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Dissertations / Theses on the topic 'Fluorite structure'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

Brass, Andrew Michael. "Molecular dynamics simulations of fluorite structure crystals." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/12714.

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2

Lavers, Philip S. "The mobility of large anions in crystals with the fluorite structure." Access electronically, 2002. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20041101.165217/index.html.

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3

Webster, Nathan A. S. "New fluorite-type Bi2O3-based solid electrolytes : characterisation, conductivity and crystallography." University of Western Australia. School of Biomedical and Chemical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0092.

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[Truncated abstract] New, double-doped, Bi2O3-based materials in the Bi2O3 Ln2O3 PbO (Ln = La, Nd, Er and Yb) and Bi2O3 WO3 PbO systems were prepared using solid-state reactions. For the Bi2O3 Er2O3 PbO and Bi2O3 Yb2O3 PbO systems, the air-quenchable compositional domain of the fcc fluorite-type phase was partially established. Temperature dependent conductivity measurements were performed on these quenched-in fluorite-type materials using AC impedance spectroscopy. Conductivity at 750[degrees Celsius] generally increased with increasing Pb2+/Ln3+ and decreasing (Ln3++Pb2+)/Bi3+ ratios
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4

Jamison, Steven P. "Laser site-selective spectroscopy of rare-earth ions in crystals of the fluorite structure." Thesis, University of Canterbury. Physics, 1998. http://hdl.handle.net/10092/8172.

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Site-selective laser spectroscopy, Zeeman infrared and optical absorption have been employed to investigate trivalent dysprosium centers in rare-earth doped alkaline-earth fluoride crystals. These studies have characterised the two dominant centers in SrF₂:Dy³⁺ which are determined to be the fluorine compensated C₄ᵥ and C₃ᵥ centers analogous to those observed in other SrF₂:RE³⁺ systems. The C₃ᵥ center is shown to correspond to the J-center of Sr₁:Er³⁺, rather than the B-center reported for SrF₂:Ho³⁺. In CaF₂:Dy³⁺ three single Dy³⁺ ion centers have been characterised, corresponding to the C₄ᵥ ,
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5

Penkala, Bartosz. "Low Temperature Oxygen Mobility Applied to Catalysis." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS022.

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Accomplir les spécifications des nouvelles réglementations concernant les gaz d'échappement de post-traitement des technologies automobiles, par exemple, TWC, implique la disponibilité et l'utilisation de matériaux catalytiquement actifs et notamment des composés tampons d'oxygène, ce qui peut réversible stocker et libérer de grandes quantités de l'oxygène. Oxyde de cérium dopé présente encore aujourd'hui le seul composé de référence pour un support approprié, en raison de sa grande capacité de stockage de l'oxygène et possibilité de créer facilement des lacunes en ions d'oxygène. Cependant, p
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6

Monir, Md M. "A COMPUTATIONAL INVESTIGATION OF SECTORAL ZONING OF RARE EARTH ELEMENTS (REE) IN FLUORITE." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1438881165.

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7

Mitchell, Martin R. "Investigation of structure and disorder in inorganic solids using solid-state NMR." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3367.

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The use of solid-state NMR and DFT calculations to study Y₂Sn[subscript(x)]Ti[subscript(2-x)]O₇, Y₂Sn[subscript(x)]Zr[subscript(2-x)]O₇ and Y₂Ti[subscript(x)]Zr[subscript(2-x)]O₇, materials with applications for the safe encapsulation of radioactive actinides is investigated. As a result of cation or anion disorder in these materials, NMR spectra are often complex and difficult to interpret. Therefore, an investigation using a range of NMR active nuclei and measurement of a variety of NMR parameters (isotropic chemical shift, δ[subscript(iso)]; span, Ω and quadrupolar coupling, C[subscript(Q)]
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8

Bosze, Stephanie Lynn. "SURFACE STRUCTURALLY CONTROLLED SECTORAL ZONING IN FLUORITE: IMPLICATIONS TO UNDERSTANDING HETEROGENEOUS REACTIVITY AT THE MINERAL-WATER INTERFACE." Oxford, Ohio : Miami University, 2001. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami981052842.

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9

Godinho, Jose. "Dissolution of fluorite type surfaces as analogues of spent nuclear fuel : Production of suitable analogues and study the effect of surface orientation on dissolution." Licentiate thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-60289.

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It is accepted worldwide that the best final solution for spent nuclear fuel is to bury it in deep geological repositories. Despite the physical and chemical barriers that are supposed to isolate the nuclear waste for at least 100.000 years, some uncertainty factors may cause underground water to get in contact with the nuclear waste. Due to radioactivity and oxidation under air, dissolution experiments using UO2 pellets are difficult and frequently lead to incoherent results. Therefore, to enable a detailed study of the influence of microstructure and surface properties on the stability of sp
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10

Bostwick, Aaron A. "Impact on calcium fluoride reactivity and electronic structure of photon and electron stimulated fluorine desorption /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/9721.

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11

Evangelakis, Georgios A. "Superconducteurs ioniques de structure fluorine : A) mesure de la conductivité ionique du fluorure de strontium : B) étude des propriétés thermodynamiques du fluorure de calcium par simulation numérique." Nancy 1, 1989. http://www.theses.fr/1989NAN10311.

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Dans ce travail nous présentons les résultats d'une étude expérimentale de la conductivité ionique du fluorure de strontium, ainsi que ceux d'une investigation des propriétés thermodynamiques du fluorure de calcium dans le domaine de conduction superionique par simulation à l'aide de la dynamique moléculaire. Les mesures de la conductivité ionique du fluorure de strontium ont été effectuées à haute température (700-1350 K) en fonction de la fréquence du champ électrique utilisé (10 HZ-10 MHZ). Pour toutes les températures exploitées, nous avons trouvé une dépendance de la conductivité en fonct
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12

Firth, N. C. "Molecular beam reactive scattering of fluorine atoms." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377732.

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13

Abel, Jonathan. "Corrélations compositions chimiques-structures d’oxydes mixtes (Ce / Zr) à base de Pr4+ / Pr3+ et propriétés de réductibilité." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14334/document.

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Ce travail est relatif à la synthèse et à la caractérisation d’oxydes mixtes Pr1-zCezO2-y et Pr1-xZrxO2-y. Différentes compositions chimiques associées à une valence mixte Pr4+/Pr3+ concomitant à un taux précis de lacunes d’oxygènes ont été isolées tant pour les composés à l’état oxydé que pour ces derniers réduits sous Ar/H2. A l’état réduit, différentes surstructures de la maille fluorine ont été caractérisées par diffraction des RX et de neutrons. Sur la base de mesures magnétiques, d’analyses par spectroscopie d’absorption X (XANES-EXAFS) aux seuils K du Zr et LIII du Ce/Pr et d’analyses t
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14

Gimenez-Ibanez, Diana. "Exploring the applications of fluorine for peptoid structure induction." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12789/.

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Throughout this thesis we have sought to demonstrate the broad applicability of fluorine and fluorinated groups as tools to promote enhanced conformational preferences in α-peptoids. To this purpose, a range of new fluorinated peptoid monomers have been designed and synthetized, including non-bulky fluoro-alkyl, fluoroheteroaromatic, α-trifluoromethyl, perfluoro-(hetero)aryl and pentafluoro-sulfanylphenyl (NSF5Ph) based monomers. The effects that fluorine can impart on peptoid cis/trans amide bond preferences have been studied in simple model systems using both NMR and X-ray analysis. Through
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15

Alcock, Simon Graham. "The atomic structure of fluoride superlattices and antimonide surfaces." Thesis, University of Leicester, 2003. http://hdl.handle.net/2381/30667.

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The atomic structure of the CaF2-Si(111) interface and the repeated unit cell of MnF2-CaF2-Si(111) superlattices have been determined using surface x-ray diffraction. Specular reflectivity and non-specular rod scans were measured for a number of superlattice samples. All samples had a type-B interface. Ultra-thin layers of MnF2, below a critical thickness of 5 monolayers, adopted the fluorite structure of CaF2. These layers are likely to have different magnetic properties to bulk anti-ferromagnetic MnF2, possibly leading to novel magnetic applications. We have developed software to interface w
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16

Vidhate, Shailesh. "Piezoresistive Polyvinylidene Fluoride/Carbon Filled Nanocomposites." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc68059/.

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This thesis examines the value of using dispersed conductive fillers as a stress/strain sensing material. The effect of the intrinsic conductivity of the filler on the ability to be effective and the influence of filler concentration on the conductivity are also examined. To meet these objectives, nanocomposites of polyvinylidene fluoride (PVDF) with carbon nanofibers (CNFs) and carbon nanotubes (CNTs) were prepared by melt-blending using a twin screw extruder. Since PVDF has a potential to be piezoresistive based on the type of crystalline phase, the effect of CNFs on PVDF crystallinity, crys
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17

True, Marcus. "Fine structure in d - f and f - f transitions of Tm3+ and systematic investigation of 3d5-3d44s absorption of Mn2+ doped fluorides." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972809996.

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18

Peddie, Victoria. "β-Peptides: Influence of Fluorine on Structure, Conformation and Function". Thesis, University of Canterbury. Chemistry, 2010. http://hdl.handle.net/10092/4466.

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This thesis examines the synthesis of α-fluoro-β-amino acids, and the influence of the constituent fluorine on the conformation and biological properties of β-peptide derivatives. Chapter One discusses the unique properties of the C-F bond, and applications of fluorine substitution in organic and medicinal chemistry. This is followed by a review of fluorinated analogues of α-amino acids, and how their incorporation into α-peptides has resulted in profound modifications, such as enhanced thermal and chemical stability, increased affinity for lipid bilayers, stronger self-association and impro
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19

Reisinger, Sandra A. "Synthesis and structure-property relationships in selected metal fluorides." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/2030.

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There has been an increase in the interest in fluoride materials over the last decade. This interest has focused on multiferroic materials and kagome lattices, to name but a few areas. This thesis focuses on the synthesis and crystallographic characterisation of selected transition metal fluorides and oxyfluorides. Work is presented on the tetragonal tungsten bronze solid solutions of KₓFeF₃, where x = 0.58 and x ≈ 0.5, and the copper analogue, K₃Cu₃Fe₂F₁₅; the kagome structure of Cs₂ZrCu₃F₁₂; and hydrothermal reactions using vanadium, manganese, or molybdenum as the transition metals in the f
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20

Sneddon, Scott. "Characterisation of inorganic materials using solid-state NMR spectroscopy." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/8239.

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This thesis uses solid-state nuclear magnetic resonance (NMR) spectroscopy and density functional theory (DFT) calculations to study local structure and disorder in inorganic materials. Initial work concerns microporous aluminophosphate frameworks, where the importance of semi-empirical dispersion correction (SEDC) schemes in structural optimisation using DFT is evaluated. These schemes provide structures in better agreement with experimental diffraction measurements, but very similar NMR parameters are obtained for any structures where the atomic coordinates are optimised, owing to the simila
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21

Yamamoto, Hiroki. "Syntheses, Structures, and Applications of Inorganic Materials Functionalized by Fluorine." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263756.

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22

Shi, Hongting. "Defect structure and optical properties of alkaline earth fluorides." Doctoral thesis, [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=984572015.

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23

Meng, Nan. "Processing, structure and ferroelectric properties of PVDF-based ferroelectric polymers." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25910.

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Polyvinylidene fluoride (PVDF) and its copolymer with trifluoethylene (PVDF-TrFE) have been widely investigated. This is largely attributed to their ferroelectric properties, which are present in a limited number of polymers. In comparison with the more widely used ferroelectric ceramics, the ease of their fabrication makes them attractive in flexible electronic devices. Despite many advances in their application, we are still lacking a complete fundamental understanding of the relationship between their structure and the functional properties. The melt-extrusion of PVDF revealed that the α-ph
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24

Payne, Julia Louise. "Synthesis, structure and properties of mixed metal oxides : from pyrochlores to fluorites." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/646/.

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Introduction and Literature Review: Different families of oxide ion conductors and their applications are discussed. Experimental and Characterisation Methods: The synthetic methods and characterisation techniques used throughout this thesis are described. Synthesis, Structure and Transport Properties of Bi2Zr2-xTixO7 Phases: The characterisation of Bi2Zr2-xTixO7 compounds is reported for the first time. An increase in conductivity of 3 orders of magnitude is found for the Zr- rich end member. Bi2Ti2O7, which adopts centrosymmetric space group Fd-3m has been found to be SHG active. Structure S
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25

Salaeh, Subhan. "Élaboration des composites et mélanges à base de caoutchouc naturel : relations structure - propriétés." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10141/document.

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Le caoutchouc naturel (NR) et le caoutchouc époxydé (ENR) ont constitué la base de cette étude consacrée à l’étude des composites et mélanges de polymères. La présence du groupe époxyde a conduit à une amélioration des propriétés mécaniques de ces formulations en termes de module et de la résistance à la traction. De plus, l’utilisation de la spectroscopie diélectrique a révélé que les ENRs présentent une conductivité plus élevée que le NR à basse fréquence et à haute température. En particulier, le caoutchouc naturel époxidé contenant 50 mol% de groupes époxyde ENR-50 présente des conductivit
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26

Morelock, Cody Reeves. "Thermal expansion, compressibility, and local structure of fluorides and oxyfluorides with the rhenium trioxide structure." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53000.

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The simple cubic ReO₃-type framework has all of the key features required for negative thermal expansion (NTE) arising from the transverse thermal motion of bridging atoms and rotation of rigid polyhedra. Although ReO₃ itself only displays low NTE below ambient temperature, there is a potentially large family of isostructural fluorides and oxyfluorides that could display NTE. However, the coefficients of thermal expansion (CTE) of ReO₃-type materials range from strongly positive to strongly negative. Through extensive use of in situ synchrotron diffraction, this thesis examines the thermal
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27

Evangelakis, Georges. "Superconducteurs ioniques de structure fluorine : a) Mesure de la conductivité ionique du SrF à haute température : b) Etude des propriétés thermodynamiques du CaF par simulation numérique /." Saclay : Commissariat à l'énergie atomique, 1989. http://catalogue.bnf.fr/ark:/12148/cb35061250n.

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28

Carbeck, Jeffrey Davis. "Temperature dependent structure and properties of crystalline poly(vinylidene fluoride) from molecular simulation." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/11247.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.<br>Includes bibliographical references (leaves 129-134).<br>by Jeffrey Davis Carbeck.<br>Ph.D.
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29

Fleurette-Delobbe, Valérie. "Variations du type structural reo::(3) dans des fluorures et oxyfluorures de niobium iv : etude des interactions magnetiques." Paris 6, 1987. http://www.theses.fr/1987PA066373.

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Determination de la structure cristalline de nbf::(4) par diffraction de rayons x et de neutrons: structure bidimensionnelle a octaedres nbf::(6) etires; mise en evidence d'interactions antiferromagnetiques d'apres la variation thermique de la susceptibilite magnetique. Nbof::(2) possede le type structural reo::(3); absence de l'antiferromagnetisme attendu. Etude des proprietes magnetiques de tif::(3) et tinbof::(5): existence de couplages antiferromagnetiques avec des temperatures de neel de 48 et 54k respectivement. Determination des structures nucleaire et magnetique de fenbf::(6) qui est a
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30

Mirzadeh, Nedaossadat, and s3114476@student rmit edu au. "Synthesis, structures and reactions of new cyclometallated dinuclear gold complexes containing the fluorine-substituted ligands." RMIT University. Applied Sciences, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20081204.114414.

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The dinuclear cyclometallated gold(I) complex [Au2(μ-2-C6F4PPh2)2] was prepared in high yield from the reaction of 2-LiC6F4PPh2 with either [AuBr(AsPh3)] or [AuCl(tht)], and from the reaction of 2-Me3SnC6F4PPh2 with [AuCl(tht)]. The digold(I) complex undergoes oxidative addition reactions with halogens to give the metal-metal bonded dihalodigold(II) complexes [Au2IIX2(μ-2-C6F4PPh2)2] (X = Cl, Br, I), which on warming or exposure to light, isomerise to give the heterovalent gold(I)-gold(III) species [XAu(µ-2-C6F4PPh2)(κ2-2-C6F4PPh2)AuX] containing a four-membered cyclometallated ring on a
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31

Bakulin, A. V., S. E. Kulkova, and N. A. Valisheva. "Influence of Fluorine and Oxygen Adsorption on the Electronic Properties of the InAs(111)A-(2*2) Surface." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35298.

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Atomic and electronic structures of the reconstructed InAs(111)A-(2*2) surface are studied within den-sity functional theory. The most stable adsorption positions of oxygen and fluorine on the surface are de-termined. Our calculations show that oxygen adsorption leads to appearance of electronic states in band gap and the structure of these surface states strongly depends on adsorption geometry. An increase of oxy-gen concentration and its coadsorption with fluorine leads to substantial structural changes in the surface and subsurface layers due to adsorbate penetration into semiconductor. Evo
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32

Giraud, Sophie. "Nouvelles phases du système PbO-Bi2O3-M2O5 (M=P) : synthèses, structures, caractérisations et phases homologues (M=V, As)." Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-335.pdf.

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Plusieurs nouveaux oxyphosphates de bismuth et de plomb ont été synthétisés lors de l'étude du système ternaire PbO-Bi2O3-P2O5 ; des études structurales par diffraction des rayons X ont été essentiellement effectuées. Pb4BiPO8 cristallise dans une maille triclinique (groupe d'espace P 1) et sa structure présente de nombreuses similitudes avec celles de alpha-PbO et Pb5SO8. L'utilisation d'un rayonnement à courte longueur d'onde (source synchrotron) permet de s'affranchir du phénomène d'absorption et augmente la précision des résultats. PbBiPO5, de symétrie triclinique, subit une transformation
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33

Castiglione, Michael. "Computer simulation of superionic fluorides." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365812.

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34

Stankovic, Jovan. "Electrical thermal and structural studies of high conducting fluoride solid electrolytes." Thesis, Queen Mary, University of London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610965.

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35

Sato, Yuta. "Structures, Thermal Behaviors and Chemical Reactivity of Layered Carbon Fluorides." Kyoto University, 2004. http://hdl.handle.net/2433/147416.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(エネルギー科学)<br>甲第10970号<br>エネ博第81号<br>新制||エネ||24(附属図書館)<br>UT51-2004-G817<br>京都大学大学院エネルギー科学研究科エネルギー基礎科学専攻<br>(主査)教授 伊藤 靖彦, 教授 八尾 健, 助教授 萩原 理加<br>学位規則第4条第1項該当
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Girard-Alcindor, Valerian. "Above barrier narrow resonances in fluorine-15." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMC209.

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L’étude des noyaux non liés permet de tester notre compréhension du noyau atom- ique dans des conditions extrêmes. Dans cette thèse nous avons analysé deux expériences distinctes réalisées au GANIL au cours desquels nous avons étudié le fluor 15 situé deux neutrons au delà de la drip-line proton. Une des particularités intéressante de ce noyau est la présence d’états de parité négative particulièrement étroits et situés au dessus des barrières Coulombiennes et centrifuges. Nous nous sommes intéressés dans ce travail à ces états, nous avons confirmé l’existence du second état excité 1/2- et avo
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37

Grandjean, Didier. "Contribution à l'étude des solutions solides de type fluorine MF2-NdF3 et MF2-UF4 (M = Ca, Ba)." Montpellier 2, 1991. http://www.theses.fr/1991MON20032.

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Differentes compositions des solutions solides heterotypiques de type fluorine ba#1##xu#xf#2#+#2#x, ba#1##xnd#xf#2#+#x et ca#1##xnd#xf#2#+#x, ont ete preparees et caracterisees par diffraction des rayons x. Des mesures d'impedance, realisees jusqu'a 800c sur toutesles compositions, ont permis de mettre en evidence l'evolution des proprietes electriques et de caracteriser la conductivite en fonction de la composition et de la nature de l'ion aliovalent. Une etude par spectroscopie exafs des differentes compositions de la solution solide ba#1##xu#xf#2#+#2#x nous a permis, a la lumiere des mesure
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38

Basar, Burcin. "Structural, Mechanical, And Biocompatibility Investigations Of Yttrium And Fluoride Doped Nano Hydroxyapatite." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610331/index.pdf.

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In this study, it was aimed to investigate the structural, mechanical and biological properties of nano hydroxyapatite (HA) doped with yttrium and fluoride with different compositions. HAs were synthesized by precipitation method. After sintering at 900oC, 1100oC or 1300oC for 1 hour, the structural properties of HAs were investigated by XRD, FTIR spectroscopy and SEM. High relative densities (above 88 % of relative density) were achieved after sintering. No second phases were observed in XRD measurements. Hexagonal lattice parameters and unit cell volumes of doped HAs decreased indicating the
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39

Sun, Zehra Pinar. "Structural And Mechanical Investigations Of Magnesium And Fluoride Doped Nano Calcium Phosphates." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610764/index.pdf.

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The aim of this study was to investigate the microstructure and mechanical properties of pure and Mg2+ and F- doped nano-calcium phosphate (CaP) powders, which were synthesized by precipitation method. After the drying and calcination processes, the samples were sintered at 1100&ordm<br>C for 1 hour. High densities were achieved except for the 7.5 % mole Mg doped samples. Microstructure of the CaPs were investigated by X- ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Due to the Mg substitution, &amp<br>#946<br>-TCP phase was detec
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40

Vik, Aasmund Fahre. "Structure and solubility of niobium and tantalum complexes in molten alkali fluorides /." Doctoral thesis, Norwegian University of Science and Technology, Department of Chemistry, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1937.

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41

Laborde, Pascale. "Influence de l'oxygène sur les propriétés de conduction ionique de fluorures de structure fluorine ou dérivée." Bordeaux 1, 1986. http://www.theses.fr/1986BOR10628.

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Etude des correlations entre les proprietes de transport et l'ordre local au sein de materiaux oxyfluores faisant intervenir divers mecanismes formels de substitution du fluor par l'oxygene. Ce travail s'appuie sur des etudes par impedance complexe, simulation sur ordinateur, resonance magnetique nucleaire et diffraction de neutrons des solutions solides appartenant aux systemes ternaires kf-bif::(3)-biof et pbf::(2)-bif::(3)-biof. Un modele d'arrangement anionique base sur l'association de cubelets f::(8) et cubooctaedres f::(12) a ete propose pour les phases k::(1-x)bi::(x)o::(z)f::(1+2x-2z)
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42

Preda, Ana Maria, Ciprian I. Raţ, Cristian Silvestru, Heinrich Lang, Tobias Rüffer, and Michael Mehring. "Hypervalent diorganoantimony(III) fluorides via diorganoantimony(III) cations – a general method of synthesis." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-197814.

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Novel diorganoantimony(III) fluorides containing ligands with pendant arms, R2SbF (5), (R)PhSbF (6) [R = 2-(2′,6′-iPr2C6H3N[double bond, length as m-dash]CH)C6H4], R′′2SbF (7) and (R′′)PhSbF (8) [R′′ = 2-(Me2NCH2)C6H4], were prepared via the ionic derivatives [R2Sb]+[PF6]− (1), [(R)PhSb]+[PF6]− (2), [R′′2Sb]+[SbF6]− (4) and [(R′′)PhSb]+[SbF6]− (obtained in situ) by treatment with [Bu4N]F·3H2O. The ionic species used as starting materials as well as [R′2Sb]+[PF6]− (3) [R′ = 2-(2′,4′,6′-Me3C6H2N[double bond, length as m-dash]CH)C6H4] were obtained from the corresponding bromides or chlorides and
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43

Orhan, Emmanuelle. "Etude théorique et expérimentale d'(oxy)nitrures : synthèse, caractérisation, structure électronique des nitrures M3N2 (M=Be,Mg,Ca,Sr,Ba) et Ta3N5 et des oxynitrures TaON,Ln2Ta2O5N2 et Ln2(Zr,W)2(O,N,0)8 (Ln=élément de terre rare)." Rennes 1, 2002. http://www.theses.fr/2002REN10091.

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L'objectif principal de ce travail est d'établir des relations entre la composition chimique, la structure cristalline et électronique de composés (oxy)nitrures colorés d'une part et leurs propriétés optiques d'autre part. La couleur de ces composés semiconducteurs est due à des transitions interbandes entre la bande de valence et la bande de conduction. Dans un tel mécanisme, la couleur peut aller du noir au blanc en passant par le marron, le rouge, le orange et le jaune, selon la taille du gap, en d'autres termes, selon la position du front d'absorption dans le spectre UV-visible-proche IR.
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44

Laborde, Pascale. "Influence de l'oxygène sur les propriétés de conduction ionique de fluorures de structure fluorine ou dérivée." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598829x.

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45

Le, Huyen Quyen [Verfasser], Lothar [Gutachter] Wondraczek, and Doris [Gutachter] Ehrt. "Structure-property correlations in fluoride-sulfate-phosphate glasses / Huyen Quyen Le ; Gutachter: Lothar Wondraczek, Doris Ehrt." Jena : Friedrich-Schiller-Universität Jena, 2020. http://d-nb.info/1207320137/34.

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46

Donakowski, Martin Daniel. "Syntheses, Local Environments, and Structure-Property Relationships of Solid- State Vanadium Oxide-Fluorides." Thesis, Northwestern University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3615500.

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<p> Vanadium oxide-fluorides can exhibit properties of piezoelectricity, second harmonic generation (SHG) activity, electrochemical activity, and other phenomena. The first two properties derive from the second-order and Jahn-Teller distortions, respectively, of d<sup>0</sup> and d<sup>1</sup> vanadium; the electrochemistry derives from the reduction of V<sup>V</sup> to V<sup> IV,III,II</sup>. </p><p> An examination of the immediate environment of a vanadium cation facilitates an understanding of how a cation influences the structure of a compound and its resulting properties. In the inorga
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47

Gervais, Jean-François. "Cristallochimie de fluorozirconates d'élements trivalents. Corrélations entre caractéristiques structurales et spectroscopiques de quelques fluorures d'étain divalent." Phd thesis, Université Sciences et Technologies - Bordeaux I, 1995. http://tel.archives-ouvertes.fr/tel-00142661.

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L'étude du système TIF3-ZrF4 a permis de mettre en évidence deux composes: TI0,67Zr0,33F3,33 et TIZr3F15. Les structures dérivent du type ReO3 par insertion d'anions. La répartition cationique dans les phases MZr3F15 a par ailleurs été précisée en fonction de la taille du cation trivalent. Les fluorostannates des systèmes MF-SnF2 (M = Na, K, Rb, Cs, TI et NH4) ont été étudiés par spectroscopie Mössbauer de 4,2 a 293K. L'interprétation de l'ensemble des paramètres Mössbauer a été assoçiée à la présence du doublet libre de l'étain. Des corrélations entre caractéristiques structurales et spectros
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48

Martin, Amélie. "Sulfonation du polyfluorure de vinylidène (PVDF) : Analyse structurale par RMN multinoyaux {1H, 13C, 19F}." Electronic Thesis or Diss., Normandie, 2022. http://www.theses.fr/2022NORMR117.

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Ce travail de thèse a pour objectifs de comprendre le processus de sulfonation du PVDF par l’acide chlorosulfonique et ceci afin de pouvoir préparer des membranes polymères avec un degré de sulfonation optimal pour une utilisation en PEMFC.Dans une première partie, l’influence de la température, la durée de la réaction et la concentration en acide sur la sulfonation a été évaluée. Les données obtenues par IRTF, AE, ATG, ACD et RMN ont permis de comprendre le mécanisme de sulfonation et de montrer que la déhydrofluoration est un préalable nécessaire et indispensable à la sulfonation de la chain
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49

Kirinda, Viraj C. "Well-Controlled Ortho-Phenylene-Based Higher-Order Structures." Miami University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=miami1625137591219366.

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50

AL, SALEH ISMAIL. "Oxyde, fluorure et oxyfluorure de graphite : synthese-etude structurale-proprietes electrochimiques." Clermont-Ferrand 2, 1992. http://www.theses.fr/1992CLF21434.

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On distingue deux grandes classes de composes d'intercalation du graphite: les composes covalents et les composes ioniques formes par transfert de charge. Ce memoire est consacre a la synthese de composes covalents puis a la caracterisation structurale et electrochimique (systeme a electrolyte organique liquide et electrolyte polymere solide) de l'oxyde, du fluorure et de l'oxyfluorure de graphite. L'etude des composes par spectroscopie ir, par rmn du #1#9f, 1h, 13c et par diffraction des rayons x a permis de montrer que dans ces produits les liaisons c-o et c-f ont un caractere covalent avec
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