Cubic zirconia, an elastically anisotropic material, has been irradiated with 300 keV Cs + ions and the irradiation-induced elastic strain has been measured using X-ray diffraction (XRD). In order to highlight the influence of the elastic properties on the strain level, two different cases have been investigated: (i) {100} vs. {111}-oriented zirconia single crystals and (ii) {100} zirconia vs. {100} strontium titanate. In the former case, raw experimental results show that {100} planes deform less than {111} planes. However, with a modelling that takes into account the effect of the elastic properties, it is demonstrated that the strain due to irradiation defects only is the same for both orientations (with a maximum value of ~0.8%). Combined use of this modelling and of a dedicated computer program for fitting XRD data allowed determining both defect concentration (~1%) and relaxation volume (~0.5 atomic volume). In the latter case, it is shown that elastic properties affect the measured strain in irradiated zirconia and strontium titanate. However, a difference between the two materials remains even taking into account this effect, confirming that different compounds of a same class of materials (namely ceramic oxides) can exhibit a different response to ion irradiation.
Abstract. The presence of residual stresses in thermal oxide layers has been recognized for a long time. In the present work, the mechanical fields for chromium oxide are investigated. An extended model is established to take into account the effects of temperature and thermal cycling for the calculation of oxide stress. Numerical results are given in order to predict the influence of different parameters, especially the dependence of some material parameters with temperature. This enables to make comparison with experimental results.Introduction.
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