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Publication detail

Spectroscopic studies of zinc manganese metaphosphate glasses
Year: 2016
Type of publication: článek v odborném periodiku
Name of source: Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B
Page from-to: 187-192
Titles:
Language Name Abstract Keywords
cze Spektroskopická studie zinečnato fosfátových skel s manganem Metafosfátová skla systému xMnO.(50−x)ZnO.50P2O5 byla připravená v celém kompozičním rozsahu 0≤x≤50. Jejich struktura vlastnosti byly studovány Ramanovou spektroskopií, elektronovou paramagnetickou rezonancí, UV-VIS spektroskopií, magnetickou susceptibilitou a DC vodivostí. Metafosforečnanová struktura skel byla zachována v celím kompozičním rozsahu. Bylo zjištěno, že MN je převážně v oxidačním stavu +II, ale barva skel je způsobena stopami Mn(+III). zinečnato fosfátových skla; mangan; Ramanova spektroskopi; ESR
eng Spectroscopic studies of zinc manganese metaphosphate glasses Metaphosphate glasses from the xMnO.(50−x)ZnO.50P2O5 system were prepared, spanning the whole composition range 0≤x≤50. Their structure and properties were studied by Raman spectroscopy, electron paramagnetic resonance, UV-Vis spectroscopy, magnetic susceptibility and DC conductivity. The metaphosphate structure of the glasses was maintained throughout the whole compositional range. Manganese was found to be predominantly in the +II oxidation state, but the colour of the glasses arises from traces of Mn(III). EPR spectra reveal that Mn(II) has slightly axially distorted octahedral coordination, with predominantly covalent Mn–O bonds in the xy-plane, whilst the bonds in the z-direction have a prevalently ionic character. The DC conductivity follows a simple Arrhenius relation, and the activation energy and pre-exponential factor are found to be compositionally independent, with mean values E*=1·13±0·05 eV and σo=4·3±2·1 Ω−1cm−1. The low value of σo indicates band tail conduction. Optical absorption spectra show that localised manganese states in the energy gap are responsible for the DC conductivity of these glasses. Spectroscopic studies; zinc manganese metaphosphate glasses; Rmaman spectra; ESR

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