Duo Zhang, Ruijin Sun, Zhaolong Liu, Haodong Li, Munan Hao, Yuxin Ma, Ke Ma, Dezhong Meng, Zhiyuan Zheng, Yibo Xu, Xu Chen, Qiu Fang, Xuefeng Wang, Linjie Dai, Changchun Zhao and Shifeng Jin
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引用次数: 0
Abstract
Among existing pyroelectric materials, inorganic polar oxides exhibit large pyroelectric coefficients. However, their pyroelectric performance is severely limited by the high dielectric constants due to the inverse relationship between pyroelectric figures of merit (FOMs) and dielectric constants. On the other hand, organic pyroelectric materials, while having lower dielectric constants and losses, suffer from poor stability, which greatly restricts their application. Regarding the above issues, we present a novel class of polar oxides, Ba6Pb3.2(PO4)6Cl2 (BPPC) and Ba6(Bi0.5Na0.5)4(PO4)6Cl2 (BBNPC), derived from a previously unreported transformation of non-polar apatite structures. These materials exhibit exceptionally low dielectric constants (∼10) and losses (∼0.002), (room-temperature, 10 kHz frequency) combined with high stability. Notably, BPPC demonstrates outstanding pyroelectric performance, with a pyroelectric coefficient of 110 μC m−2 K−1. The pyroelectric figures of merit (FOMs) for BPPC (room-temperature, 10 kHz frequency, Fv = 0.7 m2 C−1, FD = 17.0 × 10−5 Pa1/2, FE = 5.12 × 10−11 m3 J−1) surpass those of most existing inorganic pyroelectrics and approach the performance of leading organic materials. This pioneering doping strategy, leveraging size differentiated atomic substitution to induce spontaneous polarization, opens new avenues for designing high-performance polar oxides with potential applications in ferroelectric, piezoelectric, and photonic technologies. Our findings significantly expand the scope of polar functional materials beyond traditional perovskite-type oxides.
期刊介绍:
The Journal of Materials Chemistry A, B & C covers a wide range of high-quality studies in the field of materials chemistry, with each section focusing on specific applications of the materials studied. Journal of Materials Chemistry A emphasizes applications in energy and sustainability, including topics such as artificial photosynthesis, batteries, and fuel cells. Journal of Materials Chemistry B focuses on applications in biology and medicine, while Journal of Materials Chemistry C covers applications in optical, magnetic, and electronic devices. Example topic areas within the scope of Journal of Materials Chemistry A include catalysis, green/sustainable materials, sensors, and water treatment, among others.