Log in

Relevant bibliographies by topics / Yttrium fluorure / Journal articles

To see the other types of publications on this topic, follow the link: Yttrium fluorure.

Journal articles on the topic 'Yttrium fluorure'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Yttrium fluorure.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Park, Seung Hyun, Kyung Eon Kim, and Sang Jeen Hong. "Surface Analysis of Chamber Coating Materials Exposed to CF4/O2 Plasma." Coatings 11, no. 1 (January 18, 2021): 105. http://dx.doi.org/10.3390/coatings11010105.

Full text

Abstract:

Coating the inner surfaces of high-powered plasma processing equipment has become crucial for reducing maintenance costs, process drift, and contaminants. The conventionally preferred alumina (Al2O3) coating has been replaced with yttria (Y2O3) due to the long-standing endurance achieved by fluorine-based etching; however, the continuous increase in radio frequency (RF) power necessitates the use of alternative coating materials to reduce process shift in a series of high-powered semiconductor manufacturing environments. In this study, we investigated the fluorine-based etching resistance of atmospheric pressure-sprayed alumina, yttria, yttrium aluminum garnet (YAG), and yttrium oxyfluoride (YOF). The prepared ceramic-coated samples were directly exposed to silicon oxide etching, and the surfaces of the plasma-exposed samples were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. We found that an ideal coating material must demonstrate high plasma-induced structure distortion by the fluorine atom from the radical. For endurance to fluorine-based plasma exposure, the bonding structure with fluoride was shown to be more effective than oxide-based ceramics. Thus, fluoride-based ceramic materials can be promising candidates for chamber coating materials.

APA, Harvard, Vancouver, ISO, and other styles

2

Grzechnik, Andrzej, and Karen Friese. "Fluorides containing lanthanides and yttrium at extreme conditions." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C55. http://dx.doi.org/10.1107/s2053273314099446.

Full text

Abstract:

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 commercial host for solid state lasers, while partially ordered NaYF4 doped with lanthanides is the most efficient material for green and blue up-conversion known to date. In the system KF–YF3, we have studied not only KYF4 [1] but also KY3F10, which is an anion-excess 2×2×2 superstructure of fluorite at atmospheric conditions. At high temperatures and high pressures, it converts to another fluorite superstructure with disordered fluorine atoms. The pressure-induced LaF3 post-tysonite structure is another example of the anion-excess fluorite [2]. Our work on the fluorite-related materials at extreme conditions provides information on their structural instabilities that could further be used to better understand and control their materials properties. For instance, we demonstrated that the NaMF4 up-converters are unstable and that the ordering of the cations and vacancies in their structure is a slow process [3]. Consequently, the order–disorder transformations have a profound influence over the luminescent properties of these materials when doped.

APA, Harvard, Vancouver, ISO, and other styles

3

He, Xianghong, and Bing Yan. "Yttrium hydroxide fluoride based monodisperse mesocrystals: additive-free synthesis, enhanced fluorescence properties, and potential applications in temperature sensing." CrystEngComm 17, no. 3 (2015): 621–27. http://dx.doi.org/10.1039/c4ce01823k.

Full text

Abstract:

Fluorine-containing monodisperse mesocrystals constructed by nanorods were synthesized via an additive-free hydrothermal route and Eu³⁺ was successfully incorporated into the yttrium hydroxide fluoride host lattice.

APA, Harvard, Vancouver, ISO, and other styles

4

He, Xianghong, Yaheng Zhang, Yu Fu, Ning Lian, and Zhongchun Li. "A Polyol-Mediated Fluoride Ions Slow-Releasing Strategy for the Phase-Controlled Synthesis of Photofunctional Mesocrystals." Nanomaterials 9, no. 1 (December 26, 2018): 28. http://dx.doi.org/10.3390/nano9010028.

Full text

Abstract:

There are only a few inorganic compounds that have evoked as much interest as sodium yttrium fluoride (NaYF4). Its extensive applications in various fields, including transparent displays, luminescence coding, data storage, as well as biological imaging, demand the precise tuning of the crystal phase. Controlling the emergence of the desired α-phase has so far remained a formidable challenge, especially via a simple procedure. Herein, we represented a polyol-assisted fluoride ions slow-release strategy for the rational control of pure cubic phase NaYF4 mesocrystals. The combination of fluorine-containing ionic liquid as a fluoride source and the existence of a polyalcohol as the reactive medium ensure the formation of uniform α-phase mesocrystallines in spite of a higher temperature and/or higher doping level.

APA, Harvard, Vancouver, ISO, and other styles

5

Stefanski, Johannes, and Sandro Jahn. "Yttrium speciation in subduction-zone fluids from ab initio molecular dynamics simulations." Solid Earth 11, no. 3 (May 5, 2020): 767–89. http://dx.doi.org/10.5194/se-11-767-2020.

Full text

Abstract:

Abstract. The rare Earth elements (REEs) are important geochemical tracers for geological processes such as high-grade metamorphism. Aqueous fluids are considered important carriers for the REEs in a variety of geological environments including settings associated with subduction zones. The capacity of a fluid to mobilize REEs strongly depends on its chemical composition and on the presence of suitable ligands such as fluoride and chloride. In this study, we present structural and thermodynamic properties of aqueous yttrium–chloride and yttrium–fluoride species at a temperature of 800 ∘C in a pressure range between 1.3 and 4.5 GPa derived from ab initio molecular dynamics simulations. The total yttrium coordination by H2O and halide ions changes from seven to eight within the pressure range. For the yttrium–chloride species, a maximum number of three chloride ligands was observed. The derived thermodynamic data show that aqueous yttrium–fluoride complexes are more stable than their yttrium–chloride counterparts in chloride- and fluoride-rich environments at conditions relevant to slab dehydration. Mixed Y(Cl,F) complexes are found to be unstable even on the molecular dynamics timescale. Furthermore, in contrast to field observations, thermodynamic modeling indicates that yttrium should be mobilized at rather low fluoride concentrations in high-grade metasomatic systems. These results suggest a rather low fluoride activity in the majority of subduction-zone fluids because yttrium is one of the least-mobile REEs. Additionally, the simulations indicate that yttrium drives the self-ionization of hydration water molecules as it was observed for other high-field-strength elements. This might be a general property for highly charged cations in aqueous solutions under high-temperature and high-pressure conditions.

APA, Harvard, Vancouver, ISO, and other styles

6

Wang, Wei-Kai, Yu-Xiu Lin, and Yi-Jie Xu. "Structural and Fluorine Plasma Etching Behavior of Sputter-Deposition Yttrium Fluoride Film." Nanomaterials 8, no. 11 (November 14, 2018): 936. http://dx.doi.org/10.3390/nano8110936.

Full text

Abstract:

Yttrium fluoride (YF3) films were grown on sapphire substrate by a radio frequency magnetron using a commercial ceramic target in a vacuum chamber. The structure, composition, and plasma etching behavior of the films were systematically investigated. The YF3 film was deposited at a working pressure of 5 mTorr and an RF power of 150 W. The substrate-heating temperature was increased from 400 to 700 °C in increments of 100 °C. High-resolution transmission electron microscopy (HRTEM) and X-ray diffraction results confirmed an orthorhombic YF3 structure was obtained at a substrate temperature of 700 °C for 2 h. X-ray photoelectron spectroscopy revealed a strongly fluorinated bond (Y–F bond) on the etched surface of the YF3 films. HRTEM analysis also revealed that the YF3 films became yttrium-oxyfluorinated after exposure to fluorocarbon plasma. The etching depth was three times lower on YF3 film than on Al2O3 plate. These results showed that the YF3 films have excellent erosion resistance properties compared to Al2O3 plates.

APA, Harvard, Vancouver, ISO, and other styles

7

Wang, Xiu Hui, Jia Tai Dong, Ye Cao, Guo Quan Zhao, Hong Gao, and Jin Long Yang. "Influences of Process Parameters on the Forming of YAG Phase." Applied Mechanics and Materials 164 (April 2012): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amm.164.65.

Full text

Abstract:

Submicron single-phase yttrium aluminum garnet (Y3Al5O12, YAG) powders were fabricated by solid-state reactive heat-treating a mixture of pyrolysis product, heat-treating isopropyl aluminum at 500°C, and yttria (Y2O3) powders. The powders were mixed by ball milling for 2~3 h doped with 5wt% aluminium fluoride (AlF3), and then heat-treated at 1200°C for 2~5 h. Characterized by XRD, mixing the powders by ball milling and doped with AlF3 lowered the heat-treating temperature and made the forming of YAG phase be single.

APA, Harvard, Vancouver, ISO, and other styles

8

Tian, Li, Jin Liu, Fei Yu Chen, and Qi Liang Sun. "Hexagonal NaYF₄ Nanotube Arrays Obtained via Solvothermal Process." Advanced Materials Research 554-556 (July 2012): 667–70. http://dx.doi.org/10.4028/www.scientific.net/amr.554-556.667.

Full text

Abstract:

Hexagonal sodium yttrium fluoride has been successfully synthesized via a facile solvothermal route, using yttrium nitrate, sodium fluoride and polyethanediol as raw materials to react in propanetriol solvent. The as-prepared product was characterized by powder X-ray diffraction, scanning electron microscopy, thermogravimetric and differential thermal analysis, Fourier transform infrared spectrum and energy dispersive X-ray spectrum. The characterization results revealed that the products are hexagonal and denoted as NaYF4. The as-synthesized hexagonal sodium yttrium fluoride composed of hollow-structured nanotubes self-assembled and arrayed orientedly to take on bamboo raft morphology. Hexagonal NaYF4 nanotube arrays exhibited high heat stability. This study provides a simple method to prepare bamboo raft-shaped NaYF4 in large scale, which broads their practical applications.

APA, Harvard, Vancouver, ISO, and other styles

9

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 (December 2002): 23. http://dx.doi.org/10.1524/ncrs.2002.217.jg.23.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

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 (December 1, 2002): 23. http://dx.doi.org/10.1524/ncrs.2002.217.1.23.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Winiarz, Piotr, Aleksandra Mielewczyk-Gryń, Kristina Lilova, Sebastian Wachowski, Tamilarasan Subramani, Mykola Abramchuk, Ewa Dzik, Alexandra Navrotsky, and Maria Gazda. "Conductivity, structure, and thermodynamics of Y2Ti2O7–Y3NbO7 solid solutions." Dalton Transactions 49, no. 31 (2020): 10839–50. http://dx.doi.org/10.1039/d0dt02156c.

Full text

Abstract:

Defect fluorite yttrium niobate Y₃NbO₇ and pyrochlore yttrium titanate Y₂Ti₂O₇ solid solutions are single-phase oxygen ion- and proton-conducting materials.

APA, Harvard, Vancouver, ISO, and other styles

12

Chun Li, Chun Li, Yuxin Leng Yuxin Leng, and Jinjin Huo Jinjin Huo. "ReSe2 as a saturable absorber in a Tm-doped yttrium lithium fluoride (Tm:YLF) pulse laser." Chinese Optics Letters 17, no. 1 (2019): 011402. http://dx.doi.org/10.3788/col201917.011402.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Mehta, Rahul, Kejia Cai, Nishant Kumar, M. Grace Knuttinen, Thomas M. Anderson, Hui Lu, and Yang Lu. "A Lesion-Based Response Prediction Model Using Pretherapy PET/CT Image Features for Y90 Radioembolization to Hepatic Malignancies." Technology in Cancer Research & Treatment 16, no. 5 (September 6, 2016): 620–29. http://dx.doi.org/10.1177/1533034616666721.

Full text

Abstract:

We present a probabilistic approach to identify patients with primary and secondary hepatic malignancies as responders or nonresponders to yttrium-90 radioembolization therapy. Recent advances in computer-aided detection have decreased false-negative and false-positive rates of perceived abnormalities; however, there is limited research in using similar concepts to predict treatment response. Our approach is driven by the goal of precision medicine to determine pretherapy fluorine-18-2-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography imaging parameters to facilitate the identification of patients who would benefit most from yttrium-90 radioembolization therapy, while avoiding complex and costly procedures for those who would not. Our algorithm seeks to predict a patient’s response by discovering common co-occurring image patterns in the lesions of baseline fluorine-18-2-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography scans by extracting invariant shape and texture features. The extracted imaging features were represented as a distribution of each subject based on the bag-of-feature paradigm. The distribution was applied in a multinomial naive Bayes classifier to predict whether a patient would be a responder or nonresponder to yttrium-90 radioembolization therapy based on the imaging features of a pretherapy fluorine-18-2-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography scan. Comprehensive published criteria were used to determine lesion-based clinical treatment response based on fluorine-18-2-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography imaging findings. Our results show that the model is able to predict a patient with liver cancer as a responder or nonresponder to yttrium-90 radioembolization therapy with a sensitivity of 0.791 using extracted invariant imaging features from the pretherapy fluorine-18-2-fluoro-2-deoxy-d-glucose positron emission tomography and computed tomography test. The sensitivity increased to 0.821 when combining extracted invariant image features with variable features of tumor volume.

APA, Harvard, Vancouver, ISO, and other styles

14

Смагин, В. П., А. П. Худяков, and А. А. Бирюков. "Люминесценция ионов Eu-=SUP=-3+-=/SUP=- в матрице фторированной алюмоиттриевой композиции." Физика твердого тела 62, no. 2 (2020): 274. http://dx.doi.org/10.21883/ftt.2020.02.48879.566.

Full text

Abstract:

The optical spectra of fluorinated yttrium aluminum compositions activated by Eu3+ ions were studied. The compositions were synthesized by thermal decomposition at 800 °C of fluorine-containing complexes of yttrium, europium, and aluminum nitrate, isolated as sols from ethyl acetate (EA). The main phases of the compositions are (Y1-xEux)OF and (Y1-xEux)AlO3. Photoluminescence is associated with 5D1,2 → 7F0,1,2 and 5D0 → 7F0,1,2,3,4 electronic transitions of 4f - electrons of Eu3+ ions, replacing yttrium ions in its oxide and oxyfluoride. The dependences of luminescence on the composition and synthesis conditions of the compositions, the wavelength of the exciting radiation, and other factors are established.

APA, Harvard, Vancouver, ISO, and other styles

15

MINUZZI, ORLANDO RENATO RIGON, JOSÉ MAXIMINO TADEU MIRRAS FERRON, ARTUR CEZAR BASTOS NETO, and VITOR PAULO PEREIRA. "Primeira Notícia da Descoberta de Waimirita e Atroarita, Dois Novos Minerais na Mina de Pitinga, AM, Brasil." Pesquisas em Geociências 30, no. 1 (June 30, 2003): 99. http://dx.doi.org/10.22456/1807-9806.19584.

Full text

Abstract:

Waimirite and Atroarite are associated with the core of the albite-granite from the Madeira Granite and occur in different places as thin veins. Waimirite is a yttrium fluoride that macroscopically form massive and white rounded aggregates. Atroarite is a alumino-fluoride and macroscopically form dark grey octahedral crystals. The DRX analyses confirm that they are new minerals.

APA, Harvard, Vancouver, ISO, and other styles

16

Dong, Jianchao, Hailong Xiong, Xiaoxue Wang, Lina Song, Yali Liu, Junfeng Yang, Hongyue Wu, Chunming Yang, and Shucai Gan. "Size and morphology-controlled synthesis of vernier yttrium oxyfluoride towards enhanced photoluminescence and white light emission." New Journal of Chemistry 42, no. 14 (2018): 11351–57. http://dx.doi.org/10.1039/c8nj01962b.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Lin, Tzu-Ken, Dong-Sing Wuu, Shih-Yung Huang, and Wei-Kai Wang. "Preparation and Characterization of Sprayed-Yttrium Oxyfluoride Corrosion Protective Coating for Plasma Process Chambers." Coatings 8, no. 10 (October 22, 2018): 373. http://dx.doi.org/10.3390/coatings8100373.

Full text

Abstract:

This study investigates the microstructure, mechanical and electrical properties of dense yttrium oxyfluoride (YOF) coatings fabricated by the atmospheric plasma spraying technique. Transmission electron microscopy and X-ray diffraction analysis revealed a well crystallized YOF coating with preferred orientations. The YOF coatings were more porous (approximate porosity 0.5%), with higher hardness (290 ± 30 HV), lower electrical resistivity (1016 Ω⋅cm), and breakdown voltage (5.57 kV), than conventional yttrium-fluoride plasma-protective coating. These results indicate the potential of the YOF coating as a novel antiplasma and corrosion-resistant ceramic.

APA, Harvard, Vancouver, ISO, and other styles

18

TSUDA, Hiroki, Jun AKEDO, Shingo HIROSE, and Keishi OHASHI. "Infrared Optical and Mechanical Properties of Ceramic Coatings Fabricated by Aerosol Deposition." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2012, CICMT (September 1, 2012): 000406–10. http://dx.doi.org/10.4071/cicmt-2012-wa411.

Full text

Abstract:

The possibility and mechanical improvement of the infrared ceramic coatings fabricated on fluoride substrates at room temperature by aerosol deposition (AD) were investigated aiming to optical components for infrared applications and devices. The yttria coating possibility fabricated on barium fluoride substrates by the AD process was found by adjusting one of the deposition conditions. The optical and mechanical properties of the fabricated ceramic coatings, which are important in practical applications, were evaluated by transmittance and hardness measurements respectively. The mechanical hardness of the fabricated yttria single coatings was increased to 4 times higher than that of the barium fluoride substrates. Furthermore, by an additional layer on a barium fluoride substrate, the mechanical properties of the fabricated multi-coatings including an upper yttria layer were improved from that of the single yttria coating on the barium fluoride substrate, retaining the IR transmittance of the single yttria coating at the wavelength of 10μm.

APA, Harvard, Vancouver, ISO, and other styles

19

Wang, PengHui, ZhiQiang Li, Walter J. Salcedo, Zhuo Sun, SuMei Huang, and Alexandre G. Brolo. "Surface plasmon enhanced up-conversion from NaYF4:Yb/Er/Gd nano-rods." Physical Chemistry Chemical Physics 17, no. 24 (2015): 16170–77. http://dx.doi.org/10.1039/c5cp02249e.

Full text

Abstract:

The enhancement of upconversion emission from Yb³⁺–Er³⁺–Gd³⁺ co-doped sodium yttrium fluoride (NaYF₄:Yb/Er/Gd) nano-rods (UC NRs) was controlled by gold nanoparticle arrays (AuNPAs) of various periodicities.

APA, Harvard, Vancouver, ISO, and other styles

20

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.

Full text

Abstract:

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. Microprobe analyses reveal that the mineral contains both light and heavy trivalent rare earth elements (REE) (7.9-15.5 wt.% LREE2O3 and 4.9-9.7 wt.% HREE2O3), and that it is enriched in yttrium (7.1 — 14.5 wt.% Y2O3) and fluorine (2.2—3.5 wt.%). Single-crystal structure refinement of the mineral confirms a fluorite-type structure with a cation—anion distance of 2.3471(6) Å. The cerianite-(Ce) is considered to be a late-stage secondary mineral in the carbonatitic rocks.

APA, Harvard, Vancouver, ISO, and other styles

21

Shareefuddin, Md, and M. Narasimha Chary. "Ac response of polycrystalline sodium yttrium fluoride." Solid State Ionics 69, no. 1 (April 1994): 37–41. http://dx.doi.org/10.1016/0167-2738(94)90447-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Vesnin, Yuri I., Vitali V. Lisitsa, and Yuri V. Shubin. "Interaction of Yttrium–Barium Cuprate with Fluorine." Mendeleev Communications 1, no. 1 (January 1991): 30–33. http://dx.doi.org/10.1070/mc1991v001n01abeh000018.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Shareefuddin, Md, U. V. Subba Rao, K. Narasimha Reddy, and M. Narasimha Chary. "Ionic conductivity of doped potassium yttrium fluoride." Crystal Research and Technology 25, no. 11 (November 1990): K278—K282. http://dx.doi.org/10.1002/crat.2170251131.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Shareefuddin, Md, K. Narasimha Reddy, and M. Narasimha Chary. "Complex admittance study of potassium yttrium fluoride." Materials Science and Engineering: B 22, no. 2-3 (January 1994): 159–64. http://dx.doi.org/10.1016/0921-5107(94)90238-0.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Mukherjee, A., A. Awasthi, and N. Krishnamurthy. "Studies on calcium reduction of yttrium fluoride." Mineral Processing and Extractive Metallurgy 125, no. 1 (January 2, 2016): 26–31. http://dx.doi.org/10.1179/1743285515y.0000000017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Peakheart, David W. "Radiation-induced defects in lithium yttrium fluoride." Radiation Effects and Defects in Solids 143, no. 3 (January 1998): 213–24. http://dx.doi.org/10.1080/10420159808212961.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

NARASIMHAREDDY, K. "Conductivity of gadolinium-doped sodium yttrium fluoride." Solid State Ionics 18-19 (January 1986): 1208–10. http://dx.doi.org/10.1016/0167-2738(86)90335-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Blanton, T. N., and L. S. Hung. "An X-ray diffraction study of Tm-doped BaYYbF8 thin films." Powder Diffraction 11, no. 3 (September 1996): 204–8. http://dx.doi.org/10.1017/s0885715600009131.

Full text

Abstract:

Thulium (Tm) doped barium yttrium ytterbium fluoride (BaYYbF8:Tm) thin films have been deposited on (100) silicon (Si) or (100) and (111) gallium arsenide (GaAs) substrates. When deposited on (100) Si, with an intermediate amorphous silicon dioxide (SiO2) layer, the BaYYbF8:Tm film was found to be polycrystalline, crystallizing in a previously unobserved cubic phase with a lattice constant a = 11.4208 (9) Å . Films deposited on GaAs, with an intermediate calcium fluoride (CaF2) layer, showed a high degree of planar orientation. Pole figure analysis revealed that the BaYYbF8:Tm films deposited on CaF2/GaAs are in-plane aligned dependent upon the substrate orientation.

APA, Harvard, Vancouver, ISO, and other styles

29

Zhou, Xingping, Shanshan Li, Xiaoli Chen, Quan Zhu, Zhiqiang Wang, and Jun Zhang. "Formation of Nanocrystalline Matrix of Sodium Rare Earth Fluoride Up-Conversion Phosphors." Journal of Nanoscience and Nanotechnology 8, no. 3 (March 1, 2008): 1392–97. http://dx.doi.org/10.1166/jnn.2008.18202.

Full text

Abstract:

Until now, ytterbium and erbium co-doped sodium yttrium fluoride (NaYF4:Yb, Er) is among the most efficient up-conversion phosphors. Its potential for applications in biological and medical fields has interested many scientists. However, the formation mechanism of the co-doped sodium yttrium fluoride nanoparticles is still unknown. Based on the similarity of rare earth elements, this work started with studying the formation mechanism of NaYF4 nanoparticles without doping in aqueous phase. Effects of reactant concentrations, pH, and reaction time on the particle formation were investigated. As the reaction time increased, NaYF4 nanoparticles grew sporadically. Effect of seeding was also studied. The reaction was not accelerated and the particle size was not altered by seeding. The above investigations suggested that in aqueous solution NaYF4 nanoparticles were formed by the aggregation model. The aggregation of the primary particles may play a key role for the formation and size control of the nanoparticles. Smaller particles were achieved by the presence of chelators of Na2-ethylenediaminetetraacetic acid and sodium nitrilotriacetate. This probably resulted from the adsorption of chelators on the NaYF4 nanoparticles and increased the repulsive force between the primary particles, preventing primary particles to form large particles by aggregation.

APA, Harvard, Vancouver, ISO, and other styles

30

Pagano, Stefano, Guido Lombardo, Massimiliano Orso, Iosief Abraha, Benito Capobianco, and Stefano Cianetti. "Lasers to prevent dental caries: a systematic review." BMJ Open 10, no. 10 (October 2020): e038638. http://dx.doi.org/10.1136/bmjopen-2020-038638.

Full text

Abstract:

ObjectiveTo assess the effectiveness of lasers (at sub-ablative parameters) in reducing caries incidence compared with traditional prophylactic interventions (TPIs) when used alone or together with other TPIs such as pits and fissures sealant or fluoride gels or varnishes.DesignA systematic review. Data sources include Medline (via PubMed), Embase, Web of Science and the Cochrane Library (December 2019).Eligibility criteriaOnly randomised trials (RCTs) and controlled clinical trials (CCTs) dealing with prophylactic lasers use (vs TPI or untreated teeth) were considered as eligible. We excluded in vitro and ex vivo studies.Data extractionEligible studies were selected and data extracted independently by two reviewers. Risk of bias was assessed adopting the Cochrane Risk of Bias tool. Data on caries incidence, sealant retention, fluoride uptake, adverse events, treatment duration, patients’ discomfort and cost-effectiveness ratio was extracted.Data analysisExtracted data were presented narratively due to the heterogeneity of included studies.ResultsSeven RCTs and two CCTs, all with an evident risk of bias, met inclusion criteria, pooling together 269 individuals and 1628 teeth. CO2, neodymium-doped yttrium aluminium garnet, erbium-doped yttrium aluminum garnet (Er:YAG), erbium, chromium: yttrium scandium gallium garnet (Er,Cr:YSGG) and Argon lasers were used. In the permanent dentition, lasers only when used in combination with TPIs were effective in reducing caries when compared with untreated teeth (risk ratio (RR)=0.44 (0.20–0.97); Er:YAG laser) or with TPIs used alone (RR=0.39 (0.22–0.71); CO2 laser). Moreover, Argon laser significantly improved the fluoride uptake into the enamel surfaces (ANalysis Of VAriance (ANOVA) tests: 95%, p<0.0001). Likewise, sealant retention improved when acid etching was performed on previously irradiated enamel fissures by CO2 laser (RR=0.63 (0.38–1.04)) or Er:YAG laser (RR=0.54 (95% CI: 0.34 to 0.87)). In addition, laser resulted safe and well tolerated by patients.ConclusionDespite some positive indications, an inadequate level of evidence was found in the included studies concerning the lasers’ effectiveness in preventing caries. Further studies with a higher methodological quality level are required.

APA, Harvard, Vancouver, ISO, and other styles

31

Wang, Wei-Kai, Sung-Yu Wang, Kuo-Feng Liu, Pi-Chuen Tsai, Yu-Hao Zhang, and Shih-Yung Huang. "Plasma Etching Behavior of SF6 Plasma Pre-Treatment Sputter-Deposited Yttrium Oxide Films." Coatings 10, no. 7 (June 30, 2020): 637. http://dx.doi.org/10.3390/coatings10070637.

Full text

Abstract:

Yttrium oxyfluoride (YOF) protective materials were fabricated on sputter-deposited yttrium oxide (Y2O3) by high-density (sulfur fluoride) SF6 plasma irradiation. The structures, compositions, and fluorocarbon-plasma etching behaviors of these films were systematically characterized by various techniques. After exposure to SF6 plasma, the Y2O3 film surface was fluorinated significantly to form a YOF film with an approximate average thickness of 30 nm. X-ray photoelectron spectroscopy revealed few changes in the elemental and chemical compositions of the surface layer after fluorination, confirming the chemical stability of the YOF/Y2O3 sample. Transmission electron microscopy confirmed a complete lattice pattern on the YOF/Y2O3 structure after fluorocarbon plasma exposure. These results indicate that the SF6 plasma-treated Y2O3 film is more erosion resistant than the commercial Y2O3 coating, and thus accumulates fewer contamination particles.

APA, Harvard, Vancouver, ISO, and other styles

32

Shareefuddin, Md, K. Narasimha Reddy, and M. Narasimha Chary. "Electrical conduction of potassium yttrium fluoride thin films." Journal of Alloys and Compounds 194, no. 1 (April 1993): L1—L3. http://dx.doi.org/10.1016/0925-8388(93)90632-w.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Lai, K. T., F. L. Kwong, and Dickon H. L. Ng. "Superconductivity in fluorine and yttrium co-doped SmFeAsO." Journal of Applied Physics 111, no. 9 (May 2012): 093912. http://dx.doi.org/10.1063/1.4712309.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Takenouchi, A., T. Otomo, K. Niwa, M. Sakai, Y. Saito, T. Kirigane, M. Kosaka, S. Michimura, S. Hasegawa, and O. Nakamura. "Purification of commercial yttrium metal: Removal of fluorine." Journal of Crystal Growth 468 (June 2017): 701–4. http://dx.doi.org/10.1016/j.jcrysgro.2016.11.091.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Shareefuddin, Md, U. V. Subba Rao, K. Narasimha Reddy, and M. Narasimha Chary. "Thermally stimulated discharge currents in potassium yttrium fluoride." Materials Science and Engineering: B 14, no. 1 (June 1992): L1—L4. http://dx.doi.org/10.1016/0921-5107(92)90342-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

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.

Full text

Abstract:

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 the G(r) of the chemical environment of Y and Ce at any value of r. The r-value at which x(M2) vanished, i.e. at which the refined C-type cell becomes a redundant, low-symmetry description of a fluorite cell, was assumed as the size of a C-type domain. Subtle features in G(r) could be attributed to the fluorite or C-type phase up to ~500 Å thanks to the narrow instrumental resolution function of the ID31 beamline (now ID22) at the ESRF, which allows us to get high resolution PDF data.

APA, Harvard, Vancouver, ISO, and other styles

37

Ehrenberg, Helmut, Thomas Hartmann, Kirill G. Bramnik, Gerhard Miehe, and Hartmut Fuess. "Yttrium rhenium oxide, Y7ReO14−δ: a cubic fluorite superstructure." Solid State Sciences 6, no. 3 (March 2004): 247–50. http://dx.doi.org/10.1016/j.solidstatesciences.2004.02.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Di Bartolo, B., and B. E. Bowlby. "Spectroscopic properties of trivalent praseodymium in barium yttrium fluoride." Journal of Luminescence 102-103 (May 2003): 481–86. http://dx.doi.org/10.1016/s0022-2313(02)00584-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

ORAM, OSMAN, RONALD L. GROSS, TODD D. SEVERIN, SILVIA ORENGO-NANIA, and ROBERT M. FELDMAN. "Picosecond Neodymium: Yttrium Lithium Fluoride (Nd:YLF) Laser Peripheral Iridotomy." American Journal of Ophthalmology 119, no. 4 (April 1995): 408–14. http://dx.doi.org/10.1016/s0002-9394(14)71225-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

VESNIN, Y. I., V. V. LISITSA, and Y. V. SHUBIN. "ChemInform Abstract: Interaction of Yttrium Barium Cuprate with Fluorine." ChemInform 22, no. 35 (August 22, 2010): no. http://dx.doi.org/10.1002/chin.199135032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Zhou, Xuezhe, Bennett E. Smith, Paden B. Roder, and Peter J. Pauzauskie. "Laser Refrigeration of Ytterbium-Doped Sodium-Yttrium-Fluoride Nanowires." Advanced Materials 28, no. 39 (August 12, 2016): 8658–62. http://dx.doi.org/10.1002/adma.201600406.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Asiry, Moshabab A., Ibrahim Alshahrani, Nasser D. Alqahtani, and Bangalore H. Durgesh. "Efficacy of Yttrium (III) Fluoride Nanoparticles in Orthodontic Bonding." Journal of Nanoscience and Nanotechnology 19, no. 2 (February 1, 2019): 1105–10. http://dx.doi.org/10.1166/jnn.2019.15894.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Nampi, Padmaja Parameswaran, Harikrishna Varma, P. R. Biju, Tarun Kakkar, Gin Jose, Sikha Saha, and Paul Millner. "Sodium yttrium fluoride based upconversion nano phosphors for biosensing." Journal of Physics: Conference Series 619 (June 17, 2015): 012043. http://dx.doi.org/10.1088/1742-6596/619/1/012043.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Yang, Renyuan, Weiye Song, Shusen Liu, and Weiping Qin. "Electrospinning preparation and upconversion luminescence of yttrium fluoride nanofibers." CrystEngComm 14, no. 23 (2012): 7895. http://dx.doi.org/10.1039/c2ce26160j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Gasviani, N. A., Dzh I. Dzhaparidze, G. N. Kipiani, S. G. Gasviani, and L. M. Abazadze. "Kinetics of the Yttrium Fluoride electroreduction in Chloride melts." Russian Journal of Electrochemistry 41, no. 1 (January 2005): 44–48. http://dx.doi.org/10.1007/s11175-005-0004-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Gasviani, N. A., Dzh I. Dzhaparidze, G. N. Kipiani, S. G. Gasviani, and L. M. Abazadze. "Kinetics of the yttrium fluoride electroreduction in chloride melts." Russian Journal of Electrochemistry 41, no. 1 (January 2005): 44–48. http://dx.doi.org/10.1007/s11175-005-0048-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Luntz-Martin, Danika R., R. Greg Felsted, Siamak Dadras, Peter J. Pauzauskie, and A. Nick Vamivakas. "Laser refrigeration of optically levitated sodium yttrium fluoride nanocrystals." Optics Letters 46, no. 15 (July 30, 2021): 3797. http://dx.doi.org/10.1364/ol.426334.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Minuzzi, Orlando R. R., Artur C. Bastos Neto, Milton L. L. Formoso, Sandra Andrade, Valcir A. Janasi, and Juan A. Flores. "Rare earth element and yttrium geochemistry applied to the genetic study of cryolite ore at the Pitinga Mine (Amazon, Brazil)." Anais da Academia Brasileira de Ciências 80, no. 4 (December 2008): 719–33. http://dx.doi.org/10.1590/s0001-37652008000400012.

Full text

Abstract:

This work aims at the geochemical study of Pitinga cryolite mineralization through REE and Y analyses in disseminated and massive cryolite ore deposits, as well as in fluorite occurrences. REE signatures in fluorite and cryolite are similar to those in the Madeira albite granite. The highest ΣREE values are found in magmatic cryolite (677 to 1345 ppm); ΣREE is lower in massive cryolite. Average values for the different cryolite types are 10.3 ppm, 6.66 ppm and 8.38 ppm (for nucleated, caramel and white types, respectively). Disseminated fluorite displays higher ΣREE values (1708 and 1526ppm) than fluorite in late veins(34.81ppm). Yttrium concentration is higher in disseminated fluorite and in magmatic cryolite. The evolution of several parameters (REEtotal, LREE/HREE, Y) was followed throughout successive stages of evolution in albite granites and associated mineralization. At the end of the process, late cryolite was formed with low REEtotal content. REE data indicate that the MCD was formed by, and the disseminated ore enriched by (additional formation of hydrothermal disseminated cryolite), hydrothermal fluids, residual from albite granite. The presence of tetrads is poorly defined, although nucleated, caramel and white cryolite types show evidence for tetrad effect.

APA, Harvard, Vancouver, ISO, and other styles

49

Thakur, Pradip, Arpan Kool, Biswajoy Bagchi, Nur Amin Hoque, Sukhen Das, and Papiya Nandy. "The role of cerium(iii)/yttrium(iii) nitrate hexahydrate salts on electroactive β phase nucleation and dielectric properties of poly(vinylidene fluoride) thin films." RSC Advances 5, no. 36 (2015): 28487–96. http://dx.doi.org/10.1039/c5ra03524d.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Chase, L. L., and Stephen A. Payne. "Two-photon-absorption cross section ofNd3+in yttrium aluminum garnet and yttrium lithium fluoride near 1.06μm." Physical Review B 34, no. 12 (December 15, 1986): 8883–91. http://dx.doi.org/10.1103/physrevb.34.8883.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!