Effect of pressure of pelletization on dielectric properties of Bismuth Titanate prepared by sol-gel synthesis

Badge, Shraddha K.; Deshpande, A. V.

doi:10.1016/j.apt.2017.11.011

Cited by 10 publications

(2 citation statements)

References 25 publications

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“…This is indeed what is observed for example in work of Meng-Meng and co-workers relating to pressure pellet influence on the dielectric properties of titanium compound/polymer composite nanofibers [33]. Similarly, a significant effect of pellet pressure on the dielectric response occurred at lower frequencies below kHz on sol-gel prepared Bismuth titanate ceramics [34]. The opposite trend observed in our work therefore excludes this possibility.…”

Section: Resultssupporting

confidence: 91%

Significance of considering pellet molding pressure and dielectric experimental conditions in the [dielectric constant—temperature] response of switchable dielectric molecular materials: illustration on dabcoHBF4 polycrystals

et al. 2021

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In this study, we investigate the temperature-dependent dielectric response of dabcoHBF4 molecular switchable dielectric materials. This compound made of polycrystals has been shaped into pellets under different controlled applied pressures [0.2-1 GPa]. The dielectric analysis carried out on these samples showed that the mechanical stresses induced by this shaping pressure had a significant effect on the value of the dielectric constant in both the ferroelectric and the paraelectric phase. However, the impact of this pressure remains secondary in the AC electrical conductivity, determined for the first time in these compounds. Thus, conductivity values around 2x10 -7 S/cm in the ferroelectric phase and 2x10 -6 S/cm in the paraelectric phase were found. The behavior of these compounds over wide frequency ranges [1-1 MHz] and temperature ramps [0.5-10 K/min] revealed that the frequency had no effect on the transition temperature at the difference of temperature rate as expected in most ferroelectric materials. When decreasing the frequency, the dielectric constant gains in value and can reach values higher than 50 in the ferroelectric phase and 1000 in the paraelectric phase with a frequency solicitation at 10 Hz.At lower frequencies, the Curie-Weiss law is lost in the paraelectric regime and an enhanced rise of the dielectric constant with increasing temperature probably reflects an interfacial polarization mechanism. Finally, this dielectric analysis in frequency, temperature (323-403 K) and along temperature ramps allowed to extract analytical laws of behavior associating some of these parameters. For example, one of these equations will be useful in the choice of the temperature ramp to be applied to optimize the switching time between a ferroelectric and a paraelectric state according to a condition on the value of the desired dielectric constant at the low and high states in the implementation of memories.

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Section: Resultssupporting

confidence: 91%

Significance of considering pellet molding pressure and dielectric experimental conditions in the [dielectric constant—temperature] response of switchable dielectric molecular materials: illustration on dabcoHBF4 polycrystals

et al. 2021

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show abstract

“…Both samples display equiaxial grains with no formations that could resemble secondary phases, in agreement with the observations from the XRD results. A calcination at 700 °C is significantly lower than the typical temperature used to obtain single-phase BiT ceramics [11,12,[38][39][40][41][42]13,14,16,[18][19][20]22,34]. Lowering the temperature of thermal J o u r n a l P r e -p r o o f treatments for BiT is important to mitigate bismuth volatilisation, and to also enable the abatement of the energetic impact in the material´s synthesis.…”

Section: Figure 1dmentioning

confidence: 99%