A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y)
This study examines two pegmatitic monazite samples (2a and 4b, these numbers are related to a previous study) to determine their crystal chemistry and effects of internal radiation damage using synchrotron high-resolution powder X-ray diffraction and electron-probe micro-analysis. Both the huttonit...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/1/16 |
| _version_ | 1797543537048289280 |
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| author | M. Mashrur Zaman Sytle M. Antao |
| author_facet | M. Mashrur Zaman Sytle M. Antao |
| author_sort | M. Mashrur Zaman |
| collection | DOAJ |
| description | This study examines two pegmatitic monazite samples (2a and 4b, these numbers are related to a previous study) to determine their crystal chemistry and effects of internal radiation damage using synchrotron high-resolution powder X-ray diffraction and electron-probe micro-analysis. Both the huttonite and cheralite substitutions are discussed. Rietveld structure refinement of sample 2a shows three different phases [2a = monazite-(Ce), 2b = monazite-(Ce), and 2c = xenotime-(Y)] with distinct structural parameters. The changes among the unit-cell parameters between the two monazite-(Ce) phases is more pronounced in the <i>a</i> followed by the <i>b</i> and <i>c</i> unit-cell parameters. Sample 4a is a single-phase monazite-(Sm) that contains 0.164 <i>apfu</i> Th. Phase 2c with space group <i>I</i>4<sub>1</sub><i>/amd</i> arises from redistribution of La, Ce, Pr, Nd, Sm, Gd, Dy, Si, and Y atoms from those in monazite (space group <i>P</i>2<sub>1</sub>/<i>n</i>). A possible cause for the phase transition from monazite-(Ce) to xenotime-(Y) is α-radiation events over a long geological time. However, other chemical processes cannot be ruled out as a cause for the transition. |
| first_indexed | 2024-03-10T13:47:01Z |
| format | Article |
| id | doaj.art-f9f2b7eee7114210824cca4e551c5f29 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T13:47:01Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-f9f2b7eee7114210824cca4e551c5f292023-11-21T02:34:39ZengMDPI AGMinerals2075-163X2020-12-011111610.3390/min11010016A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y)M. Mashrur Zaman0Sytle M. Antao1Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4, CanadaDepartment of Geoscience, University of Calgary, Calgary, AB T2N 1N4, CanadaThis study examines two pegmatitic monazite samples (2a and 4b, these numbers are related to a previous study) to determine their crystal chemistry and effects of internal radiation damage using synchrotron high-resolution powder X-ray diffraction and electron-probe micro-analysis. Both the huttonite and cheralite substitutions are discussed. Rietveld structure refinement of sample 2a shows three different phases [2a = monazite-(Ce), 2b = monazite-(Ce), and 2c = xenotime-(Y)] with distinct structural parameters. The changes among the unit-cell parameters between the two monazite-(Ce) phases is more pronounced in the <i>a</i> followed by the <i>b</i> and <i>c</i> unit-cell parameters. Sample 4a is a single-phase monazite-(Sm) that contains 0.164 <i>apfu</i> Th. Phase 2c with space group <i>I</i>4<sub>1</sub><i>/amd</i> arises from redistribution of La, Ce, Pr, Nd, Sm, Gd, Dy, Si, and Y atoms from those in monazite (space group <i>P</i>2<sub>1</sub>/<i>n</i>). A possible cause for the phase transition from monazite-(Ce) to xenotime-(Y) is α-radiation events over a long geological time. However, other chemical processes cannot be ruled out as a cause for the transition.https://www.mdpi.com/2075-163X/11/1/16monazitexenotimeradiation damageRietveld refinementscrystal structurestructural variations |
| spellingShingle | M. Mashrur Zaman Sytle M. Antao A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) Minerals monazite xenotime radiation damage Rietveld refinements crystal structure structural variations |
| title | A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) |
| title_full | A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) |
| title_fullStr | A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) |
| title_full_unstemmed | A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) |
| title_short | A Possible Radiation-Induced Transition from Monazite-(Ce) to Xenotime-(Y) |
| title_sort | possible radiation induced transition from monazite ce to xenotime y |
| topic | monazite xenotime radiation damage Rietveld refinements crystal structure structural variations |
| url | https://www.mdpi.com/2075-163X/11/1/16 |
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