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Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Synthesis and Characterization of Bismuth Tantalate Binary Materials for Potential Application in Multilayer Ceramic Capacitors (MLCC) | Journal of Physical Science Vol. 19 1 53-62 2008 53 Synthesis and Characterization of Bismuth Tantalate Binary Materials for Potential Application in Multilayer Ceramic Capacitors MLCC K.B. Tan F.G. Anna and Z. Zainal Chemistry Department Faculty of Science Universiti Putra Malaysia 43400 Serdang Malaysia Corresponding author tankb@science.upm.edu.my Abstract The single phase bismuth tantalate BiTaO4 was successfully synthesized by conventional solid-state method at sintering temperature 1100oC. This material crystallized in a triclinic system space group Pl with a 7.6585 Ấ b 5.5825 Ấ c 7.7795 Ấ a 90.03o f 77.04o and Y 86.48o respectively. The electrical properties of BiTaO4 were characterized by AC impedance analyzer HP4192 at temperature ranging from 25oC 850oC over frequency range of 5-13 MHz. The sample was highly resistive as the conductivities were unlikely to be determined below 55ƠC. On the other hand BiTaO4 exhibited moderate dielectric constant er 47 at ambient temperature in the frequency region of 1 MHz and near zero temperature coefficient of capacitance TCC 0.00022 making it a potential candidate for multilayer ceramic capacitors MLCC . Keywords solid-state method electroceramics dielectric constant AC impedance spectroscopy Abstrak Fasa tunggal bismut tantalat BiTaO4 telah disintesiskan secara kaedah keadaan pepejal pada suhu 1100PC. Bahan ini berkristal dalam sistem triklinik kumpulan ruang Pl dengan a 7.6585 Ấ b 5.5825 Ấ c 7.7795 Ấ a 90.03 f 77.04o dan Y 86.48o. Sifat elektrik telah dikaji dengan penggunaan impedans AC HP4192 dalam lingkungan suhu 25oC--85ƠC daripada frekuensi 5-13 MHz. Sampel ini mempunyai kerintangan yang tinggi dan kekonduksian adalah tidak mungkin ditentukan pada suhu bawah 550oC. Sementara itu BiTaO4 menunjukkan pemalar dielektrik er 47pada suhu sekitar dalam frekuensi 1 MHz dan juga pekali suhu bagi kapasitans TCC 0.00022 menyebabkan kesesuaian dijadikan sebagai kapasitor seramik berlapisan MLCC . Kata kunci kaedah keadaan .