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Artykuły w czasopismach na temat „Fluorite structure”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Grzechnik, Andrzej, and Karen Friese. "Fluorides containing lanthanides and yttrium at extreme conditions." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C55. http://dx.doi.org/10.1107/s2053273314099446.

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We are interested in crystal structures and stabilities of fluoride materials containing lanthanides and yttrium that are related to the CaF2 structure. These compounds are laser hosts and luminescent materials, oxygen sensors as well as components of solar cells. They exhibit various schemes of (dis)ordering of cations and anions in fluorite superstructures and anion-excess fluorites. In the last few years, we have performed a series of studies on the bulk AMF4 and MF3 materials (A = Li, Na, K; M = Y, lanthanide) at different pressure-temperature conditions. Among them, ordered LiYF4 is a com

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2

Hirakawa, Saya, Keiji Shimoda, Shogo Kawaguchi, Yuki Orikasa, and Chengchao Zhong. "Fluoride Ion Conductivity and Crystal Structure Analysis of Ba₄Bi₃F₁₇ with Fluorite-Type Units." ECS Meeting Abstracts MA2024-02, no. 48 (2024): 3482. https://doi.org/10.1149/ma2024-02483482mtgabs.

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All-solid-state fluoride ion batteries are attracting attention as an innovative next-generation battery that can replace lithium-ion batteries due to their high energy density. For fluoride ion conductor, three main types of crystal structures have been reported: fluorite-type, tysonite-type, and perovskite-type. Among these, fluoride ionic conductors with fluorite-type structure show the best conductivity. In fluorite-type BaF2, 4-coordinated fluoride ions are difficult to move within the crystal structure, and it has been reported that the addition of La3+ with different valence improves co

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3

Mineshige, Atsushi, and Maiko Sugiura. "Highly Conductive Solid Electrolytes for Fluoride Battery Application." ECS Meeting Abstracts MA2023-01, no. 7 (2023): 2871. http://dx.doi.org/10.1149/ma2023-0172871mtgabs.

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Recently, fluoride batteries are attracting attention as electrochemical high-energy-density storage devices. There are various types of fluoride ion conductors such as fluorite-type, tysonite-type, and fluorite-related-type and so on. Among them, MSnF4-type fluorides (M: Pb, Ba) have high ion conductivity, and are good candidates for electrolyte materials to be used in fluoride batteries. Up to now, the highest conductivity among fluoride ion conductors was obtained for PbSnF4 with the fluorite-related-type structure, exhibiting pure and high ion conductivity of 2x10-2 S cm-1 at room temperat

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4

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

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5

Ge, Xiao, Qingfeng Guo, Qianqian Wang, Tao Li, and Libing Liao. "Mineralogical Characteristics and Luminescent Properties of Natural Fluorite with Three Different Colors." Materials 15, no. 6 (2022): 1983. http://dx.doi.org/10.3390/ma15061983.

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Fluorite is rich in mineral resources and its gorgeous colors and excellent luminescence characteristics have attracted the attention of many scholars. In this paper, the composition, structure, luminescent properties, and the potential application value of three fluorites with different colors and are systematically analyzed. The results show that REE and radioactive elements have effects on the structure, color, and luminescence of fluorite. Radioactive elements Th and U will aggravate the formation of crystal defects in fluorite. The green color is related to Ce3+ and Sm2+. Colloidal calciu

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6

Liu, Yang, Qingfeng Guo, Liangyu Liu, Sixue Zhang, Qingling Li, and Libing Liao. "Comparative Study on Gemological and Mineralogical Characteristics and Coloration Mechanism of Four Color Types of Fluorite." Crystals 13, no. 1 (2023): 75. http://dx.doi.org/10.3390/cryst13010075.

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Fluorite has been attracting the attention of gemstone mineralogists because of its rich color and excellent fluorescence properties. This paper studied fluorite with three color types (blue, green, and white) and five blue-purple fluorites with an alexandrite effect. Through the study of their structure, composition, and spectral characteristics, the gemological and mineralogical characteristics and coloration mechanisms of different color types of fluorites are compared and analyzed. The results show that the color of fluorite is caused by multiple color centers. Blue fluorite is associated

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7

Oura, Honoka, Shintaro Tachibana, Shinziro Hirai, Yuki Orikasa, and Chengchao Zhong. "Fluoride Ion Conductor of Fluorosulfide with Double-Layer Honeycomb Structure." ECS Meeting Abstracts MA2024-02, no. 67 (2024): 4647. https://doi.org/10.1149/ma2024-02674647mtgabs.

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All-solid-state fluoride ion batteries (FIBs) have attracted considerable attention due to their high theoretical energy density and high safety compared with those of conventional lithium-ion batteries (LIBs) [1]. However, the practical application of FIB lacks suitable solid electrolyte with high ionic conductivity and wide electrochemical potential window at room temperature. In addition, most of the fluoride ionic conductors reported previously are limited to fluorides such as fluorite, tysonite-type, and perovskite-type structures [2]. Therefore, increasing the variations of crystal struc

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8

Park, Min Hyuk, and Cheol Seong Hwang. "Fluorite-structure antiferroelectrics." Reports on Progress in Physics 82, no. 12 (2019): 124502. http://dx.doi.org/10.1088/1361-6633/ab49d6.

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9

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 (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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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 (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

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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12

Cai, Lu, and Juan C. Nino. "Complex ceramic structures. I. Weberites." Acta Crystallographica Section B Structural Science 65, no. 3 (2009): 269–90. http://dx.doi.org/10.1107/s0108768109011355.

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The weberite structure (A 2 B 2 X 7) is an anion-deficient fluorite-related superstructure. Compared with fluorites, the reduction in the number of anions leads to a decrease in the coordination number of the B cations (VI coordination) with respect to the A cations (VIII coordination), thus allowing the accommodation of diverse cations. As a result, weberite compounds have a broad range of chemical and physical properties and great technological potential. This article summarizes the structural features of weberite and describes the structure in several different ways. This is the first time

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13

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 (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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14

Sorokin N. I. and Karimov D. N. "Mechanism of electrotransport in superionic conductor Sr-=SUB=-0.7-=/SUB=-La-=SUB=-0.15-=/SUB=-Lu-=SUB=-0.15-=/SUB=-F-=SUB=-2.3-=/SUB=- with the fluorite-type structure." Physics of the Solid State 65, no. 1 (2023): 84. http://dx.doi.org/10.21883/pss.2023.01.54979.467.

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The ionic conductivity of the superionic conductor Sr0.7La0.15Lu0.15F2.3 with the fluorite-type structure (type CaF2, sp. gr. Fm3m) had measured by the impedance spectroscopy in the temperature range 385-794 K. Bulk crystals of a three-component solid solution (lattice parameter a=5.7726(1) Angstrem) had obtained from the melt by the directed crystallization technique. Temperature dependence ionic conductivity sigmadc(T) satisfies the Arrhenius--Frenkel equation with the activation enthalpy of the electrical conductivity Delta Hsigma=0.706± 0.05 eV. The value of sigmadc is 1.5·10-5 S/cm at 500

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15

Fedorov, Pavel P., and Irina I. Buchinskaya. "Sodium fluoride and rare earth trifluorides systems. Review." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 26, no. 4 (2024): 687–705. https://doi.org/10.17308/kcmf.2024.26/12415.

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NaF–RF3 systems, which are composed of sodium fluorides and rare earth trifluorides, are sources of many functional materials. Data on phase formation and phase equilibria in these systems were analyzed. The polymorphism and morphotropy of rare earth fluorides were considered taking into account the influence of pyrohydrolysis. A summary series of NaF–RF3 phase diagrams are presented and the coordinates of invariant equilibria are tabulated. The data of research by Thoma et al., performed in the sixties of the twentieth century, are now only of historical interest. In these systems, a-Na0.5–xR

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16

Fedorov, Pavel P., Angelina A. Volchek, Valery V. Voronov, Alexander A. Alexandrov, and Sergey V. Kuznetsov. "Stabilization of the Ba4Y3F17 phase in the NaF-BaF2-YF3 system." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 26, no. 2 (2024): 314–20. http://dx.doi.org/10.17308/kcmf.2024.26/11942.

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The paper describes the study of the phase formation in the NaF-BaF2-YF3 system. It involved solid-phase sintering of the components in a fluorinating atmosphere at 750 °C for two weeks and quenching them in liquid nitrogen. The prepared samples were placed in nickel capillaries, which, together with barium hydrofluoride, BaF2·HF, were placed in copper containers. The containers were sealed by argon arc welding. The fluorinating atmosphere was created by pyrolysis of barium hydrofluoride, BaF2·HF. X-ray powder diffraction was carried out using a Bruker D8 Advanced diffractometer (CuKa‑radiatio

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17

Sorokin, N. I. "Superionic transport in solid fluoride solutions with a fluorite structure." Russian Journal of Electrochemistry 42, no. 7 (2006): 744–59. http://dx.doi.org/10.1134/s1023193506070081.

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18

Kulikov, Boris P., Natalia V. Vasyunina, Irina V. Dubova, Alexander S. Samoilo, Irina K. Ivanova, and Yana S. Sysoeva. "PRODUCTION OF FLUORINE-CONTAINING MINERALIZER FOR CLINKER BURNING USING COAL FOAM AND FLY ASH FROM BEREZOVSKAYA GRES." ChemChemTech 68, no. 6 (2025): 92–105. https://doi.org/10.6060/ivkkt.20256806.7174.

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The article presents the results of studies of the composition, structure and properties of fly ash from Berezovskaya GRES-1 (Krasnoyarsk Krai), and presents the results of studies on the use of fly ash as a lime-containing reagent in the production of synthetic fluorite by causticization of electrolytic carbon foam from aluminum production. Samples of fly ash from Berezovskaya GRES-1, fluorine-containing industrial products from aluminum production, and synthetic fluorite obtained from them were analyzed using a number of methods: X-ray phase analysis (XRD); X-ray spectral analysis (XRS); sca

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19

Wang, Hong, and Xi Yao. "Structure and dielectric properties of pyrochlore–fluorite biphase ceramics in the Bi2O3–ZnO–Nb2O5 system." Journal of Materials Research 16, no. 1 (2001): 83–87. http://dx.doi.org/10.1557/jmr.2001.0016.

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The structure and dielectric properties of Bi2O3–ZnO–Nb2O5-based ceramics with pyrochlore–fluorite biphase structure were investigated. Mixed-sintered ceramics were prepared by two precalcined constituents in the system of x[Bi1.5Zn0.5(Zn0.5Nb1.5)O7]−(1 − x)Bi3/4Nb1/4O7/4 (0.05 ≤ x ≤ 0.35), where Bi1.5Zn0.5(Zn0.5Nb1.5)O7 is a cubic pyrochlore (α) and Bi3/4Nb1/4O7/4 is a defect cubic fluorite (F). The phase composition of the mixed-sintered ceramics were characterized as a biphasic structure with a distorted pyrochlore (β) and a fluorite (F) coexisting. The phase ratio of β pyrochlore and F flu

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20

Fu, Zhi Jian, Li Jun Jia, and Wei Long Quan. "Phase Transition and ThermodynamicProperties of OsN₂under High Pressure." Applied Mechanics and Materials 401-403 (September 2013): 660–62. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.660.

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The lattice parameters, phase transition, and thermodynamic properties of OsN2in pyrite and fluorite structure are investigated by first-principles calculations. The pressure and temperature induced phase transitions of OsN2from fluorite structure to pyrite structure have been obtained. It is found that the transition pressure of OsN2at zero temperature is 158.2 GPa, and there exists no transition temperature. In addition, the thermal expansion, the Debye temperature, and the Grüneisen parameter in diverse pressures and temperatures about these two structures have also been obtained. Key word

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21

Karpukhina, Natalia, Robert V. Law, and Robert G. Hill. "Solid State NMR Study of Calcium Fluoroaluminosilicate Glasses." Advanced Materials Research 39-40 (April 2008): 25–30. http://dx.doi.org/10.4028/www.scientific.net/amr.39-40.25.

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Fluorine containing calcium aluminosilicate glasses are widely used for a number of technological applications including dental cements, mould fluxes in steel making and in a variety of glass-ceramic systems. Despite of their importance these systems remain quite poorly understood with respect to their composition. To address this question a glass composition corresponding to the equimolar binary system anorthite−fluorite (Ca2Al2Si2O8−CaF2) was chosen as a base point for two series of compositions. One of the series is designed on the anorthite stoichiometry and considered as classically charg

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22

Tripathi, Vikash Kumar, and Rajamani Nagarajan. "Determination of solubility limit of Sn4+in fluorite structured terbia with simultaneous evaluation of photocatalytic function." Dalton Transactions 45, no. 27 (2016): 11191–97. http://dx.doi.org/10.1039/c6dt01372d.

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23

Yu, R., and X. F. Zhang. "Platinum nitride with fluorite structure." Applied Physics Letters 86, no. 12 (2005): 121913. http://dx.doi.org/10.1063/1.1890466.

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24

LIANG, YONGCHENG, ANHU LI, and QIUHONG SONG. "STRUCTURAL PHASE TRANSITIONS AND MECHANICAL PROPERTIES OF OsO2 UNDER HIGH PRESSURE." International Journal of Modern Physics B 24, no. 22 (2010): 4269–79. http://dx.doi.org/10.1142/s0217979210055901.

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The structural phase transitions, mechanical properties and electronic structures of OsO 2 under high pressure are systemically investigated by the first-principles plane-wave basis pseudopotential calculations. The possible pressure-induced transition sequence in OsO 2 may be the rutile, pyrite and fluorite phases, and the stable CaCl 2 structure is not found. The fluorite phase has high bulk modulus (355.3 GPa), large shear modulus G (267.9 GPa), and huge elastic constant C44 (292.7 GPa), and consequently is an excellent candidate of superhard materials. Crystal structures, valence electron

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25

Blednov, A. V., O. Yu Gorbenko, A. R. Kaul, S. V. Samoilenkov, R. Yu Muydinov, and A. V. Garshev. "Solid-phase epitaxy of alkali-earth fluorides with fluorite structure." Doklady Chemistry 428, no. 1 (2009): 213–17. http://dx.doi.org/10.1134/s0012500809090031.

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26

Bohigas, X., A. Folch, J. Tejada, N. I. Sorokin, and B. P. Sobolev. "Paramagnetic Susceptibility of Nonstoichiometric Fluorides with the Fluorite-Type Structure." Journal of Solid State Chemistry 102, no. 1 (1993): 198–203. http://dx.doi.org/10.1006/jssc.1993.1022.

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Pattanathummasid, Chanachai, Kazuki Tani, Toshiyuki Matsunaga, and Tsuyoshi Takami. "(General Student Poster Award Winner, 1st Place) Synthesis and F-Ion Conduction of Ba_0.57M_0.43F_2.43 (M = Y, La, Nd, Sm, Bi) As Solid Electrolytes for All-Solid-State F-Ion Batteries." ECS Meeting Abstracts MA2024-02, no. 67 (2024): 4511. https://doi.org/10.1149/ma2024-02674511mtgabs.

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All-solid-state fluoride-ion batteries (FIBs) have attracted research attention because these batteries possess a high energy density surpassing the state-of-the-art Li-ion batteries.1 Yet, the lack of a fluoride-ion conductor with both highly ionic conductive and highly stable is one of the key bottlenecks in the development of FIBs. Conventionally, La0.9Ba0.1F2.9 (LBF) is used as a solid electrolyte in FIB. However, the cathodic stability of LBF limits the choice of anode materials unable to be below the reduction potential of LaF3/La as plating occurs. Our previous study showed that Ba4Bi3F

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Popov, P. A., P. P. Fedorov, and V. V. Osiko. "Thermal conductivity of single crystals with a fluorite structure: Cadmium fluoride." Physics of the Solid State 52, no. 3 (2010): 504–8. http://dx.doi.org/10.1134/s1063783410030091.

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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 (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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30

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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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 (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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Zakalyukin, R. M., E. A. Levkevich та A. V. Nikolaeva. "Synthesis and X-ray-graphical characteristics of the MеSn<sub>2</sub>F<sub>5</sub> (Mе = Na, K, Rb, Cs) fluoride-ion conductors". Fine Chemical Technologies 16, № 5 (2021): 426–37. http://dx.doi.org/10.32362/2410-6593-2021-16-5-426-437.

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Objectives. Pentafluorodistannates of alkali metals are promising materials for use as electrolytes in fluoride-ion batteries due to their electrophysical properties, such as high fluoride-ion conductivity. This work aims to synthesize crystals of alkali metals MeSn2F5 (Me = Na, K, Rb, Cs), carry out X-ray diffraction studies on them, and investigate the possibility of obtaining lithium fluorostannates.Methods. Supersaturated aqueous solutions were employed to synthesize the crystals. The X-ray diffraction (XRD) analysis was carried out.Results. Oversaturated solutions yield microcrystalline p

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He, Yu, Kaige Liu, Bingxi Xiang, et al. "An overview on transparent ceramics with pyrochlore and fluorite structures." Journal of Advanced Dielectrics 10, no. 03 (2020): 2030001. http://dx.doi.org/10.1142/s2010135x20300017.

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Transparent ceramics have potential applications in various areas, including aerospace, relativistic optics industries, medical cares and defense. Specifically, they can be used as laser gain media, armor windows, IR domes, solid-state phosphors, scintillators and electro-optical components. From crystal structure point of view, transparent ceramic materials should have high crystallographic symmetries (cubic, tetragonal and hexagonal), which have minimal birefringent effect. Currently, transparent ceramics are dominantly based on oxide materials, although there are also nonoxides, such as flu

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Kulikov, B. P., N. V. Vasyunina, I. V. Dubova, A. S. Samoylo, A. S. Kutovaya, and R. O. Balanev. "Processing the Fluorocarbon-containing Waste from Electrolytic Aluminum Production." Ecology and Industry of Russia 28, no. 6 (2024): 4–9. http://dx.doi.org/10.18412/1816-0395-2024-6-4-9.

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The characteristics of fine fluorocarbon-containing waste from aluminum production are given and the influence of changes in aluminum production technology that have occurred in recent years on the formation structure, composition and properties is analyzed. The currently proposed methods for processing these wastes are reviewed. An assessment of the method for processing fine fluorocarbon-containing waste from aluminum production was carried out on the example of coal foam flotation tailings using the method of causticization with lime milk to produce a product containing synthetic fluorite,

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Gidado Shehu and Ibrahim Muhammad Bagudo. "Mineralogical and Structural Analyses of Natural Fluorite from Yantuwaru Mining Site, Nigeria." UMYU Scientifica 2, no. 1 (2023): 43–51. http://dx.doi.org/10.56919/usci.2123.007.

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Experimental studies of natural fluorite have been reported. In this study, combined X-Ray Fluorescence, FTIR and UV-Vis analyses were performed to give mineralogical information about natural fluorspar. The X-ray diffraction technique was also used to determine the crystallographic parameters and structure of the mineral. Results show a variation of Ca contents and low concentration of F, through all fluorite samples due to Ba and Br contents in the samples, causing replacements of impurity ions in the fluorite lattice. REEs in the fluorite samples were to be found responsible for colour. UV-

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Ye, Fei, Ding Rong Ou, and Toshiyuki Mori. "Microstructural Evolution in a CeO2-Gd2O3 System." Microscopy and Microanalysis 18, no. 1 (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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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 (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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Buchinskaya, Irina I., Natalia A. Arkharova, Anna G. Ivanova, Nikolay I. Sorokin, and Denis N. Karimov. "Synthesis, Microstructure, and Electrical Conductivity of Eutectic Composites in MF2–RF3 (M = Ca, Sr, Ba; R = La–Nd) Systems." Journal of Composites Science 7, no. 8 (2023): 330. http://dx.doi.org/10.3390/jcs7080330.

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Multiphase fluoride polycrystalline eutectics pRF3 × qMF2 forming in the MF2–RF3 (M = Ca, Sr, Ba; R = La–Nd) binary systems were synthesized by the directional crystallization technique from a melt. The phase composition, morphology, and temperature dependences of fluorine ionic conductivity in fabricated composites were studied in detail. The pRF3 × qMF2 (p and q are the mole percentages of components) eutectic composites consist of both extremely saturated fluorite-type structure M1−xRxF2+x solid solutions and the tysonite-type R1−yMyF3−y ones. Microsized growth blocks with a fine lamellar s

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Yamada, Koji, Yasumasa Ohnuki, Hiroshi Ohki, and Tsutomu Okuda. "New Anionic Conductor KSbF4with Fluorite Structure." Chemistry Letters 28, no. 7 (1999): 627–28. http://dx.doi.org/10.1246/cl.1999.627.

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Evarestov, R. A., I. V. Murin, and A. V. Petrov. "Electronic structure of fluorite-type crystals." Journal of Physics: Condensed Matter 1, no. 37 (1989): 6603–9. http://dx.doi.org/10.1088/0953-8984/1/37/008.

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Mishra, C. N., R. P. Goyal, S. C. Goyal, and B. R. K. Gupta. "Thermodynamical properties of fluorite structure crystals." Infrared Physics & Technology 35, no. 1 (1994): 63–66. http://dx.doi.org/10.1016/1350-4495(94)90043-4.

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von Känel, H., R. Stalder, H. Sirringhaus, N. Onda, and J. Henz. "Epitaxial silicides with the fluorite structure." Applied Surface Science 53 (November 1991): 196–205. http://dx.doi.org/10.1016/0169-4332(91)90263-j.

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Shein, I. R., and A. L. Ivanovskii. "Electronic Structure of Fluorite-Like TiF2." physica status solidi (b) 157, no. 1 (1990): K29—K32. http://dx.doi.org/10.1002/pssb.2221570154.

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Köhler, J., A. K. Tyagi, and S. N. Achary. "Crystal structure of lead yttrium fluoride, Pb8Y6F34, a new fluorite-related anion-rich fluoride." Zeitschrift für Kristallographie - New Crystal Structures 217, JG (2002): 23. http://dx.doi.org/10.1524/ncrs.2002.217.jg.23.

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Köhler, J., A. K. Tyagi, and S. N. Achary. "Crystal structure of lead yttrium fluoride, Pb8Y6F34, a new fluorite-related anion-rich fluoride." Zeitschrift für Kristallographie - New Crystal Structures 217, no. 1 (2002): 23. http://dx.doi.org/10.1524/ncrs.2002.217.1.23.

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Zhang, Rui, Qiang Xu, Wei Pan, Chun Lei Wan, Long Hao Qi, and He Zhuo Miao. "Structure and Ionic Conductivity of Ln₂Zr₂O₇-Type Rare Earth Zirconates." Key Engineering Materials 336-338 (April 2007): 420–23. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.420.

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Three rare earth zirconates (Sm2Zr2O7, Gd2Zr2O7 and Er2Zr2O7) were prepared by solid state reaction. The crystal structure and ionic conductivity of these zirconates were characterized by X-ray diffraction (XRD) and complex impedance spectroscopy. The results show that Sm2Zr2O7 exhibits single-phase pyrochlore structure and Er2Zr2O7 exhibits single-phase fluorite structure, while Gd2Zr2O7 has pyrochlore and fluorite structure. Among three zirconates, the ionic conductivity of Sm2Zr2O7 is highest, while that of Er2Zr2O7 is lowest.

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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 (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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Ge, Ni-Na, Yong-Kai Wei, Jia-Jin Tan, Guang-Fu Ji, and Yan Cheng. "Physical properties of osmium dinitride with fluorite, pyrite, marcasite, and monoclinic structures under high pressure: First-principles study." Canadian Journal of Physics 93, no. 4 (2015): 424–33. http://dx.doi.org/10.1139/cjp-2014-0228.

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The structure, phase transition, elastic, and thermodynamic properties of OsN2 have been studied via first-principles calculations. It is shown that the CoSb2 structure is more stable than other structures. By the calculated H-P relations at 0 K, we found that the phase transition of OsN2 from CoSb2 structure to marcasite structure (ε → δ) occurs at 16.8 GPa, while the phase transition pressure between pyrite structure and fluorite structure (γ → α) is 80 GPa. The results of obtained phase transitions are also confirmed by bond length, sound velocity, and thermal expansion coefficient under di

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Guan Li, Liu Bao-Ting, Li Xu, et al. "Electronic structure and optical properties of fluorite-structure TiO2." Acta Physica Sinica 57, no. 1 (2008): 482. http://dx.doi.org/10.7498/aps.57.482.

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Lambrecht, Walter R. L., Niels E. Christensen, and Peter Blöchl. "Electronic structure and properties ofNiSi2andCoSi2in the fluorite and adamantane structures." Physical Review B 36, no. 5 (1987): 2493–503. http://dx.doi.org/10.1103/physrevb.36.2493.

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