Effect of a Ce3+ Codopant on the Gd3+ EPR Spectrum of SrF2 at Room Temperature

Abstract

Articles you may be interested inRoom temperature dielectric and magnetic properties of Gd and Ti co-doped BiFeO3 ceramics Room-temperature ferromagnetism in Co-doped CeO2 nanospheres prepared by the polyvinylpyrrolidone-assisted hydrothermal methodThe room temperature Gd3+ EPR spectrum in SrF2 containing Ce3+ as a second dopant exhibits three types of symmetry sites: cubic, trigonal, and tetragonal. Relative intensities of the spectra from these sites have been determined as a function of the Ce3+ codopant level in crystals having nominally 0.1 molar % of Gd3+. At low Ce3+ concentrations «0.1 molar %), the tetragonal-to-trigonal intensity ratio is 1.85± 0.25, with the cubic site intensity accounting for less than one tenth of the total observed intensity. At higher Ce3+ concentrations (up to 0.8 molar %), the cubic site intensity grows and the intensity of both axial sites decreases. This increase of cubic intensity is at variance with the generally accepted model of nonlocalized cubic compensation of the Gd3+, and a phenomenological explanation based on a local cubic phase in which rare earth ions are essentially surrounded with interstitial compensating fluorines is presented.

EPR characterization of erbium in glasses and glass ceramics

“…Structural changes detected via Gd 3+ probe spectra have been also demonstrated for other rare earth ions, e.g. Ce 3+ , La 3+ , Y 3+ [49][50][51], thus it could be a feasible strategy in the studies of systems containing erbium.…”

Eu3+ ion distribution in oxyfluoride glass nanocomposites

“…Furthermore, the addition of gadolinium does not interfere with the visible transmittance of the material because all optical transitions of Gd 3+ are in the ultraviolet region of electromagnetic spectrum. In the previous studies low concentrations of gadolinium co-dopants have been used to investigate the influence of primary dopant ions on their crystal structure [47][48][49][50][51][52][53]. Several effects were observed in the EPR spectra.…”

“…Several effects were observed in the EPR spectra. First, site symmetry of Gd 3+ centres in CaF 2 and SrF 2 crystals was dependent on the concentration of primary ions [47][48][49].…”

A brief review of co-doping

“…Investigations of infrared quantum counters [70] and infra red (IR) up-converting phosphors [71] were also performed, addressing the effects of co-doping of certain materials (such as CaF 2 and SrF 2 ) with rare earth elements or iron (Fe) [72][73][74].…”