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MnO2-doped barium strontium titanate–MgO (BST/MgO) composites were sintered by the solid-state reaction method. The effect of MnO2-doping on the microstructure and microwave dielectric properties of the BST/MgO composites was investigated. The MgO grains were found to be surrounded by Mn-rich oxides, which hindered the incorporation of Mg2+ into the lattice of BST. As a result, enhanced comprehensive...
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