NDLI: Depth-Sensing Indentation on REBa$_{2}$Cu$_{3}$O$_{7−δ}$ Single Crystals Obtained from Xenotime Mineral

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Brazilian Journal of Physics : Volume 42, Issue 3-4, August 2012

Brazilian Journal of Physics : Volume 42, Issue 1-2, April 2012

Brazilian Journal of Physics : Volume 41

Depth-Sensing Indentation on REBa$_{2}$Cu$_{3}$O$_{7−δ}$ Single Crystals Obtained from Xenotime Mineral

Content Provider	Springer Nature Link
Author	Serbena, Francisco Carlos Foerster, Carlos Eugênio Jurelo, Alcione Roberto Mikowski, Alexandre Júnior, Pedro Rodrigues Carubelli, Célia Regina Lepienski, Carlos Maurício
Copyright Year	2012
Abstract	A natural mixture of heavy rare-earth oxides extracted from xenotime mineral have been used to prepare large single crystals of the high-temperature REBa$_{2}$Cu$_{3}$O$_{7−δ}$ superconductor, grown using the CuO–BaO self-flux method. Its mechanical properties along the ab-plane were characterized using instrumented indentation. Hardness and elastic moduli were measured by the Oliver and Pharr method, which yielded 7.4 ± 0.2 GPa and the range 135–175 GPa at small depths, respectively. Increased loads promote the nucleation of lateral cracks, which reduce hardness and measured elastic modulus, as indicated by instrumented indentation at higher loads. The indentation fracture toughness, estimated by measuring the radial crack length from cube corner indentations at various loads, was found to be 0.8 ± 0.2 MPa m$^{1/2}$. The observed slip systems of REBa$_{2}$Cu$_{3}$O$_{7−δ}$ single crystals were [100](001) and [010](001), the same as for YBa$_{2}$Cu$_{3}$O$_{7−δ}$ single crystals. The initial stages of deformation and fracture in the indentation process were investigated. The hardness and elastic modulus are not strongly modified by the crystallographic orientation in the ab-plane. This was interpreted in terms of resolved shear stresses in the active slip systems. Evidence of cracking along the {100} and {110} planes on the ab-plane was observed. In conclusion, the mechanical properties of REBa$_{2}$Cu$_{3}$O$_{7−δ}$ single crystals prepared from xenotime are equivalent to those of YBa$_{2}$Cu$_{3}$O$_{7−δ}$ single crystals from conventional rare-earth oxides.
Starting Page	330
Ending Page	339
Page Count	10
File Format	PDF
ISSN	01039733
Journal	Brazilian Journal of Physics
Volume Number	42
Issue Number	5-6
e-ISSN	16784448
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-10
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	High-temperature superconductors Single crystal Xenotime Mechanical properties Physics
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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Depth-Sensing Indentation on REBa2Cu3O7−δ Single Crystals Obtained from Xenotime Mineral (2011)

Mechanical Properties of $hbox{REBa}_{2}hbox{Cu}_{3} hbox{O}_{7 - delta}$ Superconductor With RE Obtained From Xenotime Mineral

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Depth-Sensing Indentation on REBa$_{2}$Cu$_{3}$O$_{7−δ}$ Single Crystals Obtained from Xenotime Mineral

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Depth-Sensing Indentation on REBa$_{2}$Cu$_{3}$O$_{7−δ}$ Single Crystals Obtained from Xenotime Mineral