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Title: Probing disorder in high-pressure cubic tin (IV) oxide: a combined x-ray diffraction and absorption study

Abstract

The transparent conducting oxide, SnO2, shows promise as an optoelectronic material, with predicted tailorable properties through pressuremediated band gap opening. While such electronic properties are typically modeled assuming perfect ordering, this work employs extended x-ray absorption fine structure (EXAFS) spectroscopy to probe anion disordering. We present high-pressure cubic (Pa3) SnO2 at 44.5GPa thoroughly annealed with direct CO2 laser heating, and extract Sn–O distances from EXAFS to reveal a high degree of disorder in O positions. This observation is in contrast with x-ray diffraction (XRD), which suggest a high degree of order. The use of CO2 laser heating allows for direct observations of displacement of light anions in a sample that is without anisotropic strain.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1530760
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Synchrotron Radiation
Additional Journal Information:
Journal Volume: 26; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
EXAFS; SnO2; XRD; diamond anvil cell; extreme conditions; high pressure; laser heating

Citation Formats

Sneed, Daniel, Kearney, John S. C., Smith, Dean, Smith, Jesse S., Park, Changyong, and Salamat, Ashkan. Probing disorder in high-pressure cubic tin (IV) oxide: a combined x-ray diffraction and absorption study. United States: N. p., 2019. Web. doi:10.1107/S1600577519003904.
Sneed, Daniel, Kearney, John S. C., Smith, Dean, Smith, Jesse S., Park, Changyong, & Salamat, Ashkan. Probing disorder in high-pressure cubic tin (IV) oxide: a combined x-ray diffraction and absorption study. United States. doi:10.1107/S1600577519003904.
Sneed, Daniel, Kearney, John S. C., Smith, Dean, Smith, Jesse S., Park, Changyong, and Salamat, Ashkan. Mon . "Probing disorder in high-pressure cubic tin (IV) oxide: a combined x-ray diffraction and absorption study". United States. doi:10.1107/S1600577519003904.
@article{osti_1530760,
title = {Probing disorder in high-pressure cubic tin (IV) oxide: a combined x-ray diffraction and absorption study},
author = {Sneed, Daniel and Kearney, John S. C. and Smith, Dean and Smith, Jesse S. and Park, Changyong and Salamat, Ashkan},
abstractNote = {The transparent conducting oxide, SnO2, shows promise as an optoelectronic material, with predicted tailorable properties through pressuremediated band gap opening. While such electronic properties are typically modeled assuming perfect ordering, this work employs extended x-ray absorption fine structure (EXAFS) spectroscopy to probe anion disordering. We present high-pressure cubic (Pa3) SnO2 at 44.5GPa thoroughly annealed with direct CO2 laser heating, and extract Sn–O distances from EXAFS to reveal a high degree of disorder in O positions. This observation is in contrast with x-ray diffraction (XRD), which suggest a high degree of order. The use of CO2 laser heating allows for direct observations of displacement of light anions in a sample that is without anisotropic strain.},
doi = {10.1107/S1600577519003904},
journal = {Journal of Synchrotron Radiation},
number = 4,
volume = 26,
place = {United States},
year = {2019},
month = {7}
}