Abstract
The polycrystalline sample of complex tungsten-bronze compound Li2Pb2Sm2W2Ti4Ta4O30 was prepared by a high-temperature solid-state reaction technique. Room temperature X-ray diffraction (XRD) study suggests the formation of a single-phase compound. Microstructure of the pellet sample was studied by scanning electron microscope. The temperature variation of dielectric constant shows dielectric anomaly in the sample. Study of electrical properties (impedance, conductivity, etc.,) of the material exhibits a strong correlation between its micro-structure (i.e., bulk, grain boundary, etc) and electrical parameters. A typical Arrhenius behavior was observed in the temperature dependence of dc conductivity.
Highlights
Among all the ferroelectric oxides known today, tungsten bronze (TB) structural families are found to be important for pyroelectric and ferroelectric devices above room temperature
X-ray diffraction (XRD) pattern on calcined powder was recorded at room temperature using X-ray powder diffractometer (Rigaku)
Structural study The X-ray diffraction (XRD) pattern of Li2Pb2Sm2W2Ti4Ta4O30, recorded at room temperature on its powder sample, is shown in Fig. 1 The XRD pattern consists of large number sharp and single peaks, which are different from those of the ingredients confirms the formation of new compound [16] in a single phase
Summary
Structural study The X-ray diffraction (XRD) pattern of Li2Pb2Sm2W2Ti4Ta4O30, recorded at room temperature on its powder sample, is shown in Fig. 1 The XRD pattern consists of large number sharp and single peaks, which are different from those of the ingredients confirms the formation of new compound [16] in a single phase. The value of εmax and tanδmaxof the titled compound decreases with rise in frequency. Such characteristic is normally found in a normal ferroelectric material. The transition temperature, room temperature dielectric constant and tangent loss of the material are found to be 35oC, 225 and 0.051 respectively. The values of tanδmax (tangent loss at Tc) at same frequency are found to be 2.03, 0.18 and 0.04
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