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- 저자 : P.K. Barhai (검색결과 2 건)
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Nickel doped PZT ceramics by a spray dried-PVA assisted method
S.K. Sinha,Amit Kumar Sinha,P. Kour,P.K. Barhai 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Ferroelectric thin material of PZT modified with Ni 2+, with a Zr/Ti molar ratio 54/46 was prepared by spray drying the nitrate solution of lead, zirconium ,titanium and nickel in a stoichiometric ratio followed by stirring at 80 oC for 36 hours in 3% v/v PVA. The gel prepared by the PVA method was then calcined at 550 oC. Tetragonal perovskite type phases were identified as being present in the calcined powder. The remanent polarization (Pr) and the coercive field (Ec) were found to be 5.1 μCcm−2 and 46.2 KV/cm, respectively. The d33 value in PZT was found to be 192 × 10−12 C/N at 33 KV/cm at 1.5 atomic percent dopant concentration. SEM micrographs showed the grain size in the range of 0.5 μm. In conclusion, Ni 2+ incorporation in a PZT material contributes to the polarizibility and the spray dried PVA method slightly lowers the Pr and increases the Ec when compared to the sol.gel technique or magnetron sputtering technique.
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S.K. Rout,S. Parida,E. Sinha,P.K. Barhai,I.W. Kim 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Polycrystalline CaBi4Ti4O15 ceramic has been prepared through a modified chemical reaction technique. Room temperature X-ray diffraction (XRD) analysis shows the formation of a single phase orthorhombic perovskite structure. Simultaneous analysis of the complex impedance (Z*), and electric modulus (M*)spectroscopy was carried in the temperature range of 100–850 ℃. The dielectric relaxation is found to be of non-Debye type. The Nyquist plot shows the negative temperature coefficient of resistance type behavior. Two different conduction mechanisms are may be due to: (a) the dielectric relaxation processes due to localized conduction associated with oxygen vacancy; and (b) the non-localized conduction corresponding to long range conductivity associated with extrinsic mechanisms fundamentally associated due to the chemical inhomogeneity caused due to the difference in the ionic environment of Ca2+ and Bi3+ and their sharing in the A site of perovskite and [Bi2O2]2+ slabs. Different conductivity components are recognized inside the grain: long range dc conductivity at low frequency region, a capacitive behavior at higher frequencies, and a universal power law behavior in an intermediate-frequency region where grain boundary contributions are neglected.
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