Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6

Patro, P.K.; Kulkarni, Ajit R.; Gupta, S. C.; Harendranath, C.S.

doi:10.1016/j.physb.2007.07.022

Cited by 27 publications

(8 citation statements)

References 19 publications

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“…The calcined sample was palletized into disc using polyvinyl alcohol as binder. Finally, the discs were sintered using platinum crucible at optimized temperature 1300°C for 4 h. [29]. The bulk density of ceramics was measured by using Archimedes method by knowing the pellet weight using a digital balance Sartorius, model BP2215, USA, in air (W a ); weight in buoyant (W b ) and the density of buoyant (ρ b ).…”

Section: Methodsmentioning

confidence: 99%

Citrate–nitrate Derived Sr0.5Ba0.5Ta2O6 Tetragonal Tungsten Bronze Nanorods: Investigation Of Their Optical And Dielectric Properties

Sharma

Kumar²,

Sharma³

et al. 2012

Adv. Mater. Lett.

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First time novel complex strontium barium tantalate, Sr 0.5 Ba 0.5 Ta 2 O 6 was successfully synthesized in 1D structure (nanorods) by citrate-nitrate gel route. Their structural properties were examined via X-ray diffractometry (XRD) and revealed the formation of tetragonal tungsten bronze (TTB) structure at as low as 1100ºC. Also, FT-IR, FT-Raman, UV-vis, SEM, TEM and PL were used to identify the structure and properties of powders. Well isolated nanorods of the average diameter of ~200nm can be fabricated by this route. PL spectrum showed strong and broad visible emission band around 439nm due to particles with little surface defects. The frequency dependent dielectric dispersion of SBT50 powders sintered at 1300°C/4 h was investigated in a frequency range from 1 kHz-1MHz and at different temperatures (25°C-450°C). It is observed that: (i) the dielectric constant (ε') and loss tangent (tan δ) are dependent on frequency, (ii) the temperature of dielectric constant maximum shift toward lower temperature side and the maximum dielectric constant (ε) was observed to be 2400 at 1 kHz. The T c was found to be ~444-449°C and ferroelectric relaxor or diffuse phase transition like behavior was observed at around 449°C.

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Section: Methodsmentioning

confidence: 99%

Citrate–nitrate Derived Sr0.5Ba0.5Ta2O6 Tetragonal Tungsten Bronze Nanorods: Investigation Of Their Optical And Dielectric Properties

Sharma

Kumar²,

Sharma³

et al. 2012

Adv. Mater. Lett.

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“…The maximum losses are 0.015, 0.02 and 0.04, at 1, 10 and 100 kHz respectively, which are much lower than that of other researchers. 9 It shows that the appropriate amount of sintering additive does not affect the dielectric loss dramatically.…”

Section: Microstructurementioning

confidence: 98%

“…5,6 However, the high-density SBN ceramics are difficult to obtain because of the abnormal grain growth. 7 Researches have been done to improve the density of SBN in many ways, such as dual-stage sintering, 8 hot pressing, 9 reaction singtering 10 and atmosphere sintering 11 etc. For instance, the relative density of SBN synthesized by partial coprecipitation method 12 could reach 92.25% by sintered at 1300 • C for more than 24 h. With high purity starting powders, SBN sample with a high relative density (∼98.7%) could be obtained by reaction sintering in oxygen atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Effect of silica sintering additive on the sintering behavior and dielectric properties of strontium barium niobate ceramics

Wang

Sui

et al. 2009

Journal of the European Ceramic Society

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“…The direct interaction or coupling between microwaves and the material is responsible for the rapid and internal heating, which makes the energy conversion rather than energy transfer, and as a consequence volumetric heating occurs. The volumetric heating is one of the possible reasons for improvement in microstructure and hence the dielectric and magnetic properties of the materials [1,2].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique

Reddy¹,

Kim²,

Yoo³

et al. 2012

MSA

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The low-temperature sintered NiZn and NiCuZn ferrites with the composition of Ni0.40Zn0.60Fe2O4 and Ni0.35Cu0.05Zn0.60 Fe2O4 were respectively synthesized by the microwave sintering method. These powders were calcined, compacted and sintered at 950℃ for 30 min. X-ray diffraction (XRD) patterns of the samples indicate the formation of single-phase cubic spinel structure. The grain size was estimated from SEM images which increase with CuO addition. The X-ray density is higher than the bulk density in both the ferrites. The temperature variation of the initial permeability of these samples was carried out from 30℃ to 250℃. The NiCuZn ferrite had higher initial permeability than that of the NiZn ferrite, which could be attributed to the microstructure. Saturation magnetization increases from 40 emug/g (NiZn) to 47 emug/g (NiCuZn). The dielectric constant and dielectric loss tangent of NiZn and NiCuZn ferrite samples decreases with increase in frequency exhibiting normal ferrimagnetic behavior. The NiCuZn ferrite had better electro- magnetic properties than the NiZn ferrite

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Improved microstructure, dielectric and ferroelectric properties of microwave-sintered Sr0.5Ba0.5Nb2O6

Cited by 27 publications

References 19 publications

Citrate–nitrate Derived Sr0.5Ba0.5Ta2O6 Tetragonal Tungsten Bronze Nanorods: Investigation Of Their Optical And Dielectric Properties

Citrate–nitrate Derived Sr0.5Ba0.5Ta2O6 Tetragonal Tungsten Bronze Nanorods: Investigation Of Their Optical And Dielectric Properties

Effect of silica sintering additive on the sintering behavior and dielectric properties of strontium barium niobate ceramics

Characterization and Electromagnetic Studies on NiZn and NiCuZn Ferrites Prepared by Microwave Sintering Technique

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