Highly efficient and giant negative electrocaloric effect of a Nb and Sn co-doped lead zirconate titanate antiferroelectric film near room temperature

The electrical behavior of modified soft lead zirconate titanate (PZT) ceramics has been studied as a function of temperature at different direct current (dc) electric fields and grain sizes. As ferroelectrics, such as PZT, are highly polarizable materials, poling, depolarization, and electric conduction contribute to the total electrical current, which leads to anomalous electrical behavior as a function of temperature. The PZT appeared to have a high pyroelectric coefficient, and it was found that the displacement current hides the conduction current near room temperature. The (long-time) steady-state electrical resistivity of the soft PZT used has a typical, relatively high value of 3.6 × 1012 Ω·cm near room temperature. The resistivity above the Curie temperature was two orders of magnitude lower than the room temperature. The resistivity decreases with increasing grain size probably due to the increased Pb vacancy concentration resulting as a consequence of a higher sintering temperature. The values of activation energies suggest that the charge carriers at high temperature are mainly oxygen vacancies. At intermediate temperature, the electrical behavior is controlled by the counteracting effect of depolarization and conduction. Considering the pyroelectric effect and the conduction, it was thus possible to explain the electrical behavior of this soft PZT ceramic over the temperature range considered.

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Lead Zirconate Titanate Via Reaction Sintering of Hydroxide Precursors

Journal of Materials Research ◽

10.1557/jmr.1999.0201 ◽

1999 ◽

Vol 14 (4) ◽

pp. 1503-1509 ◽

Cited By ~ 6

Author(s):

Xue Junmin ◽

John Wang

Keyword(s):

High Temperature ◽

Lead Zirconate Titanate ◽

Room Temperature ◽

Sintered Density ◽

Nitrate Solution ◽

Lead Zirconate ◽

Processing Route ◽

Sintering Behavior ◽

Zirconate Titanate ◽

One Step

Lead zirconate titanate (PZT) has been successfully fabricated via a unique one-step sintering processing route, which is simpler than the traditional precursor-calcinationmilling- pelleting-sintering route and is able to deliver an enhanced sintered density at a much reduced sintering temperature. The hydroxide precursor was prepared by coprecipitation from a mixed nitrate solution containing Pb2+, Zr4+, and Ti4+ ions, and it was then compacted into pellets without being calcined at a low temperature. The precursor pellets were dehydrated at 400, 500, and 600 °C for 4 h, respectively, followed by an isostatic pressing at 350 MPa, prior to being sintered at a high temperature. Dehydration temperature has a large impact on the sintering behavior of these hydroxide-derived PZT ceramics. The PZT dehydrated at 400 °C was seriously cracked when sintered at temperatures ranging from 950 to 1150 °C, due to the incomplete dehydration. A sintered density of 99.2% theoretical density was obtained at 1050 °C for 2 h for the powder pellet dehydrated at 500 °C for 4 h. It exhibits a dielectric constant of 1024 and a dielectric loss of 2.1% at a frequency of 1 kHz at room temperature. A calcination at a too-high temperature, e.g., 600 °C, results in a reduction in the sinterability of the precipitate-derived PZT ceramic.

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Symmetries and multiferroic properties of novel room-temperature magnetoelectrics: Lead iron tantalate – lead zirconate titanate (PFT/PZT)

AIP Advances ◽

10.1063/1.3670361 ◽

2011 ◽

Vol 1 (4) ◽

pp. 042169 ◽

Cited By ~ 86

Author(s):

Dilsom A. Sanchez ◽

N. Ortega ◽

Ashok Kumar ◽

R. Roque-Malherbe ◽

R. Polanco ◽

...

Keyword(s):

Lead Zirconate Titanate ◽

Room Temperature ◽

Lead Zirconate ◽

Multiferroic Properties ◽

Zirconate Titanate

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Large Electrocaloric Effect in Relaxor Ferroelectric and Antiferroelectric Lanthanum Doped Lead Zirconate Titanate Ceramics

Scientific Reports ◽

10.1038/srep45335 ◽

2017 ◽

Vol 7 (1) ◽

Cited By ~ 60

Author(s):

Biao Lu ◽

Peilian Li ◽

Zhenhua Tang ◽

Yingbang Yao ◽

Xingsen Gao ◽

...

Keyword(s):

Lead Zirconate Titanate ◽

Lead Zirconate ◽

Relaxor Ferroelectric ◽

Electrocaloric Effect ◽

Zirconate Titanate ◽

Titanate Ceramics

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Effect of Carbon Addition on Dielectric Properties of 0-3 PZT-Portland Cement Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.55-57.377 ◽

2008 ◽

Vol 55-57 ◽

pp. 377-380 ◽

Cited By ~ 12

Author(s):

Nittaya Jaitanong ◽

K. Wongjinda ◽

P. Tammakun ◽

Gobwute Rujijanagul ◽

Arnon Chaipanich

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Portland Cement ◽

Lead Zirconate Titanate ◽

Room Temperature ◽

Cement Composite ◽

Lead Zirconate ◽

Carbon Powder ◽

Carbon Addition ◽

Zirconate Titanate

The dielectric properties of the 0-3 lead zirconate titanate (PZT)-portland cement (PC) composite with carbon addition were investigated. Lead zirconate titanate (PZT), Portland cement (PC) composite and carbon powder were fabricated using 50% of PZT, and varying addition of carbon 1, 2 % by volume. The dielectric properties were measured under room temperature at different frequency from 1kHz-20kHz. Carbon addition was found to slightly increase the dielectric constant of PZT-PC composite at room temperature. The results also show that both the carbon powder addition and frequency affected the dielectric constant and dielectric loss tangent of 0-3 all PZT-PC composites.

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