EFFECT OF Ca SUBSTITUTION ON SUPERCONDUCTING AND STRUCTURAL PROPERTIES OF Gd1− XPrXBa2Cu3O7−δ

The effect of Ca substitution on the electrical and structural properties in high and low density Y(Ba1-xCax)2Cu3Oδ where x = 0.00, 0.10, 0.20 and 0.30 via solid state reaction method has been investigated. The electrical properties, elemental analysis, and structural identification were measured by the four-point probe technique, energy dispersive x-ray (EDX) and X-ray diffraction (XRD) respectively. The electrical properties such as critical temperature (Tc) and critical current density (Jc) were found to be strongly dependent in both high and low densities Y(Ba1-xCax)2Cu3O7-δ. These parameters were decreased monotonously with the increasing of Ca substitution. An obvious results of the Ca-doped samples can be seen in x = 0.20 where Tc zero of high density sample is 77 K, which is higher than that of the low density sample that occurred at 73 K. Meanwhile, Jc at 60 K for high density is 1.842 A/cm2 compared to 1.410 A/cm2 in low density sample. EDX analysis confirmed the existence of Ca in all doped samples. The crystallographic structure remained orthorhombic and the volume of unit cell increased towards further increased of Ca concentration.

Download Full-text

Geometric structural properties of bonded layers of chemically modified silicas

Journal of Chromatography A ◽

10.1016/s0021-9673(01)91460-8 ◽

1988 ◽

Vol 447 (3) ◽

pp. 103-116 ◽

Cited By ~ 2

Author(s):

A Fadeev

Keyword(s):

Structural Properties ◽

Chemically Modified ◽

Chemically Modified Silicas

Download Full-text

Electronic, vibrational and structural properties of alkali halide clusters

Physica B Condensed Matter ◽

10.1016/s0921-4526(84)92608-5 ◽

1984 ◽

Vol 127 (1-3) ◽

pp. 214-218 ◽

Cited By ~ 14

Author(s):

T MARTIN

Keyword(s):

Structural Properties ◽

Alkali Halide

Download Full-text

Newborn's Preference for Faces

European Psychologist ◽

10.1027/1016-9040.1.3.200 ◽

1996 ◽

Vol 1 (3) ◽

pp. 200-205 ◽

Cited By ~ 12

Author(s):

Carlo Umiltà ◽

Francesca Simion ◽

Eloisa Valenza

Keyword(s):

Visual System ◽

Structural Properties ◽

Sensory Properties ◽

Human Face ◽

System Experiment ◽

Face Experiment

Four experiments were aimed at elucidating some aspects of the preference for facelike patterns in newborns. Experiment 1 showed a preference for a stimulus whose components were located in the correct arrangement for a human face. Experiment 2 showed a preference for stimuli that had optimal sensory properties for the newborn visual system. Experiment 3 showed that babies directed their attention to a facelike pattern even when it was presented simultaneously with a non-facelike stimulus with optimal sensory properties. Experiment 4 showed the preference for facelike patterns in the temporal hemifield but not in the nasal hemifield. It was concluded that newborns' preference for facelike patterns reflects the activity of a subcortical system which is sensitive to the structural properties of the stimulus.

Download Full-text