Non-carbonate clay samples, fired in steps of 50 °C between 600 °C and 1000 °C,were examined through electron paramagnetic resonance (EPR) techniques (X- and Q-Band pulsed- and cw-EPR). X-band pulsed EPR and Q-Band pulsed- and cw-EPR techniques were able to spot 55Mn(II) signals out of the large iron background in the full range of firing temperatures, allowing one to follow the phase transformations through the evolution of the manganese signal. Q-Band pulsed EPR turned out to be particularly suitable to detect even small amounts of this ion in calcite, while the 55Mnhyperfine coupling constant, determined through Q-Band cw-EPR, could be used to detect transitions to the glassy phase.
Probing firing-induced changes in non-carbonate clay through Mn-55 EPR techniques
Nodari L;Gualtieri S;
2016
Abstract
Non-carbonate clay samples, fired in steps of 50 °C between 600 °C and 1000 °C,were examined through electron paramagnetic resonance (EPR) techniques (X- and Q-Band pulsed- and cw-EPR). X-band pulsed EPR and Q-Band pulsed- and cw-EPR techniques were able to spot 55Mn(II) signals out of the large iron background in the full range of firing temperatures, allowing one to follow the phase transformations through the evolution of the manganese signal. Q-Band pulsed EPR turned out to be particularly suitable to detect even small amounts of this ion in calcite, while the 55Mnhyperfine coupling constant, determined through Q-Band cw-EPR, could be used to detect transitions to the glassy phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
