Thermal behaviour of davyne-group minerals |
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| Authors: | Elena Bonaccorsi Paola Comodi Stefano Merlino |
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| Institution: | 1. Dipartimento di Scienze della Terra, Via S. Maria 53, I-56126, Pisa, Italy
2. Dipartimento di Scienze della Terra, Piazza Università, I-06100, Perugia, Italy
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| Abstract: | The thermal behaviour of microsommite (MC), davyne from Vesuvius (DV) and from Zabargad (DZ) was determined by X-ray single crystal data obtained employing a microfurnace connected to a four-circle diffractometer. Upon heating, the a parameter increased linearly, with similar thermal expansion rates for the three samples: the mean linear expansion coefficients, 
a
, were 10.2(3)·10-6, 13.4(7)·10-6, 15.1(8)·10-1 K-1 for MC, DV and DZ respectively.At about 473 K both MC and DZ showed a discontinuity in the expansion of the c parameter. The mean linear expansion coefficient,
c
, changed abruptly from 16(4)·10-6 K-1 for both minerals below the discontinuity to 2(1)·10-6 and 3(1)·10-6 K-1 for MC and DZ, respectively, above the discontinuity. In DV, however, the
c
coefficient was constant between 293 und 827 K and equal to 1(2)·10-6 K-1. |
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