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Mechanical properties of rare earth stannate pyrochlores
The RE 2 Sn 2 O 7 series compounds (RE=La, Nb, Sm, Gd, Er, Yb) with a pyrochlore structure are prepared by co-precipitation method. The bulk, shear, Young's moduli, B/G, and Poisson's ratios are calculated using density functional theory and also measured by ultrasonic resonance method. Th...
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| Published in: | Applied physics letters 2011-11, Vol.99 (20), p.201909-201909-3 |
|---|---|
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | The RE
2
Sn
2
O
7
series compounds (RE=La, Nb, Sm, Gd, Er, Yb) with a pyrochlore structure are prepared by co-precipitation method. The bulk, shear, Young's moduli, B/G, and Poisson's ratios are calculated using density functional theory and also measured by ultrasonic resonance method. The theoretical values of lattice constants and mechanical moduli are smaller than experimental results. The electronic structures of RE
2
Sn
2
O
7
are analogous to RE
2
Zr
2
O
7
. La
2
Sn
2
O
7
exhibits stronger ionic bonds than others. The covalent interactions are slightly enhanced in the heavy rare earth stannate pyrochlores. The Vickers harnesses of RE
2
Sn
2
O
7
are measured experimentally, which are smaller than theoretical predictions. |
|---|---|
| ISSN: | 0003-6951 1077-3118 |
| DOI: | 10.1063/1.3659482 |