Research Themes +
Energy Technologies Area (ETA) researchers are continually building on the strong scientific foundation we have developed over the past 50 years. We address the world’s most pressing climate challenges by bringing to market energy-efficient innovations across the buildings, transportation, and industrial sectors. ETA is at the forefront of developing better batteries for electric vehicles; improving the country's aging electrical grid and innovating distributed energy and storage solutions; developing grid-interactive, efficient buildings; and providing the most comprehensive market and data analysis worldwide for renewable technologies like wind and solar.
Strategic Initiatives +
The Energy Technologies Area (ETA) Strategic Plan is the guiding force for our research and development for the next ten years. It clearly charts a path toward clean-energy solutions and focuses on five detailed Strategic Initiatives. The Plan provides an in-depth look at how ETA is accelerating research to provide affordable, clean energy to all while accomplishing deep, economy-wide decarbonization, looking to avoid a rise in global average temperature while simultaneously developing solutions to increase humanity's resilience to extreme weather volatility.
Publications
News +
For media inquiries,
please contact ETA
Interim Communications Manager
Kiran Julin

kjulin@lbl.gov
About Us +
The Energy Technologies Area (ETA) is unique in translating fundamental scientific discoveries into scalable technology adoption. Our approach combines an understanding of the marketplace and the role of state and federal regulation and policies. ETA's research drives real-world, practical results that affect and improve the everyday lives of Americans and those across the globe. Saving energy and battling the Climate Crisis are key to the foundation of our research, which is driven by technoeconomic analysis and in-lab experimentation and discovery.

Raman spectra of bismuth cuprate high-Tc superconductors and 3d-metal-substituted phases

Publication Type

Journal Article

Authors

Farrow, L.A, Ramamoorthy Ramesh, J.-M Tarascon

DOI

10.1103/PhysRevB.43.418

Abstract

Raman spectra are presented for Bi2Sr2CuO6+y, Bi2Sr2CaCu2O8+y, and compounds formed by cationic substitution of Cu by Fe, Mn, and Co. For n=1 materials, the spectra show a greater number of modes than those predicted by group theory using the undistorted pseudotetragonal unit cell. These extra modes, however, are consistent with group-theory predictions based on the space group of the supercell of Bi2Sr2CoO6+y, which is caused by commensurate modulation over several periods of the smaller unit cell. Similar analysis is made of the supercell of Bi2Sr2SrFe2O8+y; predictions are consistent with the rearrangement of low-frequency modes as compared with Bi2Sr2CaCu2O8+y. Accompanying changes in oxygen stoichiometry cause strong shifts in the corresponding high-frequency oxygen stretch modes in both n=1 and 2 materials. Additional substitution of strontium by calcium in n=2 compounds leads to a more disordered structure, with consequent broadening of all modes in the spectrum. Overall, consideration of the supercell structure where it exists is essential in interpreting Raman spectra from the superconducting cupric oxides and their substituted compounds. © 1991 The American Physical Society.

Journal

Physical Review B

Volume

Year of Publication

1991

ISSN

01631829

Notes

cited By 11

Research Areas

Ramesh Lab