Composition dependence of structural and piezoelectric properties in Bi(Mg_0.5Ti_0.5)O₃-modified BaTiO₃-BiFeO₃ ceramics

Abstract

The chemical composition dependence of the Bi(Mg0.5Ti0.5)O3 (BMT)-modified BaTiO3 (BT)-BiFeO3 (BF) ceramics fabricated by a solid-state synthesis was studied. The effects of BT/BF ratios and BMT concentration on the crystal structure, piezoelectric and ferroelectric properties were investigated. The crystal structure carried out under the synchrotron radiation X-ray diffraction changed from the rhombohedral structure to the pseudo-cubic structure when the BT contents were increased. A significant change in crystal structure and piezoelectric characteristics was confirmed by varying the BT/BF ratios. In contrast, the crystal symmetry remained unaffected by varying the BMT concentration, while tailoring the piezoelectric and ferroelectric properties was revealed. Based on the analysis of the structural characteristics and overall electrical properties, the ceramics with modification of the BMT content along with BT/BF ratios could apply as candidate materials for various practical applications.

Fabrication of 〈100〉-oriented Bi(Mg0.5Ti0.5)O3-modified BiFeO3-BaTiO3 ceramics and their piezoelectric properties

“…Pb-free BiFeO 3 -BaTiO 3 (BFBT)-based piezoelectric ceramics are strong candidates for replacing Pb-based piezoelectric ceramics, owing to their relatively large piezoelectric response with a high Curie temperature. [1][2][3][4] Among them, we investigated the various ferroelectric and relaxor ferroelectric-like piezoelectric and ferroelectric properties in Bi(Mg 0.5 Ti 0.5 )O 3 (BMT)-modified BFBT systems through a chemical composition dependence. 2) Specifically, the composition range of (1−y) {xBT(1−x)BF}yBMT, where x = 0.25, 0.30, 0.33, and 0.40, and y = 0.01, 0.03, 0.05, and 0.10, was explored.…”

“…[1][2][3][4] Among them, we investigated the various ferroelectric and relaxor ferroelectric-like piezoelectric and ferroelectric properties in Bi(Mg 0.5 Ti 0.5 )O 3 (BMT)-modified BFBT systems through a chemical composition dependence. 2) Specifically, the composition range of (1−y) {xBT(1−x)BF}yBMT, where x = 0.25, 0.30, 0.33, and 0.40, and y = 0.01, 0.03, 0.05, and 0.10, was explored. Among the various investigated solid solution ceramics, the composition with x = 0.33 and y = 0.10 (referred to as 33BTBF-10BMT, hereafter), displayed relatively large piezoelectric and ferroelectric properties, despite exhibiting a pseudo-cubic symmetry as confirmed by high energy synchrotron X-ray diffraction.…”

Grain size-independent dielectric and ferroelectric properties of superparaelectric Mn–Nb co-doped barium titanate ceramics

“…The unique feature of spontaneous polarization in BT has attracted researchers from diverse fields such as ferroelectricity, piezoelectricity, photovoltaics, etc. [1][2][3][4][5][6] For instance, the spontaneous polarization leads to a higher dielectric constant in BT ceramics because of which BTbased ceramics are important dielectric components of multilayer ceramic capacitors (MLCCs). 7) With the advancement in technology, the dielectric materials used in MLCCs are rigorously investigated to fulfill the demands of future applications.…”

Effect of strontium substitution on growth and piezoelectric properties of calcium magnesium silicate Ca2MgSi2O7 single crystals

“…Polar piezoelectric materials generally have a high dielectric constant and high piezoelectric constant d ij ; hence, they have been used in medical transducer and actuator devices. [2][3][4][5][6] On the other hand, nonpolar piezoelectric materials show a low dielectric constant and low d ij , but have higher phase transition temperatures. Therefore, their possible applications include gas sensors, 7) microbalance, 8) and combustion pressure sensors, 9) which operate at temperatures higher than 300 °C.…”