Wang Bo, Zhao Le, Jia Xiuhuai, Yang Pan, Yu Shihui
Department of Electrical Engineering and Automation, Luoyang Institute of Science and Technology, Luoyang 471023, China.
School of Microelectronics, Tianjin University, Tianjin 300072, China.
Materials (Basel). 2023 Jul 25;16(15):5226. doi: 10.3390/ma16155226.
Ferroelectric varactors should have high tunability at low permittivity and a working electric field to obtain better impedance matching and stable tunability. In this work, (BaCa)(SnZrTi)O-2 mol% CuO-1 mol% LiCO (abbreviated as BCSZT100x, x = 0.05, 0.10, 0.15 and 0.20, respectively) are prepared to achieve high tunability at low permittivity and a working electric field. The tunable mechanisms are investigated based on crystal structure, micro-morphology and the permittivity-temperature spectrum. The results show that the shrink of oxygen octahedron and weaker interaction force between Sn and O make BCSZT5 ceramic have a higher tunability value of 26.55% at low permittivity (1913) and a working electric field (7.3 kV/cm). The tunability value of BCSZT5 ceramic increases by 58%, while its permittivity decreases by 25%, compared with x = 0. Those advantages make BCSZT5 ceramic have substantial application prospects in varactors.
铁电变容二极管应在低介电常数和工作电场下具有高可调性，以实现更好的阻抗匹配和稳定的可调性。在本工作中，制备了（BaCa）（SnZrTi）O - 2 mol% CuO - 1 mol% LiCO（分别缩写为BCSZT100x，x = 0.05、0.10、0.15和0.20），以在低介电常数和工作电场下实现高可调性。基于晶体结构、微观形貌和介电常数 - 温度谱对可调机制进行了研究。结果表明，氧八面体的收缩以及Sn与O之间较弱的相互作用力，使得BCSZT5陶瓷在低介电常数（1913）和工作电场（7.3 kV/cm）下具有26.55%的较高可调性值。与x = 0相比，BCSZT5陶瓷的可调性值提高了58%，而其介电常数降低了25%。这些优点使得BCSZT5陶瓷在变容二极管中具有广阔的应用前景。
