Abstract
The results of combined application of the neutron diffraction and acoustic emission methods for investigation of the physical properties of synthetic quartz and natural quartzite in a temperature range of α-β transition are given. In experiments, the quartzite sample was exposed to heating and uniaxial compression. Changes of the lattice spacings in quartzite were measured in a temperature range 540–620°C. On the basis of these measurements, the inner inner stresses are evaluated and found to exceed the applied stresses by several times. It is found that after the phase transition is finished, short bursts of acoustic emission (AE) occur which are two orders of magnitude more intense than the acoustic emissions produced by thermal cracking of the sample while the sample is heating up to the transition temperatures. An assumption is made that the anomalous behavior of the physical properties of quartz-containing rocks under relatively low pressures near the transition temperature can cause the formation of strong concentrators of local stresses comparable with the breaking point of the material, thereby initiating microcracking.
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Original Russian Text © A.N. Nikitin, R.N. Vasin, A.M. Balagurov, G.A. Sobolev, A.V. Ponomarev, 2006, published in Piss’ma v zhurnal Fizika Elementarnykh Chastits i Atomnogo Yadra, 2006, No. 1 (130), pp. 76–91.
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Nikitin, A.N., Vasin, R.N., Balagurov, A.M. et al. Investigation of thermal and deformation properties of quartzite in a temperature range of polymorphous α-β transition by neutron diffraction and acoustic emission methods. Phys. Part. Nuclei Lett. 3, 46–53 (2006). https://doi.org/10.1134/S1547477106010067
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DOI: https://doi.org/10.1134/S1547477106010067