scholarly journals Oxygen vacancies in strontium titanate: A DFT+DMFT study

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Jaime Souto-Casares ◽  
Nicola A. Spaldin ◽  
Claude Ederer
Keyword(s):  
Strontium Titanate ◽  
Oxygen Vacancies

scholarly journals Dynamics of oxygen vacancies in strontium titanate

2015 ◽  
Vol 71 (a1) ◽  
pp. s64-s64
Author(s):  
M. Zschornak ◽  
J. Hanzig ◽  
H. Stöcker ◽  
C. Richter ◽  
M. Nentwich ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Oxygen Vacancies

scholarly journals Effect of thermochemical treatments on laser-induced luminescence spectra from strontium titanate: comparison with swift ion-beam irradiation experiments

2021 ◽  
Vol 75 (12) ◽  
Author(s):  
M. L. Crespillo ◽  
J. T. Graham ◽  
F. Agulló-López ◽  
Y. Zhang ◽  
W. J. Weber
Keyword(s):  
Strontium Titanate ◽  
Oxygen Vacancies ◽  
Ion Beam ◽  
Energy Levels ◽  
Electronic Energy ◽  
Luminescence Spectra ◽  
Optical Transitions ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Reducing Atmosphere

AbstractResults recently reported on the effect of thermochemical treatments on the (He-Cd) laser-excited emission spectra of strontium titanate (STO) are re-analyzed here and compared with results obtained under ion-beam irradiation. Contributing bands centered at 2.4 eV and 2.8 eV, which appear under laser excitation, present intensities dependent upon previous thermal treatments in oxidizing (O2) or reducing atmosphere (H2). As a key result, the emission band centered at 2.8 eV is clearly enhanced in samples exposed to a reducing atmosphere. From a comparison with the ionoluminescence data, it is concluded that the laser-excited experiments can be rationalized within a framework developed from ion-beam excitation studies. In particular, the band at 2.8 eV, sometimes attributed to oxygen vacancies, behaves as expected for optical transitions from conduction-band (CB) states to the ground state level of the self-trapped exciton center. The band at 2.0 eV reported in ion-beam irradiated STO, and attributed to oxygen vacancies, is not observed in laser-excited crystals. As a consequence of our analysis, a consistent scheme of electronic energy levels and optical transitions can now be reliably offered for strontium titanate. Graphical abstract

scholarly journals Effect of oxygen vacancies on intrinsic dielectric permittivity of strontium titanate ceramics

2018 ◽  
Vol 126 (5) ◽  
pp. 263-268 ◽  
Author(s):  
Takuya HOSHINA ◽  
Ryuichi SASE ◽  
Junji NISHIYAMA ◽  
Hiroaki TAKEDA ◽  
Takaaki TSURUMI
Keyword(s):  
Dielectric Permittivity ◽  
Strontium Titanate ◽  
Oxygen Vacancies ◽  
Effect Of Oxygen ◽  
Titanate Ceramics

scholarly journals Transparent amorphous strontium titanate resistive memories with transient photo-response

Nanoscale ◽  
2017 ◽  
Vol 9 (38) ◽  
pp. 14690-14702 ◽  
Author(s):  
Taimur Ahmed ◽  
Sumeet Walia ◽  
Jeeson Kim ◽  
Hussein Nili ◽  
Rajesh Ramanathan ◽  
...  
Keyword(s):  
Strontium Titanate ◽  
Transient Response ◽  
Oxygen Vacancies ◽  
Conductive Filament ◽  
Photo Response ◽  
Optical Excitations ◽  
Evolution Of Oxygen

Highly transparent SrTiO3 resistive memories with transient response to optical excitations are demonstrated and the evolution of oxygen vacancies with the location of a conductive filament is optically mapped.

scholarly journals In situ anion-doped epitaxial strontium titanate films

2020 ◽  
Vol 22 (42) ◽  
pp. 24796-24800
Author(s):  
M. Tyunina ◽  
O. Pacherova ◽  
N. Nepomniashchaia ◽  
V. Vetokhina ◽  
S. Cichon ◽  
...  
Keyword(s):  
Epitaxial Growth ◽  
Strontium Titanate ◽  
Oxygen Vacancies ◽  
Strained Films

Oxygen vacancies, hydrogen, or nitrogen are introduced in strontium titanate during the epitaxial growth of compressively strained films.

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