Composition, lattice parameters, and room temperature elastic constants of natural single crystal xenotime from Novo Horizonte |
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| Authors: | P Mogilevsky E B Zaretsky T A Parthasarathy F Meisenkothen |
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| Institution: | (1) UES Inc., 4401 Dayton-Xenia Rd., Dayton, OH 45432, USA;(2) Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer-Sheva, 84105, Israel |
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| Abstract: | The composition, lattice parameters, and elastic constants of natural single crystal YPO4 xenotime from Novo Horizonte (Brazil) were determined using EPMA, XRD, and the pulse-echo technique. The composition indicates a 24% substitution of Y sites with other rare-earth elements. The lattice parameters of the studied crystal deviated only slightly from those reported for synthetic YPO4 and were in a good agreement with trends obeyed by other orthophosphates with the xenotime structure. The measured elastic constants C
11, C
33, C
44, and C
66 were consistent with synthetic crystals when porosity was accounted for. C
12 and C
13 constants were evaluated based on the comparison with other materials with xenotime structure. The elastic constants could be rationalized using interionic force constants and bond energies. |
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| Keywords: | Elastic constants Composition Lattice parameters Fiber reinforced CMCs |
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