Investigation of the crystal structure, lattice vibration and dielectric property of SrZrO 3 ceramic
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Ze-Ming Qi National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, People’s Republic of China (Received 21 January 2016; accepted 31 August 2016)
SrZrO3 ceramic with perovskite-type structure was synthesized by a conventional solid-state reaction method at 1500 °C for 3 h. The crystal structures were studied by x-ray diffraction (XRD), and lattice vibrational modes were obtained by Raman and Fourier transform far-infrared (FTIR) reflection spectroscopy. The dielectric properties of the samples were also measured. According to XRD data, the SrZrO3 ceramic displayed the orthorhombic structure Pbnm (62). The Raman spectrum with ten active vibrators can be fitted by the Lorentzian function, and the vibrators were assigned. Far-infrared spectrum with six infrared active modes was fitted by the four-parameter semiquantum models. Consequently, the modes were assigned as F1u(1) (102 cm1), F2u(2) (120 cm1), F1u(3) (140 cm1), F3u(4)9 (228 cm1), F3u(4)0 (287 cm1), F1u(5) (326 cm1), and F1u(6) (527 cm1). The infrared mode F1u(1), that can be represented as the Sr–ZrO6 inverted translational vibration, has the highest contribution to the dielectric properties (permittivity and dielectric loss). The calculated data agree well with the measured values. I. INTRODUCTION
ABO3-type microwave dielectric ceramics are materials widely used as components in resonators and filters because of their following characteristics: suitable permittivities (er), near-zero temperature coefficients at resonant frequencies (sf), and high quality factors (Qf). Among ABO3 perovskites, SrZrO3 shows a great potential for a large variety of technological applications in the field of optical waveguides, highly intense violet-blue light emission, laser-host crystals, high-temperature oxygen sensors, and capacitors.1 X-ray diffraction (XRD), Raman and Fourier transform far-infrared (FTIR) reflection spectroscopy are the common measurements for the characterization of solid materials. XRD is used to investigate the crystal structures of ceramics, while, Raman and FTIR reflection spectroscopy are often used to investigate the vibrational modes of ceramics. In addition, the four-parameter semiquantum models can be used to analyze the IR vibrational modes. It may provide new insights to improve the properties or to design new material by studying the lattice vibrational characteristics of materials.2,3
Contributing Editor: Edward M. Sabolsky a) Address all correspondence to this author. e-mail: sf [email protected] DOI: 10.1557/jmr.2016.340
H. Fujimori et al.4,5 studied the phase change of SrZrO3 from 700 °C to 1200 °C. A. Slodczyk et al.6 conducted a high-pressure Raman study of Yb-doped SrZrO3. Parida et al.7 analyzed the system Sr(ZrxTi1x)O3 by x-ray diffraction, FT-Raman and FTIR spectroscopy. Amisi et al.8 reported a first-principles study of the structural, electronic, dielectric, and dynamical properties of the different phases of SrZrO3. Kamishima et al.9 assigned the Raman bands of SrZrO3 single crystal,
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