TAILIEUCHUNG - Ba1−xCaxTiO3 and the dielectric properties

The frequency dependence of the impedance (C) and AC conductance (G) of all the samples were recorded in a frequency range lower than 10 MHz by using an impedance analyzer HP 4192A. It was found that in the low frequency range lower than 1 MHz the dielectric constant and its loss decrease as Ca substituted for Ba. Besides an abnormal in the frequency dependence of the dielectric constant was observed for all samples in the higher frequency range up to 10 MHz. | Communications in Physics, Vol. 24, No. 2 (2014), pp. 170-176 Ba1−x Cax TiO3 AND THE DIELECTRIC PROPERTIES NGUYEN VAN KHIEN Thai Nguyen University, Thai Nguyen City VU DINH LAM AND LE VAN HONG Material Science Institute, Academic Science and Technology Vietnam E-mail: honglv@ Received 04 April 2014 Accepted for publication 24 May 2014 Abstract. Ba1−x Cax TiO3 material samples with x changing from zero to 1 were fabricated by the solid state reaction method at a temperature of 1200 ˚C in the ambient atmosphere. Crystalline structure of the material samples was recorded and identified by X-ray diffraction and Raman scattering. Analyzing the X-ray patterns found that Ba can be completely substituted by Ca with the concentration lower than 11 at%. The frequency dependence of the impedance (C) and AC conductance (G) of all the samples were recorded in a frequency range lower than 10 MHz by using an impedance analyzer HP 4192A. It was found that in the low frequency range lower than 1 MHz the dielectric constant and its loss decrease as Ca substituted for Ba. Besides an abnormal in the frequency dependence of the dielectric constant was observed for all samples in the higher frequency range up to 10 MHz. Keywords: lead-free pezoelectric, X-ray diffraction, dielectric resonance. I. INTRODUCTION The ferroelectric material perovskite BaTiO3 have attracted much attentions of the worldwide scientists and technologies [6, 8, 9] because it is one of the lead-free pezoelectric materials that has huge applications in the electronic industry, such as: ultrasonic sensors, ultrasound machines, vibrating membrane, generators, Xiaobin Ren [1] reported a new experimental result dealing with a new compound BaZr1−z Tiz O3-xBa1−y Cay TiO3 (BZT-xBCT) that its piezoelectric parameter d33 is significantly improved, reached to 620 pC/N with x of 50 at%, higher than the maximal values 580 pC/N of the PZT-5H that was reported until now. After the report of

• Vật lý
• Communications in Physics
• Ba1−xCaxTiO3 and the dielectric properties
• The dielectric properties
• X ray diffraction and Raman scattering
• The frequency dependence of the impedance
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