EXAFS studies of rare-earth metaphosphate glasses
An extended x-ray-absorption fine structure (EXAFS) study has been carried out on a range of rare-earth metaphosphate R(PO3)3 glasses of growing interest in optical communications and laser technologies. Phosphate glasses modified using the rare-earth oxides Pr6O11, Nd2O3, Eu2O3, Gd2O3, Tb2O3, and H...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
1996
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| Online Access: | http://psasir.upm.edu.my/id/eprint/40233/1/EXAFS%20studies%20of%20rare-earth%20metaphosphate%20glasses.pdf |
| _version_ | 1825949562334871552 |
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| author | Bowron, Daniel T. Saunders, George A. Newport, Robert J. Rainford, Brian D. Senin, H. B. |
| author_facet | Bowron, Daniel T. Saunders, George A. Newport, Robert J. Rainford, Brian D. Senin, H. B. |
| author_sort | Bowron, Daniel T. |
| collection | UPM |
| description | An extended x-ray-absorption fine structure (EXAFS) study has been carried out on a range of rare-earth metaphosphate R(PO3)3 glasses of growing interest in optical communications and laser technologies. Phosphate glasses modified using the rare-earth oxides Pr6O11, Nd2O3, Eu2O3, Gd2O3, Tb2O3, and Ho2O3, have been investigated using their respective rare-earth LIII absorption edges. The data provide information on the local environment of the rare-earth ion within the phosphate glass matrix constructed from linked PO4 tetrahedra. The rare-earth ions occupy sites with an average coordination number in the range, 6≤N≤8, the surrounding atoms being oxygen. The first shell interatomic distance over the range of rare-earth ions establishes the rare-earth contraction of ionic radii with increasing atomic number in a series of glasses. There is also evidence for a rare-earth-phosphorus correlation between 2.7 and 3.6 Å, and a further rare-earth-oxygen correlation at approximately 4 Å. The EXAFS spectrum shows no evidence for R-R correlations within the short-range order, a result especially pertinent to the optical and magnetic properties of the glasses. The fractal dimensionality 4C11/B of these glasses, obtained from the elastic stiffnesses determined from ultrasonic wave velocities, ranges between 2.3 and 2.8, indicating that their connectivity tends towards having a three-dimensional character. |
| first_indexed | 2024-03-06T08:46:28Z |
| format | Article |
| id | upm.eprints-40233 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T08:46:28Z |
| publishDate | 1996 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | upm.eprints-402332015-09-14T06:47:20Z http://psasir.upm.edu.my/id/eprint/40233/ EXAFS studies of rare-earth metaphosphate glasses Bowron, Daniel T. Saunders, George A. Newport, Robert J. Rainford, Brian D. Senin, H. B. An extended x-ray-absorption fine structure (EXAFS) study has been carried out on a range of rare-earth metaphosphate R(PO3)3 glasses of growing interest in optical communications and laser technologies. Phosphate glasses modified using the rare-earth oxides Pr6O11, Nd2O3, Eu2O3, Gd2O3, Tb2O3, and Ho2O3, have been investigated using their respective rare-earth LIII absorption edges. The data provide information on the local environment of the rare-earth ion within the phosphate glass matrix constructed from linked PO4 tetrahedra. The rare-earth ions occupy sites with an average coordination number in the range, 6≤N≤8, the surrounding atoms being oxygen. The first shell interatomic distance over the range of rare-earth ions establishes the rare-earth contraction of ionic radii with increasing atomic number in a series of glasses. There is also evidence for a rare-earth-phosphorus correlation between 2.7 and 3.6 Å, and a further rare-earth-oxygen correlation at approximately 4 Å. The EXAFS spectrum shows no evidence for R-R correlations within the short-range order, a result especially pertinent to the optical and magnetic properties of the glasses. The fractal dimensionality 4C11/B of these glasses, obtained from the elastic stiffnesses determined from ultrasonic wave velocities, ranges between 2.3 and 2.8, indicating that their connectivity tends towards having a three-dimensional character. American Physical Society 1996-03 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/40233/1/EXAFS%20studies%20of%20rare-earth%20metaphosphate%20glasses.pdf Bowron, Daniel T. and Saunders, George A. and Newport, Robert J. and Rainford, Brian D. and Senin, H. B. (1996) EXAFS studies of rare-earth metaphosphate glasses. Physical Review B: Condensed Matter and Materials Physics, 53 (9). pp. 5268-5275. ISSN 1098-0121; ESSN: 1538-4489 http://journals.aps.org/prb/abstract/10.1103/PhysRevB.53.5268 10.1103/PhysRevB.53.5268 |
| spellingShingle | Bowron, Daniel T. Saunders, George A. Newport, Robert J. Rainford, Brian D. Senin, H. B. EXAFS studies of rare-earth metaphosphate glasses |
| title | EXAFS studies of rare-earth metaphosphate glasses |
| title_full | EXAFS studies of rare-earth metaphosphate glasses |
| title_fullStr | EXAFS studies of rare-earth metaphosphate glasses |
| title_full_unstemmed | EXAFS studies of rare-earth metaphosphate glasses |
| title_short | EXAFS studies of rare-earth metaphosphate glasses |
| title_sort | exafs studies of rare earth metaphosphate glasses |
| url | http://psasir.upm.edu.my/id/eprint/40233/1/EXAFS%20studies%20of%20rare-earth%20metaphosphate%20glasses.pdf |
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