Use of ultrasonically modulated electron resonance to study S-state ions in mineral crystals: Mn2+, Fe3+, in tremolite |
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| Authors: | Dennis G McGavin Ross A Palmer W Craighead Tennant Sean D Devine |
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| Institution: | 1. Chemistry Division, Department of Scientific and Industrial Research, Private Bag, Petone, New Zealand
2. Department of Scientific and Industrial Research, Physics and Engineering Laboratory, Lower Hutt, New Zealand
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| Abstract: | The use of ultrasonically modulated electron resonance (UMER) to study S-state ions in substitutional sites of mineral single crystals is discussed. Mn2+ and Fe3+ in natural single crystals of tremolite are used as examples. Combined electron paramagnetic resonance (EPR) and UMER measurements establish almost certainly that Mn2+ enters predominantly into the distorted M4 sites occupied by Ca2+ in the ideal tremolite structure and only to a minor extent into the M1, M2 and M3 sites normally occupied by Mg2+. Fe3+ in tremolite gives rise to the well known high spin resonance with g eff?4.3 but there is considerable uncertainty as to the site of the impurity ion. |
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