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Browsing by Author "Deepa, M"

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Electrical conductivity and impedance spectroscopy studies of cerium based aeschynite type semiconducting oxides: CeTiMO6 (M = Nb or Ta)

Sumi, S; Prabhakar Rao, P; Deepa, M; Peter Koshy (American Institute of Physics, 2010)

Complex ceramic oxides, CeTiMO6 (M=Nb or Ta) having aeschynite type mineral structure were prepared by the conventional ceramic route. Complex impedance analysis in the frequency range 10 Hz-1 MHz over a wide temperature ...
Influence of disorder-to-order transition on lattice thermal expansion and oxide ion conductivity in (CaxGd1-x) 2 (Zr1-xMx)2 O-7 pyrochlore solid solutions

Radhakrishnan, A N; Prabhakar Rao, P; Mary Linsa, K S; Deepa, M; Peter Koshy (Elsevier, 2011)

The effect of simultaneous substitutions of Ca at A site and Nb or Ta at B site in pyrochlore-type solid solutions: (CaxGd1-x)(2)(Zr1-xMx)(2) O-7 (x = 0.1, 0.2, 0.3, 0.4, 0.5 and M = Nb or Ta) were studied by powder X-ray ...
New negative temperature coefficient ceramics in Ca-Ce-Nb-M-O (M=Mo or W) system

Deepa, M; Prabhakar Rao, P; Sumi, S; Radhakrishnan, A N P; Peter Koshy (Wiley, 2010)

A series of quaternary powellites with varying cerium contents in a Ca-Ce-Nb-M-O (where M=Mo or W) system has been synthesized through the solid-state route. Powder X-ray diffraction analysis shows that these compounds ...
Novel Powellite-based Red-emitting Phosphors: CaLa1−xNbMoO8:xEu3+ for White Light Emitting Diodes

Mariyam Thomas; Prabhakar Rao, P; Deepa, M; Chandran, M R; Peter Koshy (Elsevier, 2009-01)

We report the photoluminescence properties of a novel powellite-based red-emitting phosphor material: CaLa1−xNbMoO8:xEu3+ (0.01, 0.03, 0.05, 0.1) for the first time. The photoluminescence investigations indicated that ...
Order–disorder Phase Transformations in Quaternary Pyrochlore Oxide System: Investigated by X-ray Diffraction, Transmission Electron Microscopy and Raman Spectroscopic Techniques

Radhakrishnan, A N; Prabhakar Rao, P; Sibi, K S; Deepa, M; Peter Koshy (Elsevier, 2009-08)

Order–disorder transformations in a quaternary pyrochlore oxide system, Ca–Y–Zr–Ta–O, were studied by powder X-ray diffraction (XRD) method, transmission electron microscope (TEM) and FT-NIR Raman spectroscopic techniques. ...
Oxide ion conductivity and relaxation in CaREZrNbO7 (RE=La,Nd, Sm,Gd, and Y) system

Sibi, K S; Radhakrishnan, A N; Deepa, M; Prabhakar Rao, P; Peter Koshy (Elsevier, 2009)

CaREZrNbO7 (RE=La, Nd, Sm, Gd and Y) system changed from fluorite (F)-type to pyrochlore (P)-type structure when the ionic radius ratios, r(Ca2+–RE3+)av/r(Zr4+–Nb5+)av were larger than 1.34. Thus, the La, Nd, and Sm ...
Pyrochlore Type Semiconducting Ceramic Oxides in Ca–Ce–Ti–M–O System (M = Nb or Ta)—Structure, Microstructure and Electrical Properties

Deepa, M; Prabhakar Rao, P; Radhakrishnan, A N; Sibi, K S; Peter Koshy (Elsevier, 2009-07-01)

A new series of pyrochlore type ceramic semiconducting oxides in Ca–Ce–Ti–M–O (M = Nb or Ta) system has been synthesized by the conventional ceramic route. The electrical conductivity measurements show that these oxides ...
Structural and electrical properties of nonstoichiometric semiconducting pyrochlores in Ca-Ce-Ti-Nb-O system

Deepa, M; Prabhakar Rao, P; Sumi, S; Radhakrishnan, A N; Chandran, M R; Peter Koshy (Elsevier, 2011)

A series of quaternary nonstoichiometric cubic pyrochlores with varying cerium content in Ca-Ce-Ti-Nb-O system has been synthesized through solid state route. The powder X-ray diffraction and Rietveld analysis indicate ...
Studies on structural, microstructural and electrical properties of cerium based high temperature semiconducting complex oxides

Deepa, M (Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology(CSIR), Thiruvananthapuram., 2010)
Studies on the effect of processing parameters on electroless coating of copper on boron carbide particles

Deepa, M; Resmi, V G; Rajan, T P D; Pavithran, C; Pai, B C (Springer, 2011)

Boron carbide a hard refractory semiconductor ceramic material due to its unique structural properties and high neutron cross section finds application as structural materials and neutron shielding material. Its applicability ...

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