Field Sensitive Ba_1-xSr_xTi_0.89Hf_0.11O₃ Ceramics with Super High Dielectric Tunability

Barium strontium titanate(Ba_1-xSr_xTiO₃, BST) is a promising candidate for tunable components but the turnability of BST is relatively low and the mechanisms of turnability and the impact of electric fields on the dielectric properties of BST ceramics require more comprehensive research. Here, by introducing Hf and adjusting the content of Sr, the transition in BST ceramics turn to the diffuse phase There are at least two distinct polar structures, which is suggested by different current peaks in current-electric field loops. The developed ceramics show super high dielectric tunability (up to 68%) which can be attributed the different polar structures having significantly sensitive to applied electric fields. Compared to pure BST ceramics or other doped variants, the designed BST exhibit nearly twice the increase in dielectric tunability and hold great potential for widespread use in tunable devices including phase shifters, resonators, filters, voltage-controlled oscillator.