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Title: Electronic structure of barium strontium titanate by soft-x-ray absorption spectroscopy

Abstract

Perovskite-type titanates, such as Strontium Titanate (STO), Barium Titanate (BTO), and Lead Titanate (PTO) have been widely studied because they show good electric and optical properties. In recent years, thin films of Barium Strontium Titanate (BST) have been paid much attention as dielectrics of dynamic random access memory (DRAM) capacitors. BST is a better insulator with a higher dielectric constant than STO and can be controlled in a paraelectric phase with an appropriate ratio of Ba/Sr composition, however, few studies have been done on the electronic structure of the material. Studies of the electronic structure of such materials can be beneficial, both for fundamental physics research and for improving technological applications. BTO is a famous ferroelectric material with a tetragonal structure, in which Ti and Ba atoms are slightly displaced from the lattice points. On the other hand, BST keeps a paraelectric phase, which means that the atoms are still at the cubic lattice points. It should be of great interest to see how this difference of the local structure around Ti atoms between BTO and BST effects the electronic structure of these two materials. In this report, the authors present the Ti L{sub 2,3} absorption spectra of STO, BTO,more » and BST measured with very high accuracy in energy of the absorption features.« less

Authors:
 [1]; ; ;  [2]
  1. Mitsubishi Electric Co., Hyogo (Japan)
  2. Ernest Orlando Lawrence Berkeley National Lab., CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
OSTI Identifier:
603471
Report Number(s):
LBNL-39981
ON: DE97007345; TRN: 98:009506
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Apr 1997; Related Information: Is Part Of Advanced light source: Compendium of user abstracts 1993--1996; PB: 622 p.
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; 36 MATERIALS SCIENCE; BARIUM COMPOUNDS; STRONTIUM TITANATES; ELECTRONIC STRUCTURE; ABSORPTION SPECTROSCOPY

Citation Formats

Uehara, Y., Underwood, J.H., Gullikson, E.M., and Perera, R.C.C.. Electronic structure of barium strontium titanate by soft-x-ray absorption spectroscopy. United States: N. p., 1997. Web. doi:10.2172/603471.
Uehara, Y., Underwood, J.H., Gullikson, E.M., & Perera, R.C.C.. Electronic structure of barium strontium titanate by soft-x-ray absorption spectroscopy. United States. doi:10.2172/603471.
Uehara, Y., Underwood, J.H., Gullikson, E.M., and Perera, R.C.C.. Tue . "Electronic structure of barium strontium titanate by soft-x-ray absorption spectroscopy". United States. doi:10.2172/603471. https://www.osti.gov/servlets/purl/603471.
@article{osti_603471,
title = {Electronic structure of barium strontium titanate by soft-x-ray absorption spectroscopy},
author = {Uehara, Y. and Underwood, J.H. and Gullikson, E.M. and Perera, R.C.C.},
abstractNote = {Perovskite-type titanates, such as Strontium Titanate (STO), Barium Titanate (BTO), and Lead Titanate (PTO) have been widely studied because they show good electric and optical properties. In recent years, thin films of Barium Strontium Titanate (BST) have been paid much attention as dielectrics of dynamic random access memory (DRAM) capacitors. BST is a better insulator with a higher dielectric constant than STO and can be controlled in a paraelectric phase with an appropriate ratio of Ba/Sr composition, however, few studies have been done on the electronic structure of the material. Studies of the electronic structure of such materials can be beneficial, both for fundamental physics research and for improving technological applications. BTO is a famous ferroelectric material with a tetragonal structure, in which Ti and Ba atoms are slightly displaced from the lattice points. On the other hand, BST keeps a paraelectric phase, which means that the atoms are still at the cubic lattice points. It should be of great interest to see how this difference of the local structure around Ti atoms between BTO and BST effects the electronic structure of these two materials. In this report, the authors present the Ti L{sub 2,3} absorption spectra of STO, BTO, and BST measured with very high accuracy in energy of the absorption features.},
doi = {10.2172/603471},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 01 00:00:00 EST 1997},
month = {Tue Apr 01 00:00:00 EST 1997}
}

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