particles could change the microwave field and open a way for the microwave, thereby leading to selective heating in the region around the ceramic particles, which was verified by the fact that all the “core-shell” microstructure was located around ceramic particles. Furthermore, it was indicated that the ceramic particles would gather the microwaves, and might lead to local heating in the metal-ceramic contact region. The focusing of the microwave was proved by the quantitative analysis of the evolution rate of the “core-shell” microstructure in a different region. This study will help to reveal the microwave-matter interaction mechanisms during microwave sintering.

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Effect of microwave sintering on the microstructure and electric properties of (Zn,Mg)TiO3-based multilayer ceramic capacitors

Cited by 29 publications

References 26 publications

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

Microwave-assisted sintering and improved dielectric, ferroelectric properties of 0.5[(Ba_0.7Ca_0.3)TiO₃]–0.5[Ba(Zr_0.2Ti_0.8)O₃] lead-free ceramics

Discussion on Microwave-Matter Interaction Mechanisms by In Situ Observation of “Core-Shell” Microstructure during Microwave Sintering

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Effect of microwave sintering on the microstructure and electric properties of (Zn,Mg)TiO3-based multilayer ceramic capacitors

Cited by 29 publications

References 26 publications

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

Microwave-assisted sintering and improved dielectric, ferroelectric properties of 0.5[(Ba0.7Ca0.3)TiO3]–0.5[Ba(Zr0.2Ti0.8)O3] lead-free ceramics

Discussion on Microwave-Matter Interaction Mechanisms by In Situ Observation of “Core-Shell” Microstructure during Microwave Sintering

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Microwave-assisted sintering and improved dielectric, ferroelectric properties of 0.5[(Ba_0.7Ca_0.3)TiO₃]–0.5[Ba(Zr_0.2Ti_0.8)O₃] lead-free ceramics