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A natural mixture of heavy rare earths oxides extracted from xenotime mineralhave been used to prepare large single crystals of high-temperatureREBa2Cu3O(7-\delta) superconductor grown using the CuO-BaO self-flux method.Its mechanical properties along the ab-plane were characterized usinginstrumented indentation. Hardness and elastic modulus were obtained by theOliver and Pharr method and corresponds to 7.4 \pm 0.2 GPa and in range 135-175GPa at small depths, respectively. Increasing the load promotes the nucleationof lateral cracks that causes a decrease in hardness and the measured elasticmodulus by instrumented indentation at higher loads. The indentation fracturetoughness was estimated by measuring the radial crack length from cube-cornerindentations at various loads and was 0.8 \pm 0.2 MPa.m1/2. The observed slipsystems of REBa2Cu3O(7-\delta) single crystals were [100](001) and [010](001),the same as for YBa2Cu3O(7-\delta) single crystals. The initial stages ofdeformation and fracture in the indentation process were investigated. Thehardness and elastic modulus were not strongly modified by the crystallographicorientation in the ab-plane. This was interpreted in terms of the resolvedshear stresses in the active slip systems. Evidence of cracking along the {100}and {110} planes on the ab-plane was observed. As a conclusion, the mechanicalproperties of REBa2Cu3O(7-\delta) single crystals prepared from xenotime areequivalent to those of YBa2Cu3O(7-\delta) single crystals produced byconventional rare earths oxides.

Depth-Sensing Indentation on REBa2Cu3O(7-\delta) Single Crystals obtained from Xenotime Mineral