Structural and transport properties of NdCrO{sub 3} nanoceramics
06 Feb 2013-Journal of Physics C: Solid State Physics (American Institute of Physics)-Vol. 1512, Iss: 1, pp 930-931
TL;DR: In this article, the room temperature powder X-ray diffraction profile of NdCrO3 (NCO3) nanoceramics synthesized by sol-gel processing shows orthorhombic Pnma space group symmetry.
Abstract: Reitveld refinement of the room temperature powder X-ray diffraction profile of NdCrO3 (NCO) nanoceramics synthesized by sol-gel processing shows orthorhombic Pnma (D2h16) space group symmetry. The refined lattice parameters are a = 5.482(3) A, b = 7.689(4) A and c = 5.416(3) A. Transmission electron microscopy (TEM) of NCO shows that the average particle size is around 70 nm. The electrical transport property of NCO is investigated by both conductivity and electric modulus formalism. The electrical data is taken by a LCR meter in a temperature range from 303 K to 573 K and in a frequency range from 42 Hz to 1.1 MHz. The ac conductivity follows a power law. The Cole-Cole plot of impedance at 303 K shows grain effect.
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01 Jan 1983TL;DR: In this paper, a broad-brush view of dielectric relaxation in solids is presented, making use of the existence of a universality of Dielectric response regardless of a wide diversity of materials and structures with dipolar as well as charge-carrier polarization.
Abstract: This review presents a wide-ranging broad-brush picture of dielectric relaxation in solids, making use of the existence of a `universality' of dielectric response regardless of a wide diversity of materials and structures, with dipolar as well as charge-carrier polarization. The review of the experimental evidence includes extreme examples of highly conducting materials showing strongly dispersive behaviour, low-loss materials with a `flat', frequency-independent susceptibility, dipolar loss peaks etc. The surprising conclusion is that despite the evident complexity of the relaxation processes certain very simple relations prevail and this leads to a better insight into the nature of these processes.
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