Enhanced dielectric and tunable properties of barium strontium titanate thin films through introducing Nd(Zn1/2Ti1/2)O3 and adjusting Ba/Sr
Enhanced dielectric and tunable properties of barium strontium titanate thin films through introducing Nd(Zn1/2Ti1/2)O3 and adjusting Ba/Sr
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DOI：
10.1007/s10853-013-7783-x
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发表时间：
2014-02-01
影响因子：
4.5
通讯作者：
Huang, Caihua
中科院分区：
文献类型：
--
作者：
Sun, Xiaohua;Yang, Ying;Huang, Caihua
采用溶胶-凝胶法在Pt/Ti/SiO2/Si衬底上制备了Ba0.6Sr0.4TiO3 （BST）和0.06Nd(Zn1/2Ti1/2)O-3-0.94Ba (x) Sr1-x TiO3 （NZT-BST）薄膜，薄膜x = 0.6、0.7、0.75和0.8。研究了BST和NZT-BST薄膜的结构、表面形貌、介电性能、铁电性能和热稳定性与NZT和Ba含量的关系。结果发现，在BST中引入NZT可以显著降低介电损耗，同时也降低了可调性。在此基础上，增加NZT-BST薄膜中的Ba/Sr，导致薄膜的介电常数和可调性同时增加。结果表明，0.06Nd(Zn1/2Ti1/2)O-3-0.94Ba(0.7)Sr(0.3)TiO(3)薄膜具有最佳的介电性能和可调性能，FOM值最高为43.22。这唤醒了我们，为了降低介电损耗，在弱铁电性钙钛矿可调材料中，而不是在准电性钙钛矿可调材料中，引入一定量的低介电常数氧化物或NZT等非铁电性材料，可能会获得更优异的介电和可调性能。
Ba0.6Sr0.4TiO3 (BST) and 0.06Nd(Zn1/2Ti1/2)O-3-0.94Ba (x) Sr1-x TiO3 (NZT-BST) thin films with x = 0.6, 0.7, 0.75, and 0.8 were fabricated on Pt/Ti/SiO2/Si substrates by sol-gel method. The structures, surface morphology, dielectric, and ferroelectric properties, and thermal stability of BST and NZT-BST thin films were investigated as a function of NZT and Ba content. It was found that introducing NZT into BST decreased significantly dielectric loss, however, along with the tunability. On this basis, increasing Ba/Sr in NZT-BST thin films led to the simultaneous increase of dielectric constant and tunability of thin films. As a result, optimized dielectric and tunable properties were obtained for 0.06Nd(Zn1/2Ti1/2)O-3-0.94Ba(0.7)Sr(0.3)TiO(3) thin film with the highest FOM value of 43.22. It awakens us that, for reducing dielectric loss, introducing a certain amount of low permittivity oxides or non-ferroelectrics like NZT into weak ferroelectric perovskite tunable materials, not into paraelectric perovskite tunable materials, may obtain more excellent dielectric and tunable performances.