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With the rapid development of space exploration and new energy vehicles, it is urgent to build ultrawide temperature multilayer ceramic capacitors (UWT MLCCs) to match electronic circuits that can withstand harsh environmental conditions. Relaxor ferroelectrics with diffuse phase transition feature are potential dielectrics for the construction of UWT MLCCs. However, how to ensure high dielectric constant together with low dielectric loss in the wide temperature region is still a big challenge. Here, the above dif ficulties are addressed by tailoring the combination types of polar nanoregions (PNRs) in the (1x ) (0.8Na 0.5 Bi 0.5 TiO 3 -0.2K 0.5 Bi 0.5 TiO 3 )- x NaTaO 3 (NBT-KBT- x NT) system. Compared with PNRs types of P 4 bm + R 3 c and P 4 bm + Pbnm , the combination type of P 4 bm + Pbnm + R 3 c PNRs in NBT-KBT-0.31NT is the most bene ficial to obtain comprehensive excellent dielectric performance because it can balance the relationship between high dielectric constant and temperature stability over a wide temperature region. Further, by optimizing the laminating pressure and co- firing temperature to realize a tight interfacial structure between the dielectric layer and the Pt inner electrode, a record-high dielectric constant ( epsilon r = (907% +/- 15%)) together with low dielectric loss (tan d <= 0.025) is achieved over an ultra-wide range from -61 degrees C to 306 degrees C for NBT-KBT-0.31NT MLCC, demonstrating that tailoring the combination types of PNRs is a powerful strategy in designing UWT MLCC dielectrics. (c) 2023 The Authors. Published by Elsevier B.V. on behalf of The Chinese Ceramic Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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JOURNAL OF MATERIOMICS
ISSN: 2352-8478
年份: 2024
期: 4
卷: 10
页码: 751-761
9 . 4 0 0
JCR@2022
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