Effect of Constituent Core-sizes on Microstructure and Dielectric Properties of BaTiO3@(0.6Ba-TiO3-0.4BiAlO3) Core-Shell Material |
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Authors: | Millicent Appiah Hua Hao Wenjin Chen Cheng Chen Zhonghua Yao Minghe Cao Hanxing Liu |
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Affiliation: | 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering,Wuhan University of Technology,Wuhan,China;2.International School of Materials Science and Engineering,Wuhan University of Technology,Wuhan,China |
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Abstract: | The fundamental characteristics of varied initial core-sizes of BaTiO3(BT) and its influential role on the morphology and dielectric properties of BaTiO3@0.6BaTiO3-0.4BiAlO3(BT@0.6BT-0.4BA) ceramic samples were studied. Alkoxide sol-precipitation method was adopted as revised chemical route to synthesize the constituent “core” BT powders in a dispersed phase, whereas the distinctive initial nano-sized particles were affected by the pre-calcination temperatures (600-900 °C).The microstructure of the uncoated BT ceramics revealed an exaggerated grain growth with an optimized dielectric constant (εmax >9 000) whilst the coated ceramics behaved otherwise (grain growth inhibited) when sintered at an elevated temperature. Regardless of the previously studied solubility limit (about 0.1%) of BT-BA samples, BT@0.6BT-0.4BA maintained a maximum dielectric constant (εmax) ranging from 1 592 to 1 708 and tan δ less than 2% under a unit mole ratio at room temperature. In view of all these analyses, the initial nanometer sizes of the as-prepared BT-core powders combined with the increase effect of cation substitutions of Bi3+ and Al3+ in the shell content, induced the diffuse transition phase of BT@0.6BT-0.4BA composition. |
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