The effect of annealing on the luminescence decay-time of synthetic calcite:Mn |
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| Authors: | Roger Mason Maynard Clouter Richard Goulding |
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| Institution: | (1) Department of Earth Sciences, Memorial University of Newfoundland, St. John’s, NF, A1B 3X5, Canada;(2) Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John’s, NF, A1B 3X7, Canada |
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| Abstract: | Calcite was synthesized by four methods, and the luminescence decay-time was measured for nine samples before and after heating
hydrothermally in the temperature range 200–400°C. Decay-time data were collected between room temperature and approximately
15 K. The decay time at room temperature is approximately 50 ms, with little difference between a given calcite before and
after hydrothermal treatment. The decay time at 15 K is always greater than at room temperature as the effect of thermal quenching
diminishes. Differences in decay time before and after heating are more apparent at low temperature owing to this reduction
in thermal quenching. The decay time decreased significantly in two samples, and an increase in decay time was observed in
the remaining seven samples following heating. Among the latter group, the change in decay time was insignificant in three
samples. The results are compared with previous data in which it was shown that the effect of heating is to increase the intensity
of luminescence. |
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