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Title: Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures

Abstract

Reduced strontium barium niobate, Sr xBa 1-xNb 2O 6 (SBN), is a potential candidate for oxide thermoelectrics. In order to understand the effects of oxygen reduction on the structure and properties of SBN, room temperature Raman spectra of reduced and unreduced crystals with composition x=0.61 (SBN61) have been measured, fitted and compared, for incident light polarized successively along the crystallographic a and c-axes. Unexpectedly, the low frequency spectra (<200 cm -1) of reduced SBN are found to display much better resolved and intense peaks than those of unreduced SBN, suggestive of a more ordered and compact lattice arrangement in reduced SBN. Shape changes of certain peaks and the disappearance or appearance of other peaks (30 cm -1/1000 cm -1) are also observed as a result of reduction. Comparison of the experimental spectra and fits of the unreduced and reduced crystals are suggestive of a redistribution of the remaining oxygen anions, structural rearrangements and the development of super- or inter-growth structures in reduced SBN. The reduced spectra are found to be very similar to the published spectra of the H-form of niobium oxide, H-Nb 20 5, which is made up of a regular block arrangement of corner-sharing and edge-sharing oxygen octahedra.more » These structural changes may play an important role in the enhanced electrical conductivity of reduced SBN.« less

Authors:
 [1]; ORCiD logo [1];  [2];  [3]
  1. Lehigh Univ., Bethlehem, PA (United States)
  2. Pennsylvania State Univ., University Park, PA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
1530528
Report Number(s):
SAND-2019-7014J
Journal ID: ISSN 0377-0486; 676650
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Raman Spectroscopy
Additional Journal Information:
Journal Volume: 49; Journal Issue: 11; Journal ID: ISSN 0377-0486
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Primrose, Michael Shoji, Toulouse, Jean, Bock, Jonathan, and Randall, Clive. Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures. United States: N. p., 2018. Web. doi:10.1002/jrs.5471.
Primrose, Michael Shoji, Toulouse, Jean, Bock, Jonathan, & Randall, Clive. Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures. United States. doi:10.1002/jrs.5471.
Primrose, Michael Shoji, Toulouse, Jean, Bock, Jonathan, and Randall, Clive. Tue . "Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures". United States. doi:10.1002/jrs.5471. https://www.osti.gov/servlets/purl/1530528.
@article{osti_1530528,
title = {Raman spectroscopy study of reduced strontium barium niobate (SBN61) and hints of supergrowth or intergrowth structures},
author = {Primrose, Michael Shoji and Toulouse, Jean and Bock, Jonathan and Randall, Clive},
abstractNote = {Reduced strontium barium niobate, SrxBa1-xNb2O6 (SBN), is a potential candidate for oxide thermoelectrics. In order to understand the effects of oxygen reduction on the structure and properties of SBN, room temperature Raman spectra of reduced and unreduced crystals with composition x=0.61 (SBN61) have been measured, fitted and compared, for incident light polarized successively along the crystallographic a and c-axes. Unexpectedly, the low frequency spectra (<200 cm-1) of reduced SBN are found to display much better resolved and intense peaks than those of unreduced SBN, suggestive of a more ordered and compact lattice arrangement in reduced SBN. Shape changes of certain peaks and the disappearance or appearance of other peaks (30 cm-1/1000 cm-1) are also observed as a result of reduction. Comparison of the experimental spectra and fits of the unreduced and reduced crystals are suggestive of a redistribution of the remaining oxygen anions, structural rearrangements and the development of super- or inter-growth structures in reduced SBN. The reduced spectra are found to be very similar to the published spectra of the H-form of niobium oxide, H-Nb205, which is made up of a regular block arrangement of corner-sharing and edge-sharing oxygen octahedra. These structural changes may play an important role in the enhanced electrical conductivity of reduced SBN.},
doi = {10.1002/jrs.5471},
journal = {Journal of Raman Spectroscopy},
number = 11,
volume = 49,
place = {United States},
year = {2018},
month = {9}
}

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