Lattice dynamics of fluoride scheelites: I. Raman and infrared study of LiYF4 and LiLnF4 (Ln = Ho, Er, Tm and Yb)
Identifieur interne : 002B01 ( Main/Exploration ); précédent : 002B00; suivant : 002B02Lattice dynamics of fluoride scheelites: I. Raman and infrared study of LiYF4 and LiLnF4 (Ln = Ho, Er, Tm and Yb)
Auteurs : S. Salaün [France] ; M. T. Fornoni [France] ; A. Bulou [France] ; M. Rousseau [France] ; P. Simon [France] ; J. Y. Gesland [France]Source :
- Journal of physics. Condensed matter [ 0953-8984 ] ; 1997.
Descripteurs français
- Pascal (Inist)
- Mode phonon, Dynamique réticulaire, Spectre Raman, Spectre IR, Spectre réflexion, Polarisation, Structure scheelite, Interaction électron phonon, Champ cristallin, Décomposition niveau énergie, Charge effective, Lithium fluorure, Yttrium fluorure, Holmium fluorure, Erbium fluorure, Thulium fluorure, Ytterbium fluorure, LiErF4, Er F Li, LiTmF4, F Li Tm, 6320D, LiYbF4, F Li Yb, Composé ternaire, Etude expérimentale, LiYF4, F Li Y, LiHoF4, F Ho Li.
English descriptors
- KwdEn :
- Crystal field, Effective charge, Electron phonon interaction, Energy-level splitting, Erbium fluorides, Experimental study, Holmium fluorides, Infrared spectra, Lattice dynamics, Lithium fluorides, Phonon mode, Polarization, Raman spectra, Reflection spectrum, Scheelite structure, Ternary compounds, Thulium fluorides, Ytterbium fluorides, Yttrium fluorides.
Abstract
IR and Raman active modes have been measured in several fluoride scheelites, namely the laser matrix LiYF4 (studied as a reference) and four LiLnF4 compounds (Ln = Ho, Er, Tm and Yb). The observed phonons have been assigned in accordance with the various irreducible representations of the point group of the crystal. In LiYF4 three modes never observed before have been measured. The polarized experimental IR reflection spectra have been analysed through a 'four-parameters' model to give the mode frequencies and dampings. For the whole set of the compounds, the frequency dependence of the dielectric function, optical indices and absorption coefficient have been deduced from the IR study. The electronic Raman effect has been shown in the low-temperature Raman spectra for Ln = Tm, Ho and Yb. The corresponding measured wavenumbers are compared with the calculated energies between crystal-field levels of LSJ states, each being associated to an irreducible representation of the ion-site group S4.
Affiliations:
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Simon</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>CRPHT, CNRS-1D, Avenue de la Recherche Scientifique</s1><s2>45071 Orléans</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>45071 Orléans</wicri:noRegion><wicri:noRegion>Avenue de la Recherche Scientifique</wicri:noRegion><wicri:noRegion>45071 Orléans</wicri:noRegion></affiliation></author><author><name sortKey="Gesland, J Y" sort="Gesland, J Y" uniqKey="Gesland J" first="J. Y." last="Gesland">J. Y. Gesland</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>72017 Le Mans</wicri:noRegion><wicri:noRegion>Avenue O Messiaen</wicri:noRegion><wicri:noRegion>72017 Le Mans</wicri:noRegion><orgName type="university">Université du Maine</orgName><placeName><settlement type="city">Le Mans</settlement><region type="region" nuts="2">Pays de la Loire</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">97-0435689</idno><date when="1997">1997</date><idno type="stanalyst">PASCAL 97-0435689 INIST</idno><idno type="RBID">Pascal:97-0435689</idno><idno type="wicri:Area/Pascal/Corpus">001359</idno><idno type="wicri:Area/Pascal/Curation">001359</idno><idno type="wicri:Area/Pascal/Checkpoint">001327</idno><idno type="wicri:explorRef" wicri:stream="Pascal" wicri:step="Checkpoint">001327</idno><idno type="wicri:doubleKey">0953-8984:1997:Salaun S:lattice:dynamics:of</idno><idno type="wicri:Area/Main/Merge">002C99</idno><idno type="wicri:Area/Main/Curation">002B01</idno><idno type="wicri:Area/Main/Exploration">002B01</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Lattice dynamics of fluoride scheelites: I. Raman and infrared study of LiYF<sub>4</sub> and LiLnF<sub>4</sub> (Ln = Ho, Er, Tm and Yb)</title><author><name sortKey="Salaun, S" sort="Salaun, S" uniqKey="Salaun S" first="S." last="Salaün">S. Salaün</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Pays de la Loire</region><settlement type="city">Le Mans</settlement><settlement type="city">Le Mans</settlement></placeName><orgName type="university">Université du Maine</orgName></affiliation></author><author><name sortKey="Fornoni, M T" sort="Fornoni, M T" uniqKey="Fornoni M" first="M. T." last="Fornoni">M. T. Fornoni</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>72017 Le Mans</wicri:noRegion><wicri:noRegion>Avenue O Messiaen</wicri:noRegion><wicri:noRegion>72017 Le Mans</wicri:noRegion><orgName type="university">Université du Maine</orgName><placeName><settlement type="city">Le Mans</settlement><region type="region" nuts="2">Pays de la Loire</region></placeName></affiliation></author><author><name sortKey="Bulou, A" sort="Bulou, A" uniqKey="Bulou A" first="A." last="Bulou">A. Bulou</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>72017 Le Mans</wicri:noRegion><wicri:noRegion>Avenue O Messiaen</wicri:noRegion><wicri:noRegion>72017 Le Mans</wicri:noRegion><orgName type="university">Université du Maine</orgName><placeName><settlement type="city">Le Mans</settlement><region type="region" nuts="2">Pays de la Loire</region></placeName></affiliation></author><author><name sortKey="Rousseau, M" sort="Rousseau, M" uniqKey="Rousseau M" first="M." last="Rousseau">M. Rousseau</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>72017 Le Mans</wicri:noRegion><wicri:noRegion>Avenue O Messiaen</wicri:noRegion><wicri:noRegion>72017 Le Mans</wicri:noRegion><orgName type="university">Université du Maine</orgName><placeName><settlement type="city">Le Mans</settlement><region type="region" nuts="2">Pays de la Loire</region></placeName></affiliation></author><author><name sortKey="Simon, P" sort="Simon, P" uniqKey="Simon P" first="P." last="Simon">P. Simon</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>CRPHT, CNRS-1D, Avenue de la Recherche Scientifique</s1><s2>45071 Orléans</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>45071 Orléans</wicri:noRegion><wicri:noRegion>Avenue de la Recherche Scientifique</wicri:noRegion><wicri:noRegion>45071 Orléans</wicri:noRegion></affiliation></author><author><name sortKey="Gesland, J Y" sort="Gesland, J Y" uniqKey="Gesland J" first="J. Y." last="Gesland">J. Y. Gesland</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratoire de Physique de l'Etat Condensé, Faculté des Sciences, Université du Maine, Avenue O Messiaen</s1><s2>72017 Le Mans</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>72017 Le Mans</wicri:noRegion><wicri:noRegion>Avenue O Messiaen</wicri:noRegion><wicri:noRegion>72017 Le Mans</wicri:noRegion><orgName type="university">Université du Maine</orgName><placeName><settlement type="city">Le Mans</settlement><region type="region" nuts="2">Pays de la Loire</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of physics. Condensed matter</title><title level="j" type="abbreviated">J. phys., Condens. matter</title><idno type="ISSN">0953-8984</idno><imprint><date when="1997">1997</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of physics. Condensed matter</title><title level="j" type="abbreviated">J. phys., Condens. matter</title><idno type="ISSN">0953-8984</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Crystal field</term><term>Effective charge</term><term>Electron phonon interaction</term><term>Energy-level splitting</term><term>Erbium fluorides</term><term>Experimental study</term><term>Holmium fluorides</term><term>Infrared spectra</term><term>Lattice dynamics</term><term>Lithium fluorides</term><term>Phonon mode</term><term>Polarization</term><term>Raman spectra</term><term>Reflection spectrum</term><term>Scheelite structure</term><term>Ternary compounds</term><term>Thulium fluorides</term><term>Ytterbium fluorides</term><term>Yttrium fluorides</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Mode phonon</term><term>Dynamique réticulaire</term><term>Spectre Raman</term><term>Spectre IR</term><term>Spectre réflexion</term><term>Polarisation</term><term>Structure scheelite</term><term>Interaction électron phonon</term><term>Champ cristallin</term><term>Décomposition niveau énergie</term><term>Charge effective</term><term>Lithium fluorure</term><term>Yttrium fluorure</term><term>Holmium fluorure</term><term>Erbium fluorure</term><term>Thulium fluorure</term><term>Ytterbium fluorure</term><term>LiErF4</term><term>Er F Li</term><term>LiTmF4</term><term>F Li Tm</term><term>6320D</term><term>LiYbF4</term><term>F Li Yb</term><term>Composé ternaire</term><term>Etude expérimentale</term><term>LiYF4</term><term>F Li Y</term><term>LiHoF4</term><term>F Ho Li</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">IR and Raman active modes have been measured in several fluoride scheelites, namely the laser matrix LiYF<sub>4</sub> (studied as a reference) and four LiLnF<sub>4</sub> compounds (Ln = Ho, Er, Tm and Yb). The observed phonons have been assigned in accordance with the various irreducible representations of the point group of the crystal. In LiYF<sub>4</sub> three modes never observed before have been measured. The polarized experimental IR reflection spectra have been analysed through a 'four-parameters' model to give the mode frequencies and dampings. For the whole set of the compounds, the frequency dependence of the dielectric function, optical indices and absorption coefficient have been deduced from the IR study. The electronic Raman effect has been shown in the low-temperature Raman spectra for Ln = Tm, Ho and Yb. The corresponding measured wavenumbers are compared with the calculated energies between crystal-field levels of LSJ states, each being associated to an irreducible representation of the ion-site group S<sub>4</sub>.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Pays de la Loire</li></region><settlement><li>Le Mans</li></settlement><orgName><li>Université du Maine</li></orgName></list><tree><country name="France"><region name="Pays de la Loire"><name sortKey="Salaun, S" sort="Salaun, S" uniqKey="Salaun S" first="S." last="Salaün">S. Salaün</name></region><name sortKey="Bulou, A" sort="Bulou, A" uniqKey="Bulou A" first="A." last="Bulou">A. Bulou</name><name sortKey="Fornoni, M T" sort="Fornoni, M T" uniqKey="Fornoni M" first="M. T." last="Fornoni">M. T. Fornoni</name><name sortKey="Gesland, J Y" sort="Gesland, J Y" uniqKey="Gesland J" first="J. Y." last="Gesland">J. Y. Gesland</name><name sortKey="Rousseau, M" sort="Rousseau, M" uniqKey="Rousseau M" first="M." last="Rousseau">M. Rousseau</name><name sortKey="Simon, P" sort="Simon, P" uniqKey="Simon P" first="P." last="Simon">P. Simon</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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