ESR spectroscopy of FeIII ions in sodium silicate glasses

Dunaeva, E. S.; Ugolkova, E. A.; Ефимов, Н. Н.; Минин, В. В.; Новоторцев, В. М.

doi:10.1007/s11172-014-0394-0

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The lines of bivalent iron, due to a very strong spin-phonon interaction, were resolved in EPR spectra only for the specimens cooled to liquid helium temperature. The isotropic lines with g = 4.3 and 2.02 are the characteristics of ESR spectra of various glasses with an impurity of isolated Fe 3+ ions, including aluminosilicate ones 50–53 . It is considered that these signals are associated with two types of Fe 3+ ions isolated in the glass framework: (1) g = 4.3 − ions in purely rhombic strong crystal field, E/D = 1/3, D >> hν (D, E − parameters of axial and rhombic component of crystalline fields, hν ∼ 10 GHz); (2) g = 2.0 - ions in a strong axial field E/D = 0).…”

Section: Discussionmentioning

confidence: 99%

Spectroscopic features of ultrahigh-pressure impact glasses of the Kara astrobleme

Шумилова

Lutoev

Исаенко

et al. 2018

Sci Rep

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The state of substances under ultrahigh pressures and temperatures (UHPHT) now raises a special interest as a matter existing under extreme conditions and as potential new material. Under laboratory conditions only small amounts of micrometer-sized matter are produced at a pressure up to 100 GPa and at room temperature. Simultaneous combination of ultrahigh pressures and temperatures in a lab still requires serious technological effort. Here we describe the composition and structure of the UHPHT vein-like impact glass discovered by us in 2015 on the territory of the Kara astrobleme (Russia) and compare its properties with impact glass from the Ries crater (Germany). A complex of structural and spectroscopic methods presents unusual high pressure marks of structural elements in 8-fold co-ordination that had been described earlier neither in synthetic nor natural glasses. The Kara natural UHPHT glasses being about 70 Ma old have well preserved initial structure, presenting some heterogeneity as a result of partial liquation and crystallization differentiation where an amorphous component is proposed to originate from low level polymerization. Homogeneous parts of the UHPHT glasses can be used to deepened fundamental investigation of a substance under extreme PT conditions and to technological studies for novel material creations.

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Section: Discussionmentioning

confidence: 99%