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

Primrose, Michael Shoji; Toulouse, Jean; Bock, Jonathan; Randall, Clive

doi:10.1002/jrs.5471

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

Journal Article · Tue Sep 04 00:00:00 EDT 2018 · Journal of Raman Spectroscopy

DOI:https://doi.org/10.1002/jrs.5471· OSTI ID:1530528

Primrose, Michael Shoji ^[1]; ^[1]; Bock, Jonathan ^[2]; Randall, Clive ^[3]

Lehigh Univ., Bethlehem, PA (United States)
Pennsylvania State Univ., University Park, PA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Pennsylvania State Univ., University Park, PA (United States)

Reduced strontium barium niobate, Sr_xBa_1-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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: National Science Foundation; USDOE

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1530528

Report Number(s):: SAND--2019-7014J; 676650

Journal Information:: Journal of Raman Spectroscopy, Journal Name: Journal of Raman Spectroscopy Journal Issue: 11 Vol. 49; ISSN 0377-0486

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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