High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics

Acosta, Matias; Zang, Jiadong; Jo, Wook; Rödel, Jürgen

doi:10.1016/j.jeurceramsoc.2012.06.011

Cited by 169 publications

(108 citation statements)

References 51 publications

(67 reference statements)

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“…The peak at 262 °C, identified as T m [14][15][16], and does not correspond to any structural phase Zero-force TMA reveals no visible change in the thermal expansion (~10 ppm °C -1 ) of unpoled BNT-7BT from 25 °C to 400 °C (Fig. 4(c)).…”

Section: Bnt-7btmentioning

confidence: 97%

“…It was speculated that these compositions exhibit an antiferroelectric state above the so-called thermal depolarization temperature [14] and their utilization in hightemperature capacitor applications was explored [16]. However, recently it was clarified that this antiferroelectric phase is actually a relaxor ferrielectric phase [10,17,18].…”

Section: Introductionmentioning

confidence: 99%

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Thermal analysis of phase transitions in perovskite electroceramics

Young

Guo

et al. 2013

J Therm Anal Calorim

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Perovskite oxide ceramics have found wide applications in energy storage capacitors, electromechanical transducers, and infrared imaging devices due to their unique dielectric, piezoelectric, pyroelectric, and ferroelectric properties. These functional properties are intimately related to the complex displacive phase transitions that readily occur. In this study, these solid-solid phase transitions are characterized with dielectric measurements, dynamic mechanical analysis, thermomechanical analysis, and differential scanning calorimetry in an antiferroelectric lead-containing composition, Pb0.99Nb0.02 [(Zr0.57Sn0.43)0.92Ti0.08]0.98O3, and in a relaxor ferrielectric lead-free composition, (Bi1/ 2Na1/2)0.93Ba0.07TiO3. The (Bi1/2Na1/2)0.93Ba0.07TiO3 ceramic develops strong piezoelectricity through electric field-induced phase transitions during the poling process. The combined thermal analysis techniques clearly reveal the differences in unpoled and poled ceramics.

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Section: Bnt-7btmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Thermal analysis of phase transitions in perovskite electroceramics

Young

Guo

et al. 2013

J Therm Anal Calorim

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“…The cause of this dual nature of the ECE in the same material at different temperatures may be the transition as reported by Axelsson et al 13 In order to stabilize either form of the ECE in the 0.94BNT-0.06BT ceramics the relevant phase transitions must be unified to one phase transition or the transition temperature difference between the ferroelectric-to-antiferroelectric (FE-to-AFE) and antiferroelectric-to-paraelectric (AFE-to-PE) phase transitions must be decreased via specific doping; consequently, the phase transition behaviors of 0.94BNT-0.06BT ceramics with different doping have been investigated in previous studies. [14][15][16][17] In this work, Ba 1/2 Sr 1/2 TiO 3 (BST) has been used as a probe to investigate the cause of the coexistence of ECE with opposite signs and to look for a possible way to unify the ECE as either positive or negative type. Dielectric and mechanical relaxation analyses are employed to elucidate the effect of BST doping on the structural and EC properties of BNT-BT-BST.…”

Section: Introductionmentioning

confidence: 99%

Unification of the negative electrocaloric effect in Bi1/2Na1/2TiO3-BaTiO3 solid solutions by Ba1/2Sr1/2TiO3 doping

Uddin

Zheng

Iqbal

et al. 2013

Journal of Applied Physics

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The microscopic mechanisms of the negative electrocaloric effect (ECE) of the single-phase (1Àx)(0.94Bi 1/2 Na 1/2 TiO 3 -0.06BaTiO 3 )-xBa 1/2 Sr 1/2 TiO 3 (BNT-BT-BST) perovskite solid solutions fabricated via the sol-gel technique are explored in this study. Dielectric and mechanical relaxation analyses are employed to investigate the ferroelectric and structural transitions of the samples. The electrocaloric properties of the samples were measured by thermodynamics Maxwell relations. The difference between the depolarization temperature (T d ) and the maximum dielectric constant temperature (T m ) was found to decrease with increasing BST content. Doping with BST stabilized the ferroelectric phase along with unifying the EC temperature changes (DT) to only negative values. The origin of the uniform negative ECE of BNT-BT-BST is discussed. V C 2013 AIP Publishing LLC. [http://dx

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“…In the NBT-BT-KNN-CZ system, the flattest r-T response again occurred for x = 0.2CZ [51]. In this case, the temperature range of ±15% consistency in r (467 mean) extended from -69ºC to + 468ºC; dielectric loss at 1 kHz (tan = r / r ) increased sharply above 300ºC.…”

Section: Na05bi05tio3-batio3-k05na05nbo3mentioning

confidence: 90%

“…The effect of incorporating CaZrO3 into NBT-BT and NBT-BT-KNN was to decrease the lower operating temperature and also to decrease r values [51,52]. The materials were prepared according to solid solution formulae: (1-x)[0.94Na0.5Bi0.5TiO3-0.06BaTiO3]-xCaZrO3 and (1-x)[0.82(0.94Na0.5Bi0.5TiO3-0.06BaTiO3)-0.18K0.5Na0.5NbO3]-xCaZrO3 respectively.…”

Section: Na05bi05tio3-batio3-k05na05nbo3mentioning

confidence: 99%

High temperature dielectric ceramics: a review of temperature-stable high-permittivity perovskites

Zeb

Milne

2015

J Mater Sci: Mater Electron

147

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Recent developments are reviewed in the search for dielectric ceramics which can operate at temperatures > 200ºC, well above the limit of existing high volumetric efficiency capacitor materials. Compositional systems based on lead-free relaxor dielectrics with mixed cation site occupancy on the perovskite lattice are summarised, and properties compared. As a consequence of increased dielectric peak broadening and shifts to peak temperatures, properties can be engineered such that a plateau in relative permittivity-temperature response ( r-T) is obtained, giving a ±15%, or better, consistency in r over a wide temperature range. Materials with extended upper temperature limits of 300°C, 400°C and indeed 500°C are grouped in this article according to the parent component of the solid solution, for example BaTiO3 and Na0.5Bi0.5TiO3. Challenges are highlighted in achieving a lower working temperature of -55°C, whilst also extending the upper temperature limit of stable r to ≥ 300°C, and achieving high-permittivity and low values of dielectric loss tangent, tan . Summary tables and diagrams are used to help compare values of r, tan , and temperature ranges of stability for different materials.

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High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics

Cited by 169 publications

References 51 publications

Thermal analysis of phase transitions in perovskite electroceramics

Thermal analysis of phase transitions in perovskite electroceramics

Unification of the negative electrocaloric effect in Bi1/2Na1/2TiO3-BaTiO3 solid solutions by Ba1/2Sr1/2TiO3 doping

High temperature dielectric ceramics: a review of temperature-stable high-permittivity perovskites

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