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Browsing by Author "Thomas, J K"

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Effect of Nb2O5 Substitution on the dielectric characteristics of DyTiTaO6 microwave ceramics

Joseph, J T; Kumar, H P; Manoj Raama Varma; Thomas, J K; Sam Solomon (Elsevier, 2008)

Ceramic materials of the type DyTiNbxTa1-xO6 Were prepared by conventional solid-state route for different values of x. The materials were characterized by X-ray diffraction and Scanning Electron Microscopy. Dysprosium ...
Influence of zinc oxide addition on LnTiTaO6 (Ln = Pr, Sm and Dy) materials for dielectric resonators

Padma Kumar, H; Joseph, J T; Thomas, J K; Manoj Raama Varma; Annamma, J; Sam Solomon (Elsevier, 2007)

LnTiTaO6 ceramics, doped with ZnO, were prepared in the solid-state ceramic route. The cylindrical samples were sintered at temperatures between 1360 and 1575 ◦C. The densities were measured using Archimedes method. Samples ...
Structural, spectroscopic and microwave characterizations of (Sm0.5Y0.5) Ti (Nb1-x Ta (x) )O-6 ceramics

James, T J; Shyla, J; Annamma, J; Thomas, J K; Prasad, V S; Sam Solomon (Springer, 2011)

Microwave dielectric ceramics of the type (Sm0.5Y0.5)Ti(Nb1-x Ta (x) )O-6 were prepared for x = 0, 0.2, 0.4, 0.6, 0.8 and 1 through the conventional solid state ceramic route. The ball-milled compositions were calcined at ...
Structure and properties of nanocrystalline BaHfO3 synthesized by an auto-igniting single step combustion technique

Thomas, J K; Padma Kumar, H; Prasad, V S; Sam Solomon (Elsevier, 2011)

High quality nanoparticles of barium hafnate have been synthesized using an auto-ignition modified combustion technique. The nanoparticles thus obtained have been characterized by powder X-ray diffraction, thermo gravimetric ...
Structure, microwave dielectric and optical properties of Ln(2/3)Gd(1/3)TiNbO(6) (Ln=Ce, Pr, Nd and Sm) ceramics

Annamma, J; Shyla Joseph; Manu, K M; Thomas, J K; Sam Solomon (Springer, 2011)

The Ln(2/3)Gd(1/3)TiNbO(6) ceramic compositions are prepared through the solid state ceramic route. The compositions are calcined at 1250 A degrees C and sintered in the range 1350-1435 A degrees C. Structural analysis of ...
Synthesis of Low Loss, Thermally Stable CexY1−xTiTaO6 Microwave Ceramics

Kumar, H P; Annamma, J; Vijayakumar, C; Thomas, J K; Varma, M R; Sam Solomon (2009-02-04)

CexY1−xTiTaO6 ceramics were prepared through the solid-state ceramic route. The materials were sintered in the range 1520–1580 °C. The structure of the system was analyzed by X-ray diffraction and Raman spectroscopic ...
Synthesis, crystal structure, dielectric properties, and potential use of nanocrystalline complex perovskite ceramic oxide Ba2ErZrO 5.5

Jose, R; Asha, M J; Thomas, J K; Jose James; Jacob Koshy; Divakar, R; Mohandas, E (Elsevier, 2007)

A new member belongs to Ba2REZrO5.5 (RE = Rare-Earth) perovskites, viz. Ba2ErZrO5.5, is synthesized as nanocrystals using a combustion process. Unlike the other Ba2REZrO5.5 perovskites, which are cubic, Ba2ErZrO5.5 ...
Synthesis, structuralanalysisanddielectricproperties of Ba8(Mg1 xZnx)Nb6O24 hexagonal perovskites

Sam Solomon; Suresh, M K; Thomas, J K; Prasad, V S; Wariar, P R S (Elsevier, 2012-12)

Ba8(Mg1 xZnx)Nb6O24 (x¼0, 0.2,0.4,0.6,0.8and1)ceramics were prepared through the conventional solid-stateroute.The materials were calcinedat1250 1C and sinteredat1375–1425 1C. The structure of the system was analyzed using ...
Synthesis, structure analysis, and microwave dielectric properties of LnTiSb(x)Ta(1-x)O(6) (Ln=Ce, Pr, and Nd) ceramics

Padma Kumar, H; Shyla Joseph; Sam Solomon; Manoj Raama Varma; Thomas, J K (Wiley, 2008)

LnTiSb(x)Ta(1-x)O(6) ceramics were prepared by the conventional solid-state ceramic route for x=0, 0.05, 0.1, 0.15, and 0.2. The structures of the materials were analyzed using X-ray diffraction techniques. The cell ...

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