Energy-storage properties and high-temperature dielectric relaxation behaviors of relaxor ferroelectric Pb(Mg1/3Nb2/3)O3–PbTiO3ceramics

et al. 2016

Sci Rep

The behavior of ferroelectric domain under applied electric field is very sensitive to point defects, which can lead to high temperature dielectric relaxation behaviors. In this work, the phases, dielectric properties and ferroelectric switching behavior of strontium lead titanate ceramics were investigated. The structural characterization is confirmed by X-ray diffraction. The high dielectric tunability and high figure of merit of ceramics, especially Sr0.7Pb0.3TiO3 (SPT), imply that SPT ceramics are promising materials for tunable capacitor applications. Oxygen vacancies induced dielectric relaxation phenomenon is observed. Pinched shape hysteresis loops appeared in low temperature, low electric field or high frequency, whereas these pinched hysteresis loops also can become normal by rising temperature, enhancing electric field or lowering frequency. The pinning and depinning effect can be ascribed to the interaction between oxygen vacancies and domain switching. A qualitative model and a quantitative model are used to explain this phenomenon. Besides, polarization and oxygen treated experiment can exert an enormous influence on pinning effect and the machanisms are also discussed in this work.

Section: Resultssupporting

confidence: 63%

Dielectric relaxation and pinning phenomenon of (Sr,Pb)TiO3 ceramics for dielectric tunable device application

Huang

Zhang

et al. 2016

Sci Rep

“…With the increasing temperature, a single semicircular arc had been observed and the radius of semicircles decreased, which illustrated a strong temperature dependence resistance. The mobility of the space charge became easier with the increasing temperature, the accumulated charge carriers in the vicinity of phase boundaries had sufficient energy to pass through the barrier, leading to an enhanced conductivity with the reduction in impedance [18]. The Nyquist plot showed a tail at lower frequencies, indicating the contact effect come into action, the similar phenomenon is also observed in SmAlO 3 ceramics [38].…”

Section: Resultsmentioning

confidence: 97%

“…Based on previous studies, there had been many reports about the energy-storage properties of ceramics, such as Bi-based lead-free piezo-ceramics, Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 , (Bi 0.5 Na 0.5 )TiO 3 -Ba 0.85 Ca 0.15 Ti 0.9 Zr 0.1 O 3 , Ba 0.95 Ca 0.05 Zr 0.3 Ti 0.7 O 3 , etc. [17,18,19,20]. However, the recoverable energy-storage density of previous works is lower than the AFE materials for energy storage ceramic capacitors application.…”

Section: Introductionmentioning

confidence: 99%

High Energy Storage Density and Impedance Response of PLZT2/95/5 Antiferroelectric Ceramics

Liu

et al. 2017

Materials

(Pb 0.97 La 0.02 )(Zr 0.95 Ti 0.05 )O 3 (PLZT2/95/5) ceramics were successfully prepared via a solid-state reaction route. The dielectric properties were investigated in the temperature region of 26-650 • C. The dielectric diffuse anomaly in the dielectric relaxation was found in the high temperature region of 600-650 • C with increasing the measuring frequency, which was related to the dynamic thermal process of ionized oxygen vacancies generated in the high temperature. Two phase transition points were detected during heating, which were found to coexist from

“…Compared with bulk materials, our results of J reco are higher than BaTiO 3 -SrTiO 3 composites 57 , BaSrTiO 3 ceramics 58 , Sr 0.5 Ba 0.5 Nb 2 O 6 glass-ceramics 59 , and etc . From aspects of applications, the priority among priorities for energy-storage devices are to gain a slim hysteresis loop (large saturated polarization, weak coercive field and small remanent polarization) or double hysteresis loops, this is the research direction to which we should pay more attentions 47,52 .…”

Section: Resultsmentioning

confidence: 99%

Enhanced electrocaloric analysis and energy-storage performance of lanthanum modified lead titanate ceramics for potential solid-state refrigeration applications

Zhang

Huang

et al. 2018

Sci Rep

The unique properties and great variety of relaxer ferroelectrics make them highly attractive in energy-storage and solid-state refrigeration technologies. In this work, lanthanum modified lead titanate ceramics are prepared and studied. The giant electrocaloric effect in lanthanum modified lead titanate ceramics is revealed for the first time. Large refrigeration efficiency (27.4) and high adiabatic temperature change (1.67 K) are achieved by indirect analysis. Direct measurements of electrocaloric effect show that reversible adiabatic temperature change is also about 1.67 K, which exceeds many electrocaloric effect values in current direct measured electrocaloric studies. Both theoretical calculated and direct measured electrocaloric effects are in good agreements in high temperatures. Temperature and electric field related energy storage properties are also analyzed, maximum energy-storage density and energy-storage efficiency are about 0.31 J/cm3 and 91.2%, respectively.