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Articoli di riviste sul tema "Quenched-in fluorite type structure"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Webster, Nathan A. S., Chris D. Ling, and Frank J. Lincoln. "Structure–property relationships in fluorite-type Bi2O3–Yb2O3–PbO solid-electrolyte materials." Powder Diffraction 29, S1 (November 21, 2014): S73—S77. http://dx.doi.org/10.1017/s0885715614001079.

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New quenched-in face-centred cubic fluorite-type materials were synthesised in the Bi2O3–Yb2O3–PbO system. After annealing in air at 500 °C for up to 200 h, each material underwent a conductivity-lowering structural transformation, thus making them unsuitable for use as solid electrolytes in solid-oxide fuel cells. For example, (BiO1.5)0.80(YbO1.5)0.17(PbO)0.03 underwent a fluorite- to Bi17Yb7O36-type orthorhombic transformation, indicative of long-range cation ordering, and (BiO1.5)0.80(YbO1.5)0.11(PbO)0.09 underwent a fluorite- to β-Bi2O3-type tetragonal transformation, indicative of long-ra

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2

Landa-Cánovas, Á. R., Eladio Vila, Jorge Hernández-Velasco, Jean Galy, and Alicia Castro. "Transmission Electron Microscopy Study of Low Mo-content Bi-Mo-O Phases." Microscopy and Microanalysis 18, S5 (August 2012): 71–72. http://dx.doi.org/10.1017/s1431927612013013.

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δ-Bi2O3, a material with a fluorite-type structure, is one of the best solid-state oxygen-ion conductors. It is a high-temperature form that cannot be quenched to room temperature. However, doping with small amounts of transition metal oxides preserves the δ-Bi2O3 structure at low temperature and retains its anionic conduction properties. The Bi2O3–MoO3 materials are interesting because of their functional properties, chiefly as catalysts and as good ionic conductors. All the phases in this system are related to the fluorite structure except Bi2MoO6 which shows an Aurivillius-type structure.

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3

Sorokin, N. I. "Polarizability of Fluoride Ions in Fluorides with Fluorite-Type Structure." Crystallography Reports 45, no. 6 (November 2000): 976. http://dx.doi.org/10.1134/1.1327662.

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4

Lucid, Aoife K., Aoife C. Plunkett, and Graeme W. Watson. "Predicting the Structure of Grain Boundaries in Fluorite-Structured Materials." Johnson Matthey Technology Review 63, no. 4 (October 1, 2019): 247–54. http://dx.doi.org/10.1595/205651319x15598975874659.

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Interfaces are a type of extended defect which govern the properties of materials. As the nanostructuring of materials becomes more prevalent the impact of interfaces such as grain boundaries (GBs) becomes more important. Computational modelling of GBs is vital to the improvement of our understanding of these defects as it allows us to isolate specific structures and understand resulting properties. The first step to accurately modelling GBs is to generate accurate descriptions of the structures. In this paper, we present low angle mirror tilt GB structures for fluorite structured materials (c

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5

Withers, RL, JG Thompson, PJ Barlow, and JC Barry. "The Defect Fluorite Phase in the ZrO2-PrO1.5 System and Its Relationship to the Structure of Pyrochlore." Australian Journal of Chemistry 45, no. 9 (1992): 1375. http://dx.doi.org/10.1071/ch9921375.

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A detailed transmission electron microscope and X-ray powder diffraction study has been made of the so-called 'defect fluorite' phase field in the ZrO2-PrO1.5 system and of its close relationship to the pyrochlore solid solution field in the same system. Even for the lowest possible PrO1.5 content within the 'defect fluorite' phase field, it is clear that the sharp Bragg reflections characteristic of the underlying fluorite average structure are accompanied by some of the 'satellite reflections' characteristic of the pyrochlore solid solution field. As the PrO1.5 content increases, these satel

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6

Shiraki, Koichi, Taku Tsuchiya, and Shigeaki Ono. "Structural refinements of high-pressure phases in germanium dioxide." Acta Crystallographica Section B Structural Science 59, no. 6 (November 25, 2003): 701–8. http://dx.doi.org/10.1107/s0108768103021761.

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Recently, there has been substantial interest in the new high-pressure polymorphs of GeO2 synthesized in the laboratory. Previous investigators reported the synthesis of `CaCl2-type', `α-PbO2-type' and `pyrite-type (modified-fluorite-type)' GeO2 at pressures of 30–130 GPa in laser-heated diamond anvil cells. In order to provide definitive information about the new high-pressure polymorphs, we performed Rietveld refinements of the structures. The structure refinements confirm that two of these high-pressure phases do have the α-PbO2-type and pyrite-type (modified-fluorite-type) structures.

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7

Ye, Fei, Ding Rong Ou, and Toshiyuki Mori. "Microstructural Evolution in a CeO2-Gd2O3 System." Microscopy and Microanalysis 18, no. 1 (December 15, 2011): 162–70. http://dx.doi.org/10.1017/s1431927611012396.

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AbstractMicrostructural evolution in a CeO2-Gd2O3 system at atomic and nanoscale levels with increasing Gd concentration has been comprehensively investigated by transmission electron microscopy. When the Gd concentration was increased from 10 to 80 at.%, the phase transformation from ceria with fluorite structure to solid solution with C-type structure was not a sudden change but an evolution in the sequence of clusters, domains, and precipitates with C-type structure in the fluorite-structured matrix. Moreover, the ordering of aggregated Gd cations and oxygen vacancies in these microstructur

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8

Rossell, HJ, M. Leblanc, G. Ferey, DJM Bevan, DJ Simpson, and MR Taylor. "On the Crystal Structure of Bi2Te4O11." Australian Journal of Chemistry 45, no. 9 (1992): 1415. http://dx.doi.org/10.1071/ch9921415.

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Bi2Te4O11 is monoclinic, space group P21/n; the lattice parameters derived from a Guinier powder pattern ( Si standard) are: a = 6.9909(3), b = 7.9593(3), c = 18.8963(8) � , β = 95.176(3)�, Z = 4, V = 1047.15 �. The structure was solved independently from both single-crystal X-ray data and a combination of X-ray and neutron powder data. It is an anion-deficient superstructure of fluorite in which can be recognized the ordered intergrowth of fluorite-type Bi2Te2O7 and rutile-type Te2O4. Lone-pair electrons are stereochemically active.

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9

Achary, S. N., S. J. Patwe, and A. K. Tyagi. "Powder XRD study of Ba4Eu3F17: A new anion rich fluorite related mixed fluoride." Powder Diffraction 17, no. 3 (September 2002): 225–29. http://dx.doi.org/10.1154/1.1477198.

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The compound Ba4Eu3F17 was prepared by heating pre-dried BaF2 and EuF3 (4:3) at 800 °C for 8 h in static vacuum. The colorless polycrystalline product obtained was characterized by Rietveld refinement of the observed powder diffraction data with a starting model of Ba4Y3F17. The title compound Ba4Eu3F17 crystallizes in rhombohedral lattice with lattice parameters, a=11.1787(4) and c=20.5789(10) Å, Z=3 (Space group R 3, No. 148). The Ba4Eu3F17 structure can be described as an ordered anion-rich fluorite type structure with the formation of Eu6F37 clusters. There are two crystallographically dis

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10

Kennedy, Brendan, Peter Blanchard, Emily Reynolds, and Zhaoming Zhang. "Transformation from pyrochlore to fluorite by diffraction and X-ray spectroscopy." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C234. http://dx.doi.org/10.1107/s2053273314097654.

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We have studied the long-range average and local structures in a number of zirconium containing materials of the type A2B2O7 ( A = Ln or Y; B = Zr, Hf or Sn) using synchrotron X-ray and neutron powder diffraction and X-ray absorption spectroscopy. Studies of the system Gd2-xTbxZr2O7 include neutron diffraction data, obtained at λ ≍ 0.497 Å to minimise absorption, not only provide evidence for independent ordering of the anion and cation sublattices, but also suggest that the disorder transition across the pyrochlore-defect fluorite boundary of Ln2Zr2O7 is rather gradual. In general we observe

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11

Schneider, Julius, and Wolfgang Schmahl. "Superionic phase transitions in anti-fluorite structures." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C72. http://dx.doi.org/10.1107/s2053273314099276.

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Fast ion conductors attract continuous and increasing interest in view of possible applications in battery technology. Early examples of superionic phase transitions in anti-fluorite type structures, where the small cations reside in a tetrahedral cage of large anions include Ag2Te [1]. At elevated temperatures anharmonic atom thermal displacements induce cation diffusion towards the large void formed by the central anion octahedron. Of the anti-fluorite structure type compounds Li2 X, where X=(O, S, Se, Te), the compounds Li2O and Li2S showed diffuse transitions to a superionic phase. Very re

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12

Pérez-Estébanez, M., R. Pastrana-Fábregas, J. Isasi-Marín, and R. Sáez-Puche. "Inorganic pigments based on fluorite-type oxynitrides." Journal of Materials Research 21, no. 6 (June 1, 2006): 1427–33. http://dx.doi.org/10.1557/jmr.2006.0177.

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Zirconia oxynitride rare-earth-doped pigments were prepared by ammonolysis of the zirconium rare-earth oxides, previously synthesized using the citrate complexation/calcination route. Different coloration has been obtained, the intensity of which is a function of the nitrogen amount in the case of the oxynitrides; in the case of the oxides, both color and intensity depend on the doping amount of rare earth. The obtained phases, Zr(1−x)CexO2, Zr(1−x)RxO(2−x/2)□x/2, with R = Eu or Er and Zr(1−x)RxO(2−x/2−3/2y)Ny□x/2■y/2 (R = Ce, Eu, and Er), have been characterized by x-ray powder diffraction, s

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13

Checchia, Stefano, Marco Scavini, Mattia Allieta, Michela Brunelli, Claudio Ferrero, and Mauro Coduri. "Size and spatial correlation of defective domains in yttrium-doped CeO2." Powder Diffraction 30, S1 (May 22, 2015): S119—S126. http://dx.doi.org/10.1017/s0885715615000135.

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The size of dopant-rich nanodomains was assessed in four samples of Ce1−μYμO2−μ/2 through systematic pair distribution function (PDF) refinements. Experimental G(r) curves were fitted by different structural models with the aim of finding a description which balanced precise structure parameterization and reasonable number of parameters. The most reliable model was a single Y2O3-like phase, which best accommodated to the close relationship between the fluorite (CeO2-like) and C-type (Y2O3-like) structures. In this model, a refined cation coordinate, x(M2), measured the relative occurrence in t

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14

Ling, Christopher D., Siegbert Schmid, Ray L. Withers, John G. Thompson, Nobuo Ishizawa, and Shunji Kishimoto. "Solution and refinement of the crystal structure of Bi7Ta3O18." Acta Crystallographica Section B Structural Science 55, no. 2 (April 1, 1999): 157–64. http://dx.doi.org/10.1107/s0108768198011148.

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The structure of heptabismuth tritantalum octadecaoxide, Bi7Ta3O18, has been solved and refined using single-crystal X-ray diffraction data collected at a synchrotron source in conjunction with unit-cell and symmetry information derived from electron diffraction. The space-group symmetry is triclinic C1 but is very close to monoclinic C2/m. A twin component observed during data collection was successfully modelled in the refinement. The C2/m prototype fitted all the Rietveld-refinable features of a medium-resolution neutron powder diffraction pattern. The metal-atom array is approximately face

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15

Muñoz, R. A., Paola Cristina Cajas, J. E. Rodriguez, A. C. Rodrigues, and Cosme R. M. Silva. "Polycrystalline Tetragonal Zirconia of the Form ZrO₂: 3 mol% Re₂O₃ (Re-TZP) for Use in Oxygen Sensors: Synthesis, Characterization and Ionic Conductivity." Materials Science Forum 798-799 (June 2014): 145–53. http://dx.doi.org/10.4028/www.scientific.net/msf.798-799.145.

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Oxygen ion conductors of zirconia based ceramics are a class of materials with technological applications in several application areas: sensors of chemical species, oxygen pumps, solid oxide fuel cells among others [1]. For these applications, the zirconia must possess the fluorite type crystal structure, or close to it. Such oxides with this structure are the classic oxygen ion conductors [2]. The fluorite structure consists of a cubic lattice of oxygen ions surrounded by cations. The cations are arranged in a face centered cubic structure with anions occupying tetrahedral positions. This lea

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16

Ho, Herbert L., Charles L. Bauer, Subhash Mahajan, David E. Laughlin, and Arthur G. Milnes. "Microstructural characterization of ordered nickel silicide structures grown on (111) nickel silicide films." Journal of Materials Research 11, no. 4 (April 1996): 904–11. http://dx.doi.org/10.1557/jmr.1996.0112.

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The formation processes of epitaxial nickel silicides, resulting from the interaction of nickel silicide films (10 nm–100 nm) on (111) silicon (Si) substrates after furnace annealing, have been studied using transmission electron microscopy (TEM) and x-ray diffraction (XRD) techniques. The formation of type-A epitaxial grains (i.e., grown with the same orientation of the underlying Si substrate) and type-B epitaxial grains (i.e., rotated by 180± around the surface normal) in “thick” epitaxial films (i.e., greater than 35 nm) is proposed to be linked to the formation of a fluorite-based CuPt (L

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17

Le Bail, Armel, Anne-Marie Mercier, and Ina Dix. "Sr5(VIVOF5)3F(H2O)3refined from a non-merohedrally twinned crystal." Acta Crystallographica Section E Structure Reports Online 65, no. 6 (May 23, 2009): i46—i47. http://dx.doi.org/10.1107/s1600536809019126.

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The title compound, pentastrontium tris[pentafluoridooxidovanadate(IV)] fluoride trihydrate, was obtained under hydrothermal conditions. Its crystal structure has been refined from intensity data of a non-merohedrally twinned crystal. Two domains in almost equal proportions are related by a −180° rotation along the reciprocal [101]* vector. The structure may be considered as a derivative of the fluorite structure type, adopted here by SrF2. In the title compound, fluorite-like large rods are recognized, built up from a group of 16 Sr atoms of which 6 are substituted by V atoms, leading to [Sr1

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18

Le Bail, A. "Ab initio structure determination of nanosized θ-KAlF4 with edge-sharing AlF6 octahedra". Powder Diffraction 24, № 3 (вересень 2009): 185–90. http://dx.doi.org/10.1154/1.3194692.

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θ-KAlF4 is a new nanosized potassium tetrafluoroaluminate metastable polymorph (13×18×55 nm3). The crystal structure is solved ab initio from X-ray powder diffraction data in direct space [orthorhombic unit cell with a=8.3242(3) Å, b=7.2502(3) Å, c=11.8875(4) Å, V=717.44(5) Å3, Z=8, and space group Pnma]. This new structure type, unique in the whole AIMIIIF4 family, is related to the fluorite structure and consists of AlF6 octahedra linked via a common edge forming a bioctahedral motif which is trans-connected through the corner-shared fluorine, resulting in the formation of infinite ladderlik

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19

Ling, Christopher D., Ray L. Withers, John G. Thompson, and Siegbert Schmid. "Structures of Bi14WO24 and Bi14MoO24 from neutron powder diffraction data." Acta Crystallographica Section B Structural Science 55, no. 3 (June 1, 1999): 306–12. http://dx.doi.org/10.1107/s0108768198014086.

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The (isomorphous) structures of Bi14WO24, tetradecabismuth tungsten tetracosaoxide, and Bi14MoO24, tetradecabismuth molybdenum tetracosaoxide, have been solved and refined using neutron powder diffraction data in the space group I4/m. The metal-atom array is fully ordered in terms of composition, and in terms of atomic positions deviates only slightly from a fluorite-type δ-Bi2O3-related parent structure. Three independent O-atom sites (accounting for 70 out of 78 O atoms in the unit cell) are also very close to fluorite-type parent positions. The remaining two O-atom sites, which coordinate W

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20

Scavini, Marco, Mauro Coduri, Mattia Allieta, Paolo Masala, Serena Cappelli, Cesare Oliva, Michela Brunelli, Francesco Orsini, and Claudio Ferrero. "Percolating hierarchical defect structures drive phase transformation in Ce1−xGdxO2−x/2: a total scattering study." IUCrJ 2, no. 5 (July 30, 2015): 511–22. http://dx.doi.org/10.1107/s2052252515011641.

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A new hierarchical approach is presented for elucidating the structural disorder in Ce1−xGdxO2−x/2solid solutions on different scale lengths. The primary goal of this investigation is to shed light on the relations between the short-range and the average structure of these materialsviaan analysis of disorder on the mesocopic scale. Real-space (pair distribution function) and reciprocal-space (Rietveld refinement and microstructure probing) analysis of X-ray powder diffraction data and electron spin resonance (ESR) investigations were carried out following this approach. On the local scale, Gd-

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21

Ishizawa, N., Y. Matsushima, M. Hayashi, and M. Ueki. "Synchrotron radiation study of yttria-stabilized zirconia, Zr0.758Y0.242O1.879." Acta Crystallographica Section B Structural Science 55, no. 5 (October 1, 1999): 726–35. http://dx.doi.org/10.1107/s0108768199005108.

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The fluorite-related cubic structure of yttria-stabilized zirconia, Zr0.75 8Y0.24 2O1.87 9, has been studied by single-crystal X-ray diffraction using synchrotron radiation and by EXAFS. Two diffraction data sets obtained at X-ray energies of 512 and 10 eV below the Y K edge revealed that in the average structure Zr atoms are displaced from the origin of the space group Fm3¯m along 〈111〉 by 0.19 Å, while Y atoms reside at the origin. Approximately 48% of the O atoms occupy the ideal position in the fluorite-type structure, while 43% of O atoms are displaced from the ideal position along 〈001〉

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22

Gudat, Axel, Sabine Haag, Rüdiger Kniep, and Albrecht Rabenau. "Ternäre Nitride des Lithiums mit den Elementen Cr, Mo und W / Ternary Lithium Nitrides with Elements Cr, Mo and W." Zeitschrift für Naturforschung B 45, no. 2 (February 1, 1990): 111–20. http://dx.doi.org/10.1515/znb-1990-0203.

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The ternary compounds were prepared by reaction of the transition metals with Li3N melt under nitrogen. The crystal structures of Li6MeN4 (P42/nmc, Z = 2; Me = Mo: a = 667.3(1) pm, c = 492.5(3) pm; Me = W: a = 667.9(1) pm, c = 492.7(1) pm) and Li15Cr2N9 (P4/ncc, Z = 4; a = 1023.3(5) pm, c = 938.9(7) pm) can be described as fluorite-type superstructures with the lithium and transition metal atoms in tetrahedral holes of the nearly fcc nitrogen arrangement and with an ordered distribution of defects within the cation substructure. In addition, the ternary system Li–Cr–N contains the compound Li6

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23

Molnár, Zsuzsa, Gabriella B. Kiss, Ferenc Molnár, Tamás Váczi, György Czuppon, István Dunkl, Federica Zaccarini, and István Dódony. "Epigenetic-Hydrothermal Fluorite Veins in a Phosphorite Deposit from Balaton Highland (Pannonian Basin, Hungary): Signatures of a Regional Fluid Flow System in an Alpine Triassic Platform." Minerals 11, no. 6 (June 16, 2021): 640. http://dx.doi.org/10.3390/min11060640.

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The middle Anisian extensional tectonics of the Neotethyan realm developed a small, isolated carbonate platform in the middle part of the Balaton Highland (western Hungary), resulted in the deposition of uranium-bearing seamount phosphorite on the top of the drowned platform and produced some epigenetic fluorite veins in the Middle Triassic sequence. The stable C-O isotope data of carbonates are shifted from the typical Triassic carbonate ranges, confirming the epigenetic-hydrothermal origin of veining. Primary fluid inclusions in fluorite indicate that these veins were formed from low tempera

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24

Hairetdinov, E. "Estimation of conductivity parameters in Sr1 − xThxF2 + 2x solid solution with fluorite-type structure." Solid State Ionics 90, no. 1-4 (September 1996): 177–81. http://dx.doi.org/10.1016/s0167-2738(96)00407-9.

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Sreena, T. S., P. Prabhakar Rao, Athira K. V. Raj, and T. R. Aju Thara. "Exploitation of Eu3+ red luminescence through order–disorder structural transitions in lanthanide stannate pyrochlores for warm white LED applications." Physical Chemistry Chemical Physics 20, no. 37 (2018): 24287–99. http://dx.doi.org/10.1039/c8cp03863e.

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The structural transition from an ordered pyrochlore to a fluorite-type structure in Ln<sub>2.85</sub>YSnNbO<sub>10.5</sub>:0.15Eu<sup>3+</sup> (Ln = La, Gd, Y, and Lu) provides a gateway for exploiting Eu<sup>3+</sup> red luminescence for warm white LED applications.

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Fagherazzi, G., P. Canton, A. Benedetti, F. Pinna, G. Mariotto, and E. Zanghellini. "Rietveld analysis of the cubic crystal structure of Na-stabilized zirconia." Journal of Materials Research 12, no. 2 (February 1997): 318–21. http://dx.doi.org/10.1557/jmr.1997.0044.

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Using x-ray Rietveld analysis the fcc (fluorite-type) structure of a Na-containing nanocrystalline zirconia powder (9.5 nm estimated crystallite size) obtained by precipitation and calcination has been confirmed. The result shows that conventional x-ray diffraction techniques can distinguish the cubic crystallographic form of ZrO2 from the tetragonal one in nanosized powders. These conclusions are supported by independent Raman scattering experiments.

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Yagi, Yuhji, Jun Satake, Miwa Saito та Hiroshi Yamamura. "Electrode Effects on Dielectric Relaxation in Oxide-Ion Conductor Ce0.7Yb0.3O2-δHaving a Fluorite-Type Structure". Japanese Journal of Applied Physics 50, № 6R (1 червня 2011): 065804. http://dx.doi.org/10.7567/jjap.50.065804.

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Yagi, Yuhji, Jun Satake, Miwa Saito та Hiroshi Yamamura. "Electrode Effects on Dielectric Relaxation in Oxide-Ion Conductor Ce0.7Yb0.3O2-δHaving a Fluorite-Type Structure". Japanese Journal of Applied Physics 50, № 6 (20 червня 2011): 065804. http://dx.doi.org/10.1143/jjap.50.065804.

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Newman, R., R. D. Aughterson, and G. R. Lumpkin. "Synthesis and Structure of Novel A2BO5 Compounds Containing A = Y, Yb, Gd, Sm, and La and B = Zr, Ti, and Sn." MRS Advances 3, no. 20 (2018): 1117–22. http://dx.doi.org/10.1557/adv.2018.210.

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With the aim of creating novel ceramics for applications in nuclear materials with high radiation tolerance, multiple samples with A-B-O stoichiometries ranging from 215 to 227 were synthesized and characterized by a combination of SEM, XRD, and TEM methods. Single-phase defect-fluorite-type compounds with A = Sm or Yb and B = Ti, Zr, and/or Sn are reported; whereas, pyrochlore structured compounds and lanthanide sesquioxide phases were found as major phases in numerous samples. A series of Y-b-Sn-O samples was successfully prepared as nearly single phase or single phase materials. These are e

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Kornienko, Oksana, Anatoliy Sameljuk, Olena Andrievskaya, Serhii Yushkevych, and Yurii Bataev. "Phase Equilibrium in ZrO2-CeO2-Eu2O3 System at a Temperature of 1500 °C." Recent Progress in Materials 03, no. 03 (May 24, 2021): 1. http://dx.doi.org/10.21926/rpm.2103036.

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The phase equilibria and structural transformations in the ternary ZrO2-CeO2-Eu2O3 system at 1500 °C were studied by X-ray diffraction and scanning electron microscopy in the overall concentration range. The system was found to constitute fields of solid solutions based on the tetragonal (Т) modification of ZrО2, cubic (С) and monoclinic (B) modifications of Eu2O3, cubic with a fluorite-type structure (F) modifications of СеО2 (ZrО2), and ordered intermediate phase with a pyrochlore-type structure of Eu2Zr2O7 (Py). The refined lattice parameters of the unit cells corresponding to the solid sol

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Camprubí, Antoni, Eduardo González-Partida, Antonin Richard, Marie-Christine Boiron, Luis González-Ruiz, César Aguilar-Ramírez, Edith Fuentes-Guzmán, Daniel González-Ruiz, and Claire Legouix. "MVT-Like Fluorite Deposits and Oligocene Magmatic-Hydrothermal Fluorite–Be–U–Mo–P–V Overprints in Northern Coahuila, Mexico." Minerals 9, no. 1 (January 18, 2019): 58. http://dx.doi.org/10.3390/min9010058.

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The formation of most fluorite deposits in northern Coahuila (NE Mexico) is explained by MVT models, and is a part of the metallogenic province of northeastern Mexico. However, fluorite skarn deposits also occur in the same region, and there is evidence for late hydrothermal manifestations with no clear origin and evolution. The latter are the main focus of this study; in particular, F–Be–U–Mo–V–P stringers in the Aguachile-Cuatro Palmas area that overprint preexisting fluorite mantos. The region experienced the emplacement of several intrusives during the Eocene and the Oligocene that are col

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32

Ribárik, G., N. Audebrand, H. Palancher, T. Ungár, and D. Louër. "Dislocation densities and crystallite size distributions in nanocrystalline ball-milled fluorides,MF2(M= Ca, Sr, Ba and Cd), determined by X-ray diffraction line-profile analysis." Journal of Applied Crystallography 38, no. 6 (November 12, 2005): 912–26. http://dx.doi.org/10.1107/s0021889805027202.

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The dislocation densities and crystallite size distributions in ball-milled fluorides,MF2(M= Ca, Sr, Ba and Cd), of the fluorite structure type have been determined as a function of milling time by X-ray diffraction line-profile analysis. The treatment has been based on the concept of dislocation contrast to explain strain anisotropy by means of the modified Williamson–Hall and Warren–Averbach approaches and a whole-profile fitting method using physically based functions. In most cases, the measured and calculated patterns are in perfect agreement; however, in some specific cases, the first fe

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33

Maki, Ryosuke S. S., and Peter E. D. Morgan. "A further investigation of the complex M3 murataite structure using Hf substitution and STEM-EELS techniques." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 75, no. 3 (May 25, 2019): 442–48. http://dx.doi.org/10.1107/s2052520619005419.

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Abstract (sommario):

Many members of the complex crystalline fluorite supercell structures (e.g. zirconolite, pyrochlore and murataite polytypes) have been considered/studied for possible long-term radioactive-waste immobilization. The eight-coordinated sites in these crystals are of particular importance because they are preferred for the accommodation of trivalent rare earths and actinides present in radioactive waste from fuel element processing. The fluorite-type supercell structures include the murataites, M3, M5, M7, M8, having those numbers of repeating fluorite sub-cell units. One simple technique, as show

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34

Miida, Rokuro, та Michiyoshi Tanaka. "A Modulated Structure in a Fluorite-Type Fast-Ion-Conductor δ-(Bi2O3)1-x(Nb2O5)x". Japanese Journal of Applied Physics 29, Part 1, No. 6 (20 червня 1990): 1132–38. http://dx.doi.org/10.1143/jjap.29.1132.

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35

Lamas, D. G., R. O. Fuentes, I. O. Fábregas, M. E. Fernández de Rapp, G. E. Lascalea, J. R. Casanova, N. E. Walsöe de Reca, and A. F. Craievich. "Synchrotron X-ray diffraction study of the tetragonal–cubic phase boundary of nanocrystalline ZrO2–CeO2synthesized by a gel-combustion process." Journal of Applied Crystallography 38, no. 6 (November 12, 2005): 867–73. http://dx.doi.org/10.1107/s0021889805025343.

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Abstract (sommario):

The crystal structures of a number of nanocrystalline ZrO2–CeO2solid solutions, synthesized by a pH-controlled nitrate-glycine gel-combustion process, were studied. By using a synchrotron X-ray diffractometer, small peaks of the tetragonal phase, which correspond to forbidden reflections in the case of a perfect cubic fluorite structure, were clearly detected. By monitoring the most intense of these reflections, 112, as a function of the CeO2content, the tetragonal–cubic phase boundary was found to be at 85 (5) mol% CeO2. For a CeO2content up to 68 mol%, a tetragonal phase withc/a> 1 (known

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36

Landa-Cánovas, Ángel R., Eladio Vila, Jorge Hernández-Velasco, Jean Galy, and Alicia Castro. "Structural elucidation of the Bi2(n + 2)Mo n O6(n + 1) (n = 3, 4, 5 and 6) family of fluorite superstructures by transmission electron microscopy." Acta Crystallographica Section B Structural Science 65, no. 4 (July 16, 2009): 458–66. http://dx.doi.org/10.1107/s0108768109023908.

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The cationic framework structure of a whole new family of compounds with the general formula Bi2(n + 2)Mo n O6(n + 1) (n = 3, 4, 5 and 6) has been elucidated by transmission electron microscopy (TEM) methods. High-resolution transmission electron microscopy (HRTEM) has been used to postulate heavy-atom models based on the known structure of the n = 3 phase, Bi10Mo3O24. These models were tested by HRTEM image simulation, electron diffraction and powder X-ray diffraction simulation methods which agreed with the experimental results. The four known phases of this family correspond to n = 3, 4, 5

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37

Ohtaka, Osamu, Denis Andrault, Pierre Bouvier, Emmanuelle Schultz, and Mohamed Mezouar. "Phase relations and equation of state of ZrO2to 100 GPa." Journal of Applied Crystallography 38, no. 5 (September 15, 2005): 727–33. http://dx.doi.org/10.1107/s0021889805018145.

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Abstract (sommario):

The phase relations and equation of state of ZrO2were investigated up to 100 GPa by means ofin situobservation using laser heating in a diamond anvil cell and synchrotron radiation. A cotunnite (PbCl2)-type phase, which appears above 12.5 GPa, is stable to a pressure of 100 GPa and a temperature of 2500 K. No post-cotunnite phase was observed under the present experimental conditions. The unit-cell parameters and the volumes of the cotunnite-type ZrO2were determined as a function of pressure at room temperature using a laser-annealing technique. The cotunnite-type ZrO2shows rather isotropic co

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Gudat, A., R. Kniep, and J. Maier. "Ca[(Ni1−xLix)N]: limited solid solutions (0 ⩽ x ⩽ 0.58) in the system Ca[NiN] (Y[CoC]-type structure)-Ca[LiN] (modified fluorite-type structure)." Journal of Alloys and Compounds 186, no. 2 (August 1992): 339–45. http://dx.doi.org/10.1016/0925-8388(92)90021-z.

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39

GAMBARDELLA, M. T., B. DOMENGES, T. ROUILLON, M. HERVIEU та B. RAVEAU. "ChemInform Abstract: Introduction of Fluorite Layers in the 1212-Type Structure: The Oxide ( Pb0.5Sr0.5)Sr2Nd2-xCexCu2O9-δ." ChemInform 23, № 28 (21 серпня 2010): no. http://dx.doi.org/10.1002/chin.199228009.

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40

Sadykov, Vladislav, Ekaterina Sadovskaya, Nikita Eremeev, Elena Pikalova, Nina Bogdanovich, Elena Filonova, Yulia Fedorova, Alexey Krasnov, Pavel Skriabin, and Anton Lukashevich. "Design of materials for solid oxide fuel cells cathodes and oxygen separation membranes based on fundamental studies of their oxygen mobility and surface reactivity." E3S Web of Conferences 116 (2019): 00068. http://dx.doi.org/10.1051/e3sconf/201911600068.

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Abstract (sommario):

Design of materials for solid oxide fuel cells cathodes and oxygen separation membranes and studying their oxygen transport characteristics are important problems of modern hydrogen energy. In the current work, fundamentals of such materials design based on characterization of their oxygen mobility by oxygen isotope exchange with C18O2 and 18O2 in flow and closed reactors for samples of Ruddlesden – Popper-type oxides Ln2-xCaxNiO4+δ, perovskite-fluorite nanocomposites PrNi0.5Co0.5O3-δ – Ce0.9Y0.1O2-δ, etc. are presented. Fast oxygen transport was demonstrated for PNC – YDC (DO ~10-8 cm2/s at 7

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41

Kornienko, Oksana, Oleksandr Bykov, Аnatoliy Sameliuk та Olena Andrievskaya. "ISOTHERMAL SECTION STRUCTURE THE ZrO2-La2O3-Gd2O3 SYSTEM AT 1500 °С". Ukrainian Chemistry Journal 87, № 1 (19 лютого 2021): 23–40. http://dx.doi.org/10.33609/2708-129x.87.01.2021.23-40.

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Abstract (sommario):

Using the methods of physicochemical analysis (XRD, petrography, scanning electron microscopy analyses) phase equilibria were firstly investigated in the ternary system ZrO2–La2O3–Gd2O3 system at 1500 ºС. It was established that in the system there exist fields of solid solutions based on hexagonal (A) modification of La2O3 and cubic with fluorite-type structure (F) and tetragonal (Т) modification ZrО2 , cubic (С) and monoclinic (M) modification Gd2O3 and ordered intermediate phase with pyrochlore-type structure lanthanum zirconate La2Zr2O7 (Py). No new phases were found. The refined lattice p

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42

Yang, Z. J., J. Li, R. F. Linghu, X. L. Cheng, and X. D. Yang. "Optical and electronic properties of RuO2 from first principles." Canadian Journal of Physics 90, no. 5 (May 2012): 441–48. http://dx.doi.org/10.1139/p2012-038.

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Abstract (sommario):

The systematic trends of electronic structure and optical properties of RuO2 consisting of its four phases have been studied by using norm-conserving pseudopotential within the generalized gradient approximation for the exchange–correlation potential. The total density of states (DOS) and energy band structure investigations revealed that the fluorite phase possesses the broadest conduction bandwidth (0–30 eV) and the pyrite phase possesses the narrowest conduction bandwidth (0–5 eV). Study on partial DOS we found that O 2p electrons of the fluorite phase present a significant shift towards th

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43

Matovic, B., J. Dukic, A. Devecerski, S. Boskovic, M. Ninic, and Z. Dohcevic-Mitrovic. "Crystal structure analysis of Nd-doped ceria solid solutions." Science of Sintering 40, no. 1 (2008): 63–68. http://dx.doi.org/10.2298/sos0801063m.

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This paper deals with Nd-doped ceria solid solutions: Ce1-xNdxO2-d with "x" ranging from 0 to 0.25. Six different powders were synthesized by applying the method based on selfpropagating room temperature reaction (SPRT) between metallic nitrates and sodium hydroxide. The method is known to assure very precise stoichiometry of the final product in comparison with a tailored composition. Rietveld refinement was employed to get structural information on the synthesized powder. An increase of Nd ion concentration increases the unit cell parameters and average bond distances. We have shown that all

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44

Мещерских, А. Н., А. А. Кольчугин, Б. Д. Антонов та Л. А. Дунюшкина. "Фазовый состав, микроструктура и электропроводность твердых электролитов HfO_2-R-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- (R=Sc, Y, Ho, Er, Tm, Yb, Lu)". Физика твердого тела 62, № 1 (2020): 145. http://dx.doi.org/10.21883/ftt.2020.01.48752.557.

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Abstract (sommario):

The effect of the addition of 11 mol % R2O3 (R = Sc, Y, Ho, Er, Tm, Yb, Lu) on the phase and elemental composition, microstructure, and electrical conductivity of hafnium oxide was studied. When all additives, with the exception of scandium, are introduced into HfO2, solid solutions with a cubic structure such as fluorite are formed. The HfO2-Sc2O3 sample is an Hf7Sc2O17 phase having a fluorite-type lattice with rhombohedral distortions that undergoes reversible changes in the cubic structure at a temperature of ~ 760 ° C. It has been established that the nature of the dopant practically does

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45

Gnanam, S., and V. Rajendran. "Influence of Various Surfactants on Size, Morphology, and Optical Properties of CeO2 Nanostructures via Facile Hydrothermal Route." Journal of Nanoparticles 2013 (March 26, 2013): 1–6. http://dx.doi.org/10.1155/2013/839391.

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Abstract (sommario):

Different surfactants such as sodium dodecyl sulfate (SDS), polyethylene glycol (PEG), and cetyltrimethyl ammonium bromide (CTAB,) assisted cerium oxide (CeO2) nanoparticles were synthesized by using cerium chloride and potassium hydroxide as the starting materials via facile hydrothermal route. The powder X-ray diffraction (XRD) shows that cubic fluorite-type structure of pure CeO2 and the average crystallite sizes were calculated to be ~12–16 nm. Raman spectra of various surfactants assisted CeO2 consist of a single triply degenerated F2g mode characteristic of the fluorite structure. The el

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46

Zaitsev, A. N., A. R. Chakhmouradian, O. I. Siidra, J. Spratt, C. T. Williams, C. J. Stanley, S. V. Petrov, S. N. Britvin, and E. A. Polyakova. "Fluorine-, yttrium- and lanthanide-rich cerianite-(Ce) from carbonatitic rocks of the Kerimasi volcano and surrounding explosion craters, Gregory Rift, northern Tanzania." Mineralogical Magazine 75, no. 6 (December 2011): 2813–22. http://dx.doi.org/10.1180/minmag.2011.075.6.2813.

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Abstract (sommario):

AbstractCerianite-(Ce), ideally CeO2, occurs as rounded grains up to 5 μm across in a block of highly altered calcite carbonatite lava from the Kerimasi volcano, and as euhedral crystals up to 200 μm across in carbonatite-derived eluvial deposits in the Kisete and Loluni explosion craters in the Gregory Rift, northern Tanzania. X-ray powder diffraction data (a = 5.434(5) Å) and Raman spectroscopy (minor vibration modes at 184 and 571 cm—1 in addition to a strong signal at 449 cm—1) suggest the presence of essential amounts of large cations and oxygen vacancies in the Kisete material. Microprob

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47

Spinolo, G., and C. Tomasi. "Fluorite-related phases in the Bi-rich part of the Bi,Mo/O system." Powder Diffraction 12, no. 1 (March 1997): 16–19. http://dx.doi.org/10.1017/s0885715600009374.

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Abstract (sommario):

Two compounds with compositions around n=14 and n∼5.4 (n=Bi/Mo molar ratio) have been prepared by solid-state reaction with five heating/grinding cycles at 800 °C. The lattice constants of both compounds can be related to the fluorite-type structure of δ-Bi2O3. Bi14MoO24 has been indexed as an orthorhombic pseudotetragonal (√2×√2×1) superstructure: a=7.812 (±0.005) Å, b=7.762 (±0.005) Å, c=5.7716 (±0.0007) Å (but a+b=15.5750±0.0020). For orthorhombic (3×5×3) Bi38Mo7O78: a=16.8236 (±0.0027) Å, b=28.6182 (±0.0045) Å, c=16.9082 (±0.0027) Å.

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48

SONI, B., and S. BISWAS. "CERIA NANOPARTICLES SYNTHESIZED BY A POLYMER PRECURSOR METHOD." International Journal of Modern Physics: Conference Series 22 (January 2013): 169–72. http://dx.doi.org/10.1142/s2010194513010076.

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Abstract (sommario):

We report a novel synthesis technique of ceria nanoparticles by a sol-gel type chemical process using poly-vinyl alcohol (PVA) as a capping as well as a reducing agent. The as-synthesized CeO 2 nanoparticles were characterized by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). The XRD analysis reveals the fluorite type face centered cubic structure in the ceria nanoparticles with an average crystallite size of 6 nm and 9 nm for the samples calcined at 350°C and 400°C, respectively.

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49

Jucha, S., G. Moskal, and M. Mikuśkiewicz. "Synthesis and Characterization of Thermal Properties of Type Eu2O3-ZrO2 Sinters." Archives of Metallurgy and Materials 61, no. 2 (June 1, 2016): 1121–28. http://dx.doi.org/10.1515/amm-2016-0188.

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Abstract The oxides with pyrochlore or defected fluorite structure are a potential alternative ceramic materials for now widely used yttria-stabilized zirconia 8YSZ in the application for the insulation layer of thermal barrier coatings systems. This paper presents a procedure of synthesis of europium zirconate of Eu2Zr2O7 type, by the method of high temperature sintering under pressure. The analysis of the effect of the powders` homogenization methods on homogeneity of final sintered material showed that the highest homogeneity can be obtained after mechanical mixing in alcohol. Moreover, the

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50

Slobodyuk, A. B., V. Ya Kavun, N. F. Uvarov, E. B. Merkulov, and M. M. Polyantsev. "NMR and complex impedance study of ionic motion in new Rb0.4Bi0.6–In F2.2 solid solutions with fluorite-type structure." Solid State Ionics 360 (February 2021): 115545. http://dx.doi.org/10.1016/j.ssi.2020.115545.

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