Electric field-temperature phase diagram of Bi1/2(Na0.8K0.2)1/2TiO3 relaxor ferroelectrics with Fe doping

Zhang, Huazhang; Zhou, Jing; Shen, Jie; Yang, Xiong; Wang, Tianheng; Xiang, Guanglei; Quan, Wei; Chen, Wen

doi:10.1063/1.5097127

Cited by 7 publications

(1 citation statement)

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“…As mentioned above, the J-E curve is an important tool to identify FE/AFE properties. The J peak reflects the domain switching or phase transition process, and the corresponding electric field is the critical electric field [41,42]. Based on the J-E curves at different temperatures, Fig.…”

Section: Resultsmentioning

confidence: 99%

Correlation between multi-factor phase diagrams and complex electrocaloric behaviors in PNZST antiferroelectric ceramic system

Li¹,

Yin²,

Li³

et al. 2023

Journal of Advanced Ceramics

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Ferroelectric (FE) phase transition with a large polarization change benefits to generate large electrocaloric (EC) effect for solid-sate and zero-carbon cooling application. However, most EC studies only focus on the single-physical factor associated phase transition. Herein, we initiated a comprehensive discussion on phase transition in Pb 0.99 Nb 0.02 [(Zr 0.6 Sn 0.4 ) 1−x Ti x ] 0.98 O 3 (PNZST100x) antiferroelectric (AFE) ceramic system under the joint action of multi-physical factors, including composition, temperature, and electric field. Due to low energy barrier and enhanced zero-field entropy, the multi-phase coexistence point (x = 0.12) in the composition-temperature phase diagram yields a large positive EC peak of maximum temperature change (ΔT max ) = 2.44 K (at 40 kV/cm). Moreover, the electric field-temperature phase diagrams for four representative ceramics provide a more explicit guidance for EC evolution behavior. Besides the positive EC peaks near various phase transition temperatures, giant positive EC effects are also brought out by the electric field-induced phase transition from tetragonal AFE (AFE T ) to low-temperature rhombohedral FE (FE R ), which is reflected by a positive-slope boundary in the electric field-temperature phase diagram, while significant negative EC responses are generated by the phase transition from AFE T to high-temperature multi-cell cubic paraelectric (PE MCC ) with a negative-slope phase boundary. This work emphasizes the importance of phase diagram covering multi-physical factors for high-performance EC material design.

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Section: Resultsmentioning

confidence: 99%

Correlation between multi-factor phase diagrams and complex electrocaloric behaviors in PNZST antiferroelectric ceramic system

Li¹,

Yin²,

Li³

et al. 2023

Journal of Advanced Ceramics

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Realization of the Giant Pyroelectric Response via Modulated Polar Structures

Wen,

Wu,

Yin

et al. 2024

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Among pyroelectric materials, Bi0.5Na0.5TiO3 (BNT)‐based relaxors are particularly noteworthy due to their significant polarization fluctuation near the depolarization temperature (Td), resulting in a large pyroelectric response. What has been overlooked is the dynamic behavior of inherent polar structures, particularly the temperature‐dependent evolution of polar nanoregions (PNRs), which significantly impacts the pyroelectric behavior. Herein, based on the large pyroelectric response origination (the ferroelectric‐relaxor phase transition), the mixed nonergodic and ergodic relaxor (NR+ER) critical state is constructed, which is believed to trigger the easily fluctuating polarization state with excellent pyroelectric response. Composition engineering (with Li+, Sr2+, and Ta5+) strategically controls the relaxor process and modulates the dynamic behavior of inherent polar structures by the random field effect. The pyroelectric coefficient of more than 1441 µCm−2K−1 at room temperature (RT), more than 9221 µCm−2K−1 (RT), and ≈107911 µCm−2K−1 (Td) are achieved in the Li+‐doped sample, the Sr2+‐doped sample, and the (Li++Ta5+) co‐doped sample, respectively. This work earns the highest RT pyroelectric coefficient in BNT‐based relaxors, which is suitable for pyroelectric applications. Furthermore, it provides a strategy for modulating the pyroelectric performance of BNT‐based relaxors.

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