NDLI: EPR study of the impurity paramagnetic centres in (CaO−Ga2O3−GeO2) glasses

Content Provider	Springer Nature Link
Author	Padlyak, B. V. Gutsze, A.
Copyright Year	1998
Abstract	The X-band EPR spectra of Cr3+, Mn2+, and Fe3+ impurity ions in glasses of (CaO−Ga2O3−GeO2) system are investigated in the 77÷300 K temperature range. The experimental data analysis yields the following results: (i) Impurity chromium ions are incorporated into the (CaO−Ga2O3−GeO2) glasses network in Cr3+ (3d3,4F3/2) paramagnetic valence state only and occupy the strong distorted oxygen coordinated octahedral sites. (ii) For all activated and non-activated (CaO−Ga2O3−GeO2) glasses the iron impurity is present at concentration roughly 0.01 wt.%. Isotropic EPR signals atg eff=4.29 andg eff=2.00 are assigned to Fe3+ (3d5,6S5/2) ions in the sites with strong rhombic distortion and in the sites with nearly cubic symmetry respectively. (iii) The manganese EPR spectrum in (CaO−Ga2O3−GeO2) glasses is weakly dependent on temperature, doping procedure as well as manganese concentration. EPR spectra of impurity manganese ions in glasses with Ca3Ga2Ge3O12 and Ca3Ga2Ge4O14 compositions are virtually identical and belong to Mn2+ (3d5,6S5/2) ions. Impurity manganese ions are incorporated into the (CaO−Ga2O3−GeO2) glass network as isolated Mn2+ centres and clusters of Mn2+ ions.
Starting Page	59
Ending Page	68
Page Count	10
File Format	PDF
ISSN	09379347
Journal	Applied Magnetic Resonance
Volume Number	14
Issue Number	1
e-ISSN	16137507
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solid State Physics Spectroscopy/Spectrometry Physical Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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