Determination of strontium and its relation to other alkaline earth elements in human brain samples

2005 ◽  
Vol 79 (1-2) ◽  
pp. 375-381 ◽  
Author(s):  
Ivett Peltz-Császma ◽  
Erzsébet Andrási ◽  
Alexandra Lásztity ◽  
Siegfried Kösel
Keyword(s):  
Human Brain ◽  
Alkaline Earth ◽  
Alkaline Earth Elements

Homogeneity area of Bi2Sr2CaCu2O8 - based solid solutions with substitution of alkaline earth elements by Nd and La

2000 ◽  
Vol 659 ◽  
Author(s):  
A.G. Veresov ◽  
A.V. Knotko ◽  
D.V. Korolyov ◽  
A.V. Garshev ◽  
V.I. Putlayev
Keyword(s):  
Alkaline Earth ◽  
Lattice Site ◽  
High Temperature Superconductors ◽  
Xrd Analysis ◽  
Stability Field ◽  
Ionic Radii ◽  
Alkaline Earth Elements ◽  
The Difference ◽  
Stability Area

ABSTRACTCreation of precipitates in bulk matrix to act as pinning centres is a prospective way to improve critical current density in high temperature superconductors. It is possible to generate such precipitates via partial decomposition of the supersaturated solid solution derived from a superconducting phase. To control this process one should go by a knowledge of stability field for these solutions. The objective of present work was determination of the homogeneity area of Bi2Sr2Ca1−xRxCu2O8+d and Bi2Sr2−xCaRxCu2O8+d (R = Nd, La). Semi-quantitative XRD analysis was used to evaluate phase composition of specimens quenched from various temperatures. It was found that solubility limits of Nd and La in Bi-2212 for cases of alkaline earth element substitution by rare earth elements with smaller ionic radii (substitution Ca by Nd; Sr by Nd and La) were the same (values of x are about 0.8). These limits are determined by fraction of Cu+ ions in lattice site attributed to Cu2+. In case of substitution of Ca by La stability area of 2212 was found to be much narrower (values of x about 0.3) compared to other substitutions. One ca n deduce this fact from the difference of Ca2+ and La3+ ionic radii.

Determination of alkaline-earth elements in glass by atomic absorption

1971 ◽  
Vol 28 (8) ◽  
pp. 507-508
Author(s):  
�. M. Sedykh ◽  
�. V. Igoshina
Keyword(s):  
Atomic Absorption ◽  
Alkaline Earth ◽  
Alkaline Earth Elements
Sign in / Sign up

Export Citation Format

Share Document