KFU. Card publication. Features of formation of Cr3+ paramagnetic centers in strontium titanate (SrTiO3) implanted with chromium ions

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FEDERAL UNIVERSITY

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FEATURES OF FORMATION OF CR3+ PARAMAGNETIC CENTERS IN STRONTIUM TITANATE (SRTIO3) IMPLANTED WITH CHROMIUM IONS

Form of presentation

Articles in Russian journals and collections

Year of publication

2020

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Authors, employees of KFU

Tagirov Lenar Rafgatovich, author

Yanilkin Igor Vitalevich, author

Bibliographic description in the original language

A.A. Sukhanov, I.V. Yanilkin, V.F. Valeev, V.I. Nuzhdin, R.I. Khaibullin, L.R. Tagirov, V.K. Voronkova. Features of formation of Cr3+ paramagnetic centers in strontium titanate (SrTiO3) implanted with chromium ions // Journal of Surface Investigation. X-Ray, Synchrotron and Neutron Techniques. – 2020. – V.14,N3. – P.551–554.

Annotation

We present results of structural (XPS) and magnetic resonance (EPR) studies of single-crystal plates of strontium titanate (SrTiO3) heavily doped with chromium utilizing ion implantation technique. It was shown that the temperature of the oxide matrix during ion implantation (300 or 900 K) significantly affects the valence state of the implanted chromium impurity (Cr0 or Cr3+) and the depth profiles of its distribution in the SrTiO3 matrix. Using the EPR method, it was established that as a result of implantation of chromium impurity at an elevated substrate temperature during irradiation, the dominating color centers in the surface implanted oxide layer appear in the form of trivalent chromium ions in a cubic environment with a g factor g = 1.976 and the value of the hyperfine coupling constant with the magnetic nucleus of 53Cr isotope, A = 16.2 × 10–4 cm–1. From a comparison of these data with parameters for the cubic Cr3+ impurity center in the SrTiO3 single crystal, it was concluded that this center is localized in the structural positions of titanium. Upon implantation of a chromium impurity in SrTiO3 at room temperature of the substrate, in addition to cubic Cr3+ centers, new signals were detected in the EPR spectra, apparently associated with the formation of oxygen vacancies in the implanted oxide. However, the number of these additional centers does not change significantly even after high-temperature heat treatment of samples in air at temperatures up to 900 K. It is noted that signals of this type also appear in the spectra of SrTiO3 samples obtained as a result of hot implantation and then subjected to high-temperature thermal annealing.

Keywords

Strontium titanate, chromium ion, ion implantation, electron paramagnetic resonance, oxygen vacancies, XPS, thermal annealing

The name of the journal

Journal of Surface Investigation

URL

https://www.springer.com/journal/11700

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=235488&p_lang=2

Resource files

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_final_Sukhanov_A.A.pdf	0,42	pdf	show / download

Full metadata record

Field DC	Value	Language
dc.contributor.author	Tagirov Lenar Rafgatovich	ru_RU
dc.contributor.author	Yanilkin Igor Vitalevich	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	A.A. Sukhanov, I.V. Yanilkin, V.F. Valeev, V.I. Nuzhdin, R.I. Khaibullin, L.R. Tagirov, V.K. Voronkova. Features of formation of Cr3+ paramagnetic centers in strontium titanate (SrTiO3) implanted with chromium ions // Journal of Surface Investigation. X-Ray, Synchrotron and Neutron Techniques. – 2020. – V.14,N3. – P.551–554.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=235488&p_lang=2	ru_RU
dc.description.abstract	Journal of Surface Investigation	ru_RU
dc.description.abstract	We present results of structural (XPS) and magnetic resonance (EPR) studies of single-crystal plates of strontium titanate (SrTiO3) heavily doped with chromium utilizing ion implantation technique. It was shown that the temperature of the oxide matrix during ion implantation (300 or 900 K) significantly affects the valence state of the implanted chromium impurity (Cr0 or Cr3+) and the depth profiles of its distribution in the SrTiO3 matrix. Using the EPR method, it was established that as a result of implantation of chromium impurity at an elevated substrate temperature during irradiation, the dominating color centers in the surface implanted oxide layer appear in the form of trivalent chromium ions in a cubic environment with a g factor g = 1.976 and the value of the hyperfine coupling constant with the magnetic nucleus of 53Cr isotope, A = 16.2 × 10–4 cm–1. From a comparison of these data with parameters for the cubic Cr3+ impurity center in the SrTiO3 single crystal, it was concluded that this center is localized in the structural positions of titanium. Upon implantation of a chromium impurity in SrTiO3 at room temperature of the substrate, in addition to cubic Cr3+ centers, new signals were detected in the EPR spectra, apparently associated with the formation of oxygen vacancies in the implanted oxide. However, the number of these additional centers does not change significantly even after high-temperature heat treatment of samples in air at temperatures up to 900 K. It is noted that signals of this type also appear in the spectra of SrTiO3 samples obtained as a result of hot implantation and then subjected to high-temperature thermal annealing.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Strontium titanate	ru_RU
dc.subject	chromium ion	ru_RU
dc.subject	ion implantation	ru_RU
dc.subject	electron paramagnetic resonance	ru_RU
dc.subject	oxygen vacancies	ru_RU
dc.subject	XPS	ru_RU
dc.subject	thermal annealing	ru_RU
dc.title	Features of formation of Cr3+ paramagnetic centers in strontium titanate (SrTiO3) implanted with chromium ions	ru_RU
dc.type	Articles in Russian journals and collections	ru_RU