Displacive radiation effects in the monazite- and zircon-structure orthophosphates
Identifieur interne : 002878 ( Main/Exploration ); précédent : 002877; suivant : 002879Displacive radiation effects in the monazite- and zircon-structure orthophosphates
Auteurs : A. Meldrum [États-Unis] ; L. A. Boatner ; R. C. Ewing [États-Unis]Source :
- Physical review. B, Condensed matter [ 0163-1829 ] ; 1997-12-01.
Descripteurs français
- Pascal (Inist)
- 6180, Etude expérimentale, Phosphate, Zirconate, Zircon, Monazite, Minéral phosphate, Lanthane composé, Effet physique rayonnement, Krypton ion, Domaine énergie 100-1000 keV, Diffraction électron, Praséodyme composé, Néodyme composé, Samarium composé, Europium composé, Gadolinium composé, Scandium composé, Yttrium alliage, Terbium composé, Thulium composé, Ytterbium composé, Lutétium composé, Effet faisceau ion, Amorphisation, Transformation déplacement, Perte énergie particule.
- Wicri :
- topic : Phosphate.
English descriptors
- KwdEn :
- Amorphization, Displacive transformations, Electron diffraction, Energy loss of particles, Europium compounds, Experimental study, Gadolinium compounds, Ion beam effects, Krypton ions, Lanthanum compounds, Lutetium compounds, Monazites, Neodymium compounds, Phosphate minerals, Phosphates, Physical radiation effects, Praseodymium compounds, Samarium compounds, Scandium compounds, Terbium compounds, Thulium compounds, Ytterbium compounds, Yttrium alloys, Zircon, Zirconates, keV range 100-1000.
Abstract
Monazite-structure orthophosphates, including LaPO4, PrPO4, NdPO4, SmPO4, EuPO4, GdPO4, and natural monazite, and their zircon-structure analogs, including ScPO4, YPO4, TbPO4, TmPO4, YbPO4, and LuPO4, were irradiated by 800 keV Kr2+ ions in the temperature range of 20 to 600 K. The critical amorphization dose was determined in situ as a function of temperature using selected-area electron diffraction. Amorphization doses were in the range of 1014 to 1016 ions/cm2, depending on the temperature. Materials with the zircon structure were amorphized at higher temperatures than those with the monazite structure. The critical amorphization temperature ranged from 350 to 485 K for orthophosphates with the monazite structure and from 480 to 580 K for those with the zircon structure. However, natural zircon (ZrSiO4) can be amorphized at over 1000 K. Within each structure type, the critical temperature of amorphization increased with the atomic number of the lanthanide cation. Structural topology models are consistent with the observed differences between the two structure types, but do not predict the relative amorphization doses for different compositions. The ratio of electronic-to-nuclear stopping correlates well with the observed sequence of susceptibility to amorphization within each structure type, consistent with previous results that electronic-energy losses enhance defect recombination in the orthophosphates.
Affiliations:
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Le document en format XML
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amorphization</term>
<term>Displacive transformations</term>
<term>Electron diffraction</term>
<term>Energy loss of particles</term>
<term>Europium compounds</term>
<term>Experimental study</term>
<term>Gadolinium compounds</term>
<term>Ion beam effects</term>
<term>Krypton ions</term>
<term>Lanthanum compounds</term>
<term>Lutetium compounds</term>
<term>Monazites</term>
<term>Neodymium compounds</term>
<term>Phosphate minerals</term>
<term>Phosphates</term>
<term>Physical radiation effects</term>
<term>Praseodymium compounds</term>
<term>Samarium compounds</term>
<term>Scandium compounds</term>
<term>Terbium compounds</term>
<term>Thulium compounds</term>
<term>Ytterbium compounds</term>
<term>Yttrium alloys</term>
<term>Zircon</term>
<term>Zirconates</term>
<term>keV range 100-1000</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>6180</term>
<term>Etude expérimentale</term>
<term>Phosphate</term>
<term>Zirconate</term>
<term>Zircon</term>
<term>Monazite</term>
<term>Minéral phosphate</term>
<term>Lanthane composé</term>
<term>Effet physique rayonnement</term>
<term>Krypton ion</term>
<term>Domaine énergie 100-1000 keV</term>
<term>Diffraction électron</term>
<term>Praséodyme composé</term>
<term>Néodyme composé</term>
<term>Samarium composé</term>
<term>Europium composé</term>
<term>Gadolinium composé</term>
<term>Scandium composé</term>
<term>Yttrium alliage</term>
<term>Terbium composé</term>
<term>Thulium composé</term>
<term>Ytterbium composé</term>
<term>Lutétium composé</term>
<term>Effet faisceau ion</term>
<term>Amorphisation</term>
<term>Transformation déplacement</term>
<term>Perte énergie particule</term>
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<front><div type="abstract" xml:lang="en">Monazite-structure orthophosphates, including LaPO<sub>4</sub>
, PrPO<sub>4</sub>
, NdPO<sub>4</sub>
, SmPO<sub>4</sub>
, EuPO<sub>4</sub>
, GdPO<sub>4</sub>
, and natural monazite, and their zircon-structure analogs, including ScPO<sub>4</sub>
, YPO<sub>4</sub>
, TbPO<sub>4</sub>
, TmPO<sub>4</sub>
, YbPO<sub>4</sub>
, and LuPO<sub>4</sub>
, were irradiated by 800 keV Kr<sup>2+</sup>
ions in the temperature range of 20 to 600 K. The critical amorphization dose was determined in situ as a function of temperature using selected-area electron diffraction. Amorphization doses were in the range of 10<sup>14</sup>
to 10<sup>16</sup>
ions/cm<sup>2</sup>
, depending on the temperature. Materials with the zircon structure were amorphized at higher temperatures than those with the monazite structure. The critical amorphization temperature ranged from 350 to 485 K for orthophosphates with the monazite structure and from 480 to 580 K for those with the zircon structure. However, natural zircon (ZrSiO<sub>4</sub>
) can be amorphized at over 1000 K. Within each structure type, the critical temperature of amorphization increased with the atomic number of the lanthanide cation. Structural topology models are consistent with the observed differences between the two structure types, but do not predict the relative amorphization doses for different compositions. The ratio of electronic-to-nuclear stopping correlates well with the observed sequence of susceptibility to amorphization within each structure type, consistent with previous results that electronic-energy losses enhance defect recombination in the orthophosphates.</div>
</front>
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<country name="États-Unis"><region name="Nouveau-Mexique"><name sortKey="Meldrum, A" sort="Meldrum, A" uniqKey="Meldrum A" first="A." last="Meldrum">A. Meldrum</name>
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