HIGH PRESSURE ELECTRICAL RESISTIVITY STUDY ON ORTHORHOMBIC SnTe1−xSx

1996 ◽  
Vol 10 (10) ◽  
pp. 459-465
Author(s):  
S. ARIPONNAMMAL ◽  
S. NATARAJAN

Electrical resistivity measurements under pressure and lattice parameter study on SnTe 1–xSx(0.5≤x≤1) are reported here. The structure of these samples is confirmed by the theoretical calculation of X ray intensities using Lazy-Pulverix programme. The electrical resistivity decreases with the increase of pressure and also with the decrease of sulphur concentration. High pressure electrical resistivity study has produced more evidence that the compounds are layered material.

2007 ◽  
Vol 21 (11) ◽  
pp. 675-678 ◽  
Author(s):  
S. ARIPONNAMMAL ◽  
R. SELVA VENNILA ◽  
S. RADHIKA ◽  
P. M. USHASREE

Zinc thiourea chloride (ZTC) crystals were crystallized by slow evaporation technique. The lattice parameters of the grown crystals were determined by angle dispersive X-ray powder diffraction technique (XRD) and the structure was confirmed. High pressure electrical resistivity study was carried out on this crystal and the results are reported here.


1997 ◽  
Vol 11 (26n27) ◽  
pp. 1189-1192 ◽  
Author(s):  
S. Ariponnammal ◽  
S. Natarajan

The study of rare-earth monochalcogenides have received much attention because of their interesting electrical properties. They crystallize in the NaCl type structure and are semiconducting if the rare earth ion is in the divalent state and metalic if trivalent state. The effect of substitution of trivalent rare earth ion in divalent rare earth has been studied. We present the results of electrical resistivity measurements and lattice parameter study on Sm0.85Nd0.15Se . The structure of the sample is confirmed by the theoretical calculation of X-ray intensities using Lazy-Pulverix programme. The electrical resistivity is found to be decreasing with the increase of pressure.


1996 ◽  
Vol 197 (1) ◽  
pp. K1-K4 ◽  
Author(s):  
S. Ariponnammal ◽  
C. Venkateswaran ◽  
S. Natarajan

2006 ◽  
Vol 20 (29) ◽  
pp. 4885-4890
Author(s):  
R. SELVA VENNILA ◽  
S. REZA GHORBANI ◽  
N. VICTOR JAYA

High pressure-high temperature electrical resistivity study on composition-controlled Nd 0.9 Ca 0.1 Ba 2 Cu 3 O 7-δ high T c superconductor (HTSC) is carried out by a four-probe technique using Bridgman anvils. A simple heating coil arrangement is used for heating the samples. Electrical resistivity behavior under pressure (up to a maximum of 8 GPa) at various temperatures (up to a maximum of 523 K) were studied and reported in this paper. Simulation of energy dispersive X-ray diffraction confirms substitution of calcium at the Nd site of Nd -123. Variation of the electrical resistivity under pressure is compared with that of the structural changes and the bulk modulus was determined.


1994 ◽  
Vol 08 (28) ◽  
pp. 1781-1790 ◽  
Author(s):  
F.S. TERRA

X-ray diffraction analysis, electrical resistivity measurements at room temperature, and differential thermal analysis (DTA) were carried out for γ-irradiated Ni 0.65 Zn 0.35 Cu xFe2−x O 4 spinel ferrite samples. It was found that the lattice parameter decreased, i.e. the theoretical density increased, while the electrical resistivity decreased. From the DTA analysis there is an endothermic peak at 100–130º C due to internal stress created by γ radiations as a result of lattice defects formation.


2008 ◽  
Vol 403 (5-9) ◽  
pp. 1375-1377 ◽  
Author(s):  
V.H. Tran ◽  
R.T. Khan ◽  
E. Bauer ◽  
P. Rogl

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