Origin of the superconductivity in the Y-Sr-Ru-O and Y-Sr-Cu-O systems

Why large porphyry Cu deposits like high Sr/Y magmas?

Porphyry systems supply most copper and significant gold to our economy. Recent studies indicate that they are frequently associated with high Sr/Y magmatic rocks, but the meaning of this association remains elusive. Understanding the association between high Sr/Y magmatic rocks and porphyry-type deposits is essential to develop genetic models that can be used for exploration purposes. Here we ...

PYROELECTRIC PROPERTIES OF La-Sr-Co-O/Pb-La-Ti-O/La-Sr-Co-O HETEROSTRUCTURES

The realization of a commercially viable, thin-film uncooled pyroelectric detector has been the focus of research for several years. As part of this effort, we show that a conventional metallic electrode system (typically Pt) can be replaced with a conductive oxide such as LaxSr(1–x)CoO3 (LSCO). In addition to being crystallographically compatible with the lead-based, pyroelectric oxides such a...

Electrical conductivity and defect chemistry of Ba x Sr 1 x Co y Fe 1 y O 3 d perovskites

Bulk BaxSr1 xCoyFe1 yO3 d compositions (BSCF) were synthesized by the solid-state reaction method. The electrical conductivity of ceramic bars was measured using a dc four-probe method as a function of temperature in air up to 970 °C. All compositions showed thermally activated p-type semi-conductivity up to ~450 °C and then a transition to metal-like conductivity. The smallpolaron hopping p-ty...

Suppression of Sr surface segregation in La(1-x)Sr(x)Co(1-y)Fe(y)O(3-δ): a first principles study.

Based on systematic first principles calculations, we investigate Sr surface segregation (SSS) in La(1-x)Sr(x)Co(1-y)Fe(y)O(3-δ) (LSCF) (a typical perovskite ABO(3) compound), a bottleneck causing efficiency degradation of solid oxide fuel cells. We identify two basic thermodynamic driving forces for SSS and suggest two possible ways to suppress SSS: applying compressive strain and reducing sur...

بررسی تاثیر سرب و زمان پخت برروی خواص ابررسانای سرامیکی Bi-Sr-Ca-Cu-O