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

The transparent conducting oxide, SnO2, is a promising optoelectronic material with predicted tailorable properties via pressure-mediated band gap opening. While such electronic properties are typically modeled assuming perfect crystallinity, disordering of the O sublattice under pressure is qualita...

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Détails bibliographiques
Publié dans:Journal of synchrotron radiation. - 1994. - 26(2019), Pt 4 vom: 01. Juli, Seite 1245-1252
Auteur principal: Sneed, Daniel (Auteur)
Autres auteurs: Kearney, John S C, Smith, Dean, Smith, Jesse S, Park, Changyong, Salamat, Ashkan
Format: Article en ligne
Langue:English
Publié: 2019
Accès à la collection:Journal of synchrotron radiation
Sujets:Journal Article EXAFS SnO2 XRD diamond anvil cell extreme conditions high pressure laser heating Tin Compounds stannic oxide KM7N50LOS6
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520 |a The transparent conducting oxide, SnO2, is a promising optoelectronic material with predicted tailorable properties via pressure-mediated band gap opening. While such electronic properties are typically modeled assuming perfect crystallinity, disordering of the O sublattice under pressure is qualitatively known. Here a quantitative approach is thus employed, combining extended X-ray absorption fine-structure (EXAFS) spectroscopy with X-ray diffraction, to probe the extent of Sn-O bond anharmonicities in the high-pressure cubic (Pa\bar{3}) SnO2 - formed as a single phase and annealed by CO2 laser heating to 2648 ± 41 K at 44.5 GPa. This combinational study reveals and quantifies a large degree of disordering in the O sublattice, while the Sn lattice remains ordered. Moreover, this study describes implementation of direct laser heating of non-metallic samples by CO2 laser alongside EXAFS, and the high quality of data which may be achieved at high pressures in a diamond anvil cell when appropriate thermal annealing is applied 
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650 4 |a XRD 
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700 1 |a Kearney, John S C  |e verfasserin  |4 aut 
700 1 |a Smith, Dean  |e verfasserin  |4 aut 
700 1 |a Smith, Jesse S  |e verfasserin  |4 aut 
700 1 |a Park, Changyong  |e verfasserin  |4 aut 
700 1 |a Salamat, Ashkan  |e verfasserin  |4 aut 
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