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Tunability ofτ_f in perovskites and related compounds

机译:钙钛矿和相关化合物中τ_f的可调性

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摘要

Tuning the temperature coefficient of resonant frequency(τ_f)in microwave dielectrics has been attributed to two main mechanisms:(i)dilution of the average ionic polarizability;(ii)the onset of an octahedral tilt transition above room temperature. The contributions of each mechanism have been isolated using ceramics in the Sr_n+1Ti_nO_3n+1, (Sr_xCa_1-x)_3Ti_2O_7, and(Sr_xCa_1-x)TiO_3 series. In the Sr_n+1Ti_nO_3n+1 Series, relative permittivity(∈_r)andτ_f are linearly proportional over a broad range of Values, 100-37 and 800-140 ppm/deg. C, n = 4 and 1, respectively.
机译:调节微波介质中谐振频率的温度系数(τ_f)归因于两个主要机制:(i)稀释平均离子极化率;(ii)在室温以上出现八面体倾斜转变。已经使用Sr_n + 1Ti_nO_3n + 1,(Sr_xCa_1-x)_3Ti_2O_7和(Sr_xCa_1-x)TiO_3系列的陶瓷隔离了每种机制的作用。在Sr_n + 1Ti_nO_3n + 1系列中,相对介电常数(ε_r)和τ_f在100-37和800-140 ppm / deg的宽范围值内线性比例。 C,n = 4和1。

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