Abstract
0.7BaO·0.3SrO·0.5Nb 2 O 5 ·0.5TiO 2 (SBN/BST) composite ceramics were, for the first time, fabricated using a Powder-Sol (P-S) method with Nb 2 O 5 fine powder suspended in the barium strontium titanate (abbreviated as BST) sol solution. X-ray diffraction (XRD) investigations revealed that the tetragonal tungsten bronze (TTB) phase and perovskite phase were co-present in compositions. Scan electron microscope (SEM) investigations showed that the composite ceramic is homogeneous and fine-grained. The average grain size of BST and SBN phase is 200 nm and 3.0 µm, respectively. The room temperature relative dielectric constant is 2320 for this sample measured at 1 kHz and zero bias. The pyroelectric coefficient of the 0.7BaO·0.3SrO·0.5Nb 2 O 5 ·0.5TiO 2 is found be 70 nc/cm2·°C in the room temperature.
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