Local structure of gadolinium in oxyfluoride glass matrices containing SrF2 and BaF2 crystallites

Antuzevičš, Andris; Ķemere, Meldra; Ignatāns, Reinis

doi:10.1016/j.jnoncrysol.2016.07.015

Cited by 9 publications

(17 citation statements)

References 34 publications

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“…At high concentration, various forms of composite defects such as gadolinium ion pairs and clusters may also be present. Gd 3+ in oxyfluoride glass ceramics containing fluorite structure crystalline phase have been studied recently [19,20]. Main results for compositions containing CaF 2 , SrF 2 and BaF 2 are summarized in Fig.…”

Section: +mentioning

confidence: 99%

“…7. When Gd 3+ replaces the similarly sized Ca 2+ ions in glass ceramics containing CaF 2 , the EPR spectrum is dominated by Gd 3+ in local cubic symmetry crystal field [19], whereas substitution of significantly larger Ba 2+ ions in glass ceramics containing BaF 2 leads to an EPR signal characterized by SH parameters for trigonal site symmetry [20]. To summarize, EPR spectral features of Gd 3+ ions are sensitive to the local environment and are effective for detecting the presence of crystalline phase in glass ceramics.…”

Section: +mentioning

confidence: 99%

“…A recent study [39], in particular, focuses on monitoring the valence state of europium ions in different composition glass ceramics containing SrF 2 . Sharp lines in the EPR spectra can be observed after the heat treatment of the precursor glass at high temperatures, where Eu 3+ → Eu 2+ reduction and incorporation into crystalline phases is efficient, [19], SrF 2 and BaF 2 [20] nanocrystals.…”

Section: +mentioning

confidence: 99%

“…Absorption and luminescence spectra, on the other hand, can indicate changes in the local environment around the luminescence centres, however, structure sensitive magnetic resonance spectroscopy techniques should be employed to reveal the detailed nature of defects in glass ceramics. Electron paramagnetic resonance (EPR) is one of the most convenient and informative methods for the study of point defects in crystals and glasses [1][2][3][4][5][6][7][8][9][10][11], however, there has been only a limited number of applications to glass ceramics [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Crystalline phase detection in glass ceramics by EPR spectroscopy

Antuzevičš

Rogulis

Fedotovs

et al. 2018

Low Temperature Physics

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The advances of EPR spectroscopy for the detection of activators as well as determining their local structure in the crystalline phase of glass ceramics is considered. The feasibility of d-element (Mn 2+ , Cu 2+ ) and f-element (Gd 3+ , Eu 2+ ) ion probes for the investigation of glass ceramics is discussed. In the case of Mn 2+ , the information is obtained from the EPR spectrum superhyperfine structure, for Gd 3+ and Eu 2+ probes -from the EPR spectrum fine structure, whereas for Cu 2+ ions the changes in the EPR spectrum shape could be useful. The examples of EPR spectra of the above-mentioned probes in oxyfluoride glass ceramics are illustrated. PACS: 76.30.-v Electron paramagnetic resonance and relaxation; 61.72.Hh Indirect evidence of dislocations and other defects.

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Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: +mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Crystalline phase detection in glass ceramics by EPR spectroscopy

Antuzevičš

Rogulis

Fedotovs

et al. 2018

Low Temperature Physics

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“…In the initial Gd-doped glass-ceramics no MCD-EPR signals of the cubic Gd 3+ could be observed. The embedding of the Gd 3+ in the cubic symmetry has been observed also in the SrF 2 crystallites (not shown), however, the other symmetry environments are present as well [12].…”

Section: Resultsmentioning

confidence: 75%

Optical Detection of Paramagnetic Centres in Activated Oxyfluoride Glass-Ceramics

et al. 2018

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Electron paramagnetic resonance (EPR), magnetic circular dichroism (MCD) and EPR detected via MCD (MCD-EPR) investigations have been performed on rare-earth activated oxyfluoride glasses and glass-ceramics. Er 3+ , Gd 3+ , and Mn 2+ activators in oxyfluoride glass-ceramics show paramagnetic MCD behaviour and the MCD-EPR has been detected. The results of the MCD-EPR measurements for the Er-doped oxyfluoride glass-ceramics showed that Er 3+ ions in the CaF2 crystallites in these ceramics embed only in the cubic symmetry environment, similarly to the previous observations of cubic Gd 3+ centres in the glass-ceramics containing CaF2. Finally, the correlation of optics and paramagnetic centres is discussed for Mn-doped YAlO3 ceramics.

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EPR in glass ceramics

Antuzevičš

2019

Experimental Methods in the Physical Sciences

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Local structure of gadolinium in oxyfluoride glass matrices containing SrF2 and BaF2 crystallites

Cited by 9 publications

References 34 publications

Crystalline phase detection in glass ceramics by EPR spectroscopy

Crystalline phase detection in glass ceramics by EPR spectroscopy

Optical Detection of Paramagnetic Centres in Activated Oxyfluoride Glass-Ceramics

EPR in glass ceramics

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