EPR parameters and defect structures of the off-center Ti3+ ion on the Sr2+ site in neutron-irradiated SrTiO3 crystal

Yuan, Zheng; Wu, Xiao‐Xuan; He, Ling; Zheng, Wen-Chen

doi:10.1016/j.jpcs.2007.04.001

Cited by 14 publications

(5 citation statements)

References 28 publications

(36 reference statements)

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“…16 The lattice parameters (a and c) collected from the XRD data using Bragg's law by the relation applied for the tetragonal crystal symmetry as given below. 17 ( The calculated lattice parameters and cell volume are shown in Table 2; there is a good agreement between the calculated lattice parameters and cell volume with standard values for anatase and rutile TiO 2 . However, a significant decrease in lattice parameters and cell volume was observed after reduction treatment, as a result of oxygen vacancies formation.…”

Section: Phase and Crystalline Size Featuressupporting

confidence: 53%

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Krupska¹,

Klymenko²,

Holovan³

et al. 2022

ChChT

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The method of low-temperature 1Н NMR spectroscopy is applied to study the hydrated properties of bio-nanocomposite created on the basis of the mixture of hydrophobic and hydrophilic silicas (АМ1-300 and А 300 with ratio of 1:1), water, n-decane, and yeast cells. The produced mixture of nanosilicas contributes to mitosis and cell growth. It is shown that the cause of activation of their vital processes may be related to the formation of the system of water polyassociates, which change the conditions of substance transport through the cell membranes, on the phase boundaries of solid particles and aqueous medium.

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Section: Phase and Crystalline Size Featuressupporting

confidence: 53%

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Krupska¹,

Klymenko²,

Holovan³

et al. 2022

ChChT

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Section: Resultsmentioning

confidence: 99%

“…This signal is characteristic for a paramagnetic Ti 3+ center in the distorted rhomboid oxygen ligand field. [28b,30] Since Ti 3+ center in cubic phase is tetragonal symmetry while in tetragonal phase is rhombic, [31] the signal at g = 1.979 can be ascribed to Ti 3+ in the tetragonal phase structure. [23] Therefore, it can be concluded that due to the lattice strain toward different directions originated from SC CO 2 treatment, the structure of SrTiO 3 is stretched from cubic to tetragonal phase.…”

Section: Structural Characterization Of Srtiomentioning

confidence: 99%

Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Gao

et al. 2023

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Abstract2D magnetic materials are ideal to fabricate magneto‐optical, magneto‐electric, and data storage devices, which are proposed to be critical to the next generation of information technologies. Benefited from their labile structures, 2D perovskites are amenable for magnetic manipulation through structural optimization. In this work, 2D room‐temperature ferromagnetic SrTiO3 is achieved through straining effect induced by supercritical carbon dioxide (SC CO2). According to experimental results, the cubic phase of SrTiO3 is converted to tetragonal with exposure of (110), (200), (111), and (211) planes over the SC CO2 treatment, leading to significant ferromagnetic enhancement. Theoretical calculations illustrate that over the conversion from cubic to tetragonal, the electronic structure of SrTiO3 is significantly modulated. Specifically, the spin density of planes of (200), (111), and (211) is enhanced, presumably due to the stabilization of the highest occupied molecular orbital over straining by SC CO2, leading to magnetic optimizations. This work suggests that magnetic optimization can be achieved from SC CO2‐induced electronic structure modulation.

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“…Since the discovery of defect-induced magnetism (DIM) in different materials above room temperature, e.g., in graphite, several oxide systems, − or SiC, a new line of research in the study of room-temperature ferromagnetism (FM) started for nominally nonmagnetic semiconductors . Among the different methods to introduce defects, i.e., UV-irradiation, − vacuum annealing, , high-temperature annealing (above 500 K), reducing conditions (C), plasma treatment, laser, and highly energetic particle bombardment, − hydrogenation has received considerable scientific appreciation due to the remarkable changes in physical and chemical properties of materials. − Particularly, hydrogenated TiO 2 exhibits drastic changes in optical, electrical, and magnetic properties attributed to the highly reactive nature of hydrogen and that its small atomic size eases the interaction with different lattice sites of the host material…”

Section: Introductionmentioning

confidence: 99%

Observation of Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of Anatase TiO₂

et al. 2021

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The structural, electronic, and magnetic properties of anatase TiO 2 samples annealed under different hydrogen pressures are reported. By combining X-ray photoelectron spectroscopy (XPS), Raman, UV−vis, and X-ray absorption near-edge structure (XANES) spectroscopies, evidence of hydrogen incorporation was detected in the anatase structure. Short-time high-pressure hydrogen treatment favors the production of interstitial hydrogen, which, located close to a Ti 4+ ion, transfers charge to it, occupying unoccupied 3d levels. Longtime hydrogenation treatments (10 h) help to rebuild the structure of anatase and heal defects, with hydrogen occupying mainly oxygen vacancies. The presence of reduced Ti (4−δ)+ ions gives the sample its magnetic character at room temperature. Our results show that only a small fraction of the sample is magnetic (probably a superficial region affected by the hydrogenation) but the local magnetization is strong (in the order of hundreds of kA/m). By the choice of pressure and duration of treatment in a hydrogen atmosphere, it is possible to change the magnetic characteristics of the sample.

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EPR parameters and defect structures of the off-center Ti3+ ion on the Sr2+ site in neutron-irradiated SrTiO3 crystal

Cited by 14 publications

References 28 publications

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Observation of Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of Anatase TiO₂

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EPR parameters and defect structures of the off-center Ti3+ ion on the Sr2+ site in neutron-irradiated SrTiO3 crystal

Cited by 14 publications

References 28 publications

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Hydrated Properties of Composite Systems for Water and Soil Remediation on the Basis of Nanosilicas and Yeast Cells

Strong Ferromagnetic Manipulation of SrTiO3 from CO2‐Straining Effect on Electronic Structure Modulation

Observation of Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of Anatase TiO2

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Strong Ferromagnetic Manipulation of SrTiO₃ from CO₂‐Straining Effect on Electronic Structure Modulation

Observation of Room-Temperature Ferromagnetism Induced by High-Pressure Hydrogenation of Anatase TiO₂