CobaltMaghrebV1, Maroc, Analysis, bibRecord, 000065

Raman study of LiTaO3-related non-stoichiometric solid solutions isolated inside the ternary systems Li2O-Ta2O5-(M'O)2 with M' = Mn, Co

Identifieur interne : 000065 ( Maroc/Analysis ); précédent : 000064; suivant : 000066

Raman study of LiTaO3-related non-stoichiometric solid solutions isolated inside the ternary systems Li2O-Ta2O5-(M'O)2 with M' = Mn, Co

Auteurs : A. Assani [Maroc] ; El. M. Lotfi [Maroc] ; P. Bourson [France] ; M. Aillerie [France] ; B. Lahbabi [Maroc] ; M. Zriouil [Maroc] ; B. Elouadi [France]

Source :

The Journal of physics and chemistry of solids [ 0022-3697 ] ; 2009.

RBID : Pascal:09-0307143

Descripteurs français

Pascal (Inist)
- Addition manganèse, Spectre Raman, Addition cobalt, Mode phonon, Diagramme phase, Substitution ion, Site impureté, Mode vibration, Dopage, Concentration impureté, Compensation charge, Tantalate de lithium.
Wicri :
- topic : Dopage.

English descriptors

KwdEn :
- Charge compensation, Cobalt additions, Doping, Impurity density, Impurity site, Ion substitution, Lithium tantalates, Manganese additions, Phase diagrams, Phonon mode, Raman spectra, Vibrational modes.

Abstract

We have characterized by Raman spectroscopy the disorder and the local modifications of cation environment in the lithium tantalate structure resulting from the incorporation of bivalent cations Co²⁺ and Mn²⁺ as potential substitutes for Li and/or Ta ions. Frequency and damping of the E(TO1), E(T06) and E(TO8) phonon modes of ceramic powders are studied along seven lines in the ternary phase diagrams Li₂O-Ta₂O₅-(M'O)₂ with M' = Mn and Co, and compared to those of the pure stoichiometric LiTaO₃. Raman spectroscopy is found to be very sensitive to the substitution ions and defects generated in the lattice vibration. Dopants occupy primarily the Li site in the region of lithium oxide excess. The site of Ta becomes progressively implicated in the substitution process when the concentration of dopant increases. In the Li-poor region of the ternary-phase diagram, corresponding to under- stoichiometric compositions, we retain the charge compensation mechanism involving both Li and Ta site according to: 3Li⁺+Ta⁵⁺→4M'²⁺ with M'²⁺ = Mn²⁺ or Co²⁺.

Affiliations:

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Pascal:09-0307143

Le document en format XML

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-related non-stoichiometric solid solutions isolated inside the ternary systems Li<sub>2</sub>
O-Ta<sub>2</sub>
O<sub>5</sub>
-(M'O)<sub>2</sub>
 with M' = Mn, Co</title>
<author><name sortKey="Assani, A" sort="Assani, A" uniqKey="Assani A" first="A." last="Assani">A. Assani</name>
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<author><name sortKey="Elouadi, B" sort="Elouadi, B" uniqKey="Elouadi B" first="B." last="Elouadi">B. Elouadi</name>
<affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Laboratoire d'Elaboration Analyse Chimique et Ingénierie des Matériaux, Université de La Rochelle, Avenue Michel Crépeau</s1>
<s2>17042 La Rochelle</s2>
<s3>FRA</s3>
<sZ>7 aut.</sZ>
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<country>France</country>
<placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region>
<region type="old region" nuts="2">Poitou-Charentes</region>
<settlement type="city">La Rochelle</settlement>
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<orgName type="university">Université de La Rochelle</orgName>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Raman study of LiTaO<sub>3</sub>
-related non-stoichiometric solid solutions isolated inside the ternary systems Li<sub>2</sub>
O-Ta<sub>2</sub>
O<sub>5</sub>
-(M'O)<sub>2</sub>
 with M' = Mn, Co</title>
<author><name sortKey="Assani, A" sort="Assani, A" uniqKey="Assani A" first="A." last="Assani">A. Assani</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Solide Appliquée, LAF no. 501 Département de Chimie, Faculté des Sciences, Avenue Ibn Battouta, BP 1014</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Lotfi, El M" sort="Lotfi, El M" uniqKey="Lotfi E" first="El. M." last="Lotfi">El. M. Lotfi</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Solide Appliquée, LAF no. 501 Département de Chimie, Faculté des Sciences, Avenue Ibn Battouta, BP 1014</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Département Génie Mécanique, ENSET, B.P.: 6207, Rabat Instituts</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>2 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Bourson, P" sort="Bourson, P" uniqKey="Bourson P" first="P." last="Bourson">P. Bourson</name>
<affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire Matériaux Optiques, Photonique et Systèmes, CNRS UMR 7132, Université Paul Verlaine de Metz-Supelec, 2 rue E. Belin</s1>
<s2>57070 Metz</s2>
<s3>FRA</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
<settlement type="city">Metz</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Aillerie, M" sort="Aillerie, M" uniqKey="Aillerie M" first="M." last="Aillerie">M. Aillerie</name>
<affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire Matériaux Optiques, Photonique et Systèmes, CNRS UMR 7132, Université Paul Verlaine de Metz-Supelec, 2 rue E. Belin</s1>
<s2>57070 Metz</s2>
<s3>FRA</s3>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
<settlement type="city">Metz</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Lahbabi, B" sort="Lahbabi, B" uniqKey="Lahbabi B" first="B." last="Lahbabi">B. Lahbabi</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Solide Appliquée, LAF no. 501 Département de Chimie, Faculté des Sciences, Avenue Ibn Battouta, BP 1014</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Zriouil, M" sort="Zriouil, M" uniqKey="Zriouil M" first="M." last="Zriouil">M. Zriouil</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Chimie du Solide Appliquée, LAF no. 501 Département de Chimie, Faculté des Sciences, Avenue Ibn Battouta, BP 1014</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Elouadi, B" sort="Elouadi, B" uniqKey="Elouadi B" first="B." last="Elouadi">B. Elouadi</name>
<affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Laboratoire d'Elaboration Analyse Chimique et Ingénierie des Matériaux, Université de La Rochelle, Avenue Michel Crépeau</s1>
<s2>17042 La Rochelle</s2>
<s3>FRA</s3>
<sZ>7 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region>
<region type="old region" nuts="2">Poitou-Charentes</region>
<settlement type="city">La Rochelle</settlement>
</placeName>
<orgName type="university">Université de La Rochelle</orgName>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">The Journal of physics and chemistry of solids</title>
<title level="j" type="abbreviated">J. phys. chem. solids</title>
<idno type="ISSN">0022-3697</idno>
<imprint><date when="2009">2009</date>
</imprint>
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<seriesStmt><title level="j" type="main">The Journal of physics and chemistry of solids</title>
<title level="j" type="abbreviated">J. phys. chem. solids</title>
<idno type="ISSN">0022-3697</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Charge compensation</term>
<term>Cobalt additions</term>
<term>Doping</term>
<term>Impurity density</term>
<term>Impurity site</term>
<term>Ion substitution</term>
<term>Lithium tantalates</term>
<term>Manganese additions</term>
<term>Phase diagrams</term>
<term>Phonon mode</term>
<term>Raman spectra</term>
<term>Vibrational modes</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Addition manganèse</term>
<term>Spectre Raman</term>
<term>Addition cobalt</term>
<term>Mode phonon</term>
<term>Diagramme phase</term>
<term>Substitution ion</term>
<term>Site impureté</term>
<term>Mode vibration</term>
<term>Dopage</term>
<term>Concentration impureté</term>
<term>Compensation charge</term>
<term>Tantalate de lithium</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Dopage</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We have characterized by Raman spectroscopy the disorder and the local modifications of cation environment in the lithium tantalate structure resulting from the incorporation of bivalent cations Co<sup>2+</sup>
 and Mn<sup>2+</sup>
 as potential substitutes for Li and/or Ta ions. Frequency and damping of the E(TO1), E(T06) and E(TO8) phonon modes of ceramic powders are studied along seven lines in the ternary phase diagrams Li<sub>2</sub>
O-Ta<sub>2</sub>
O<sub>5</sub>
-(M'O)<sub>2</sub>
 with M' = Mn and Co, and compared to those of the pure stoichiometric LiTaO<sub>3</sub>
. Raman spectroscopy is found to be very sensitive to the substitution ions and defects generated in the lattice vibration. Dopants occupy primarily the Li site in the region of lithium oxide excess. The site of Ta becomes progressively implicated in the substitution process when the concentration of dopant increases. In the Li-poor region of the ternary-phase diagram, corresponding to under- stoichiometric compositions, we retain the charge compensation mechanism involving both Li and Ta site according to: 3Li<sup>+</sup>
+Ta<sup>5+</sup>
→4M'<sup>2+</sup>
 with M'<sup>2+</sup>
 = Mn<sup>2+</sup>
 or Co<sup>2+</sup>
.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>Maroc</li>
</country>
<region><li>Grand Est</li>
<li>Lorraine (région)</li>
<li>Nouvelle-Aquitaine</li>
<li>Poitou-Charentes</li>
<li>Rabat-Salé-Kénitra</li>
</region>
<settlement><li>La Rochelle</li>
<li>Metz</li>
<li>Rabat</li>
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<orgName><li>Université de La Rochelle</li>
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</list>
<tree><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="Assani, A" sort="Assani, A" uniqKey="Assani A" first="A." last="Assani">A. Assani</name>
</region>
<name sortKey="Lahbabi, B" sort="Lahbabi, B" uniqKey="Lahbabi B" first="B." last="Lahbabi">B. Lahbabi</name>
<name sortKey="Lotfi, El M" sort="Lotfi, El M" uniqKey="Lotfi E" first="El. M." last="Lotfi">El. M. Lotfi</name>
<name sortKey="Lotfi, El M" sort="Lotfi, El M" uniqKey="Lotfi E" first="El. M." last="Lotfi">El. M. Lotfi</name>
<name sortKey="Zriouil, M" sort="Zriouil, M" uniqKey="Zriouil M" first="M." last="Zriouil">M. Zriouil</name>
</country>
<country name="France"><region name="Grand Est"><name sortKey="Bourson, P" sort="Bourson, P" uniqKey="Bourson P" first="P." last="Bourson">P. Bourson</name>
</region>
<name sortKey="Aillerie, M" sort="Aillerie, M" uniqKey="Aillerie M" first="M." last="Aillerie">M. Aillerie</name>
<name sortKey="Elouadi, B" sort="Elouadi, B" uniqKey="Elouadi B" first="B." last="Elouadi">B. Elouadi</name>
</country>
</tree>
</affiliations>
</record>

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Raman study of LiTaO3-related non-stoichiometric solid solutions isolated inside the ternary systems Li2O-Ta2O5-(M'O)2 with M' = Mn, Co

Raman study of LiTaO3-related non-stoichiometric solid solutions isolated inside the ternary systems Li2O-Ta2O5-(M'O)2 with M' = Mn, Co

Source :

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri