Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo‐Ferroelectric Materials

Hungrı́a, Teresa; Galy, Jean; Castro, A.

doi:10.1002/adem.200900052

Cited by 168 publications

(102 citation statements)

References 148 publications

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“…Thus, the sintering of Sr 1 x (Na 0.5 Bi 0.5 ) x Bi 2 Nb 2 O 9 ceramics is completed at the low temperature of 800 . It is well known that the process of sintering has three stages [41][42][43]: the initial, the intermediate, and the final one. In the initial stage, the green body has a low density and is generally lacking in physical integrity.…”

Section: 1 Densificationmentioning

confidence: 99%

Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions

Naceur¹,

Megriche²,

Maaoui³

2014

J Adv Ceram

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Abstract:In this study, we investigated the effect of sintering temperature on densification, grain size, conductivity and dielectric properties of Sr 1 x (Na 0.5 Bi 0.5 ) x Bi 2 Nb 2 O 9 ceramics, prepared by hydrothermal method. Pellets were sintered at different temperatures. Density increased with sintering temperature, reaching up to 96% at 800 . A grain growth was observed with increasing sintering temperature. Impedance spectroscopy analyses of the sintered samples at various temperatures were performed. Increase in dielectric constant and in Curie temperature with sintering was discussed. Electrical conductivity and activation energy were calculated and attributed to the microstructural factors.

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Section: 1 Densificationmentioning

confidence: 99%

Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions

Naceur¹,

Megriche²,

Maaoui³

2014

J Adv Ceram

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“…Spark plasma sintering (SPS) or pulsed electric current sintering (PECS) technique is also a powerful methodology to sinter ZnO varistors. [134][135][136][137][138] SPS combines the application of both pressure and pulsed DC current directly on the ceramic sample. [134][135][136] The low-voltage DC pulse transiently produces spark plasma at high temperatures between particles.…”

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confidence: 99%

Advances in the synthesis of ZnO nanomaterials for varistor devices

et al. 2013

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adZnO based varistors are widely used for overvoltage protection in many electrical and electronic circuits, at voltages ranging from a few to over a million volts. By careful control of the microstructure, through nanostructuring by chemical routes, it should be possible to produce varistors with high breakdown voltage (V c ), as this is proportional to the number of active grain boundaries in the sintered body. This property is particularly important for the production of the small-sized varistors needed for modern electronic instruments such as tablet computers and mobile phones. The current review will outline the recent advances in the chemical processing (e.g. sol-gel, combustion synthesis plasma pyrolysis, micro-emulsion synthesis and precipitation routes) of varistors from ZnO nanomaterials and the properties of these materials. Uncontrolled grain growth at higher temperature is highlighted as a major challenge for obtaining desirable electrical properties for nano-varistors. Various novel sintering techniques such as step-sintering, spark plasma and microwave sintering methods are expected to deliver a varistor with controlled grain growth and optimum electrical characteristics.

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“…This is possible due to the heating mechanism. In this method, a very high electric current is passed through the sample and pressure is applied simultaneously, and liquid phase is generated rapidly which assist the densification, but for more details the reader is encouraged to revise some specialized publications on the subject (Hungría et al, 2009;Tokita, 1993). This sintering method allows reducing the loss of alkaline elements because of the low sintering temperature and short holding time; nevertheless, additional heat treatment is required to eliminate oxygen vacancies (Abe et al, 2007;Wang et al, 2007).…”

Section: Spark Plasma Sinteringmentioning

confidence: 99%