Relevant bibliographies by topics / Gallium niobium sulfides mixed

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Academic literature on the topic 'Gallium niobium sulfides mixed'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Gallium niobium sulfides mixed"

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Grippa, Alexander Yu, Sven Lidin, Gunnar Svensson, Dmitry P. Rupasov, Nellie R. Khasanova, Oleg G. D'yachenko, and Evgeny V. Antipov. "New strontium and rare earth-based mixed niobium misfit sulfides." Solid State Sciences 5, no. 3 (March 2003): 495–502. http://dx.doi.org/10.1016/s1293-2558(03)00023-2.

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Deshmane, Chinmay A., Jacek B. Jasinski, Paul Ratnasamy, and Moises A. Carreon. "Synthesis and catalytic properties of mesoporous, bifunctional, gallium–niobium mixed oxides." Chemical Communications 46, no. 34 (2010): 6347. http://dx.doi.org/10.1039/c0cc01962c.

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Yao, Xaioqiang, Greg Marking, and Hugo F. Franzen. "Metal-Rich Sulfides of Mixed Tantalum and Niobium: A New Chemical Concept." Berichte der Bunsengesellschaft für physikalische Chemie 96, no. 11 (November 1992): 1552–57. http://dx.doi.org/10.1002/bbpc.19920961107.

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Duncan, J. C., L. Touryan, and L. W. Hobbs. "Characterization of the oxidation and oxidation-sulfidation of chromium niobium alloys." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 674–75. http://dx.doi.org/10.1017/s0424820100171109.

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Materials in mixed corrosion environments, such as those in coal gasification processes or other energy conversion systems, may be exposed to both oxygen and sulfur. Alloys that exhibit simultaneous oxidation and sulfidation resistance are sought for these applications. Alloys containing sufficient Al or Cr readily form a protective oxide scale but generally have high sulfidation rates. Refractory metals, such as Nb or Mo, form protective sulfides but oxidize at catastrophic rates. Materials containing additives of one of these groups have been studied for their complex corrosion resistance. A binary alloy containing components from each group (Cr and Nb) has been investigated in mixed oxidants .Isothermal thermogravimetric measurements give overall scale growth kinetics but do not give details for complex scales or substrates. Multiple layers, different growth regimes and preferential corrosion can complicate interpretation. The environmental SEM with a hot stage attachment allows the observation of scale development at temperature.
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Sun, Meng, Shu Zhang, Kai-Yao Wang, Juan Wang, Lin Cheng, Jia-Ying Zhu, Yi-Ming Zhao, and Cheng Wang. "Mixed Solvothermal Synthesis of Tn Cluster-Based Indium and Gallium Sulfides Using Versatile Ammonia or Amine Structure-Directing Agents." Inorganic Chemistry 60, no. 10 (April 29, 2021): 7115–27. http://dx.doi.org/10.1021/acs.inorgchem.1c00171.

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Mondillo, N., R. Herrington, A. J. Boyce, C. Wilkinson, L. Santoro, and M. Rumsey. "Critical elements in non-sulfide Zn deposits: a reanalysis of the Kabwe Zn-Pb ores (central Zambia)." Mineralogical Magazine 82, S1 (February 28, 2018): S89—S114. http://dx.doi.org/10.1180/minmag.2017.081.038.

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ABSTRACTThe Kabwe Zn-Pb deposit (central Zambia) consists of a cluster of mixed sulfide and non-sulfide orebodies. The sulfide ores comprise sphalerite, galena, pyrite, chalcopyrite and accessory Ge-sulfides (±Ga and In). The non-sulfide ores comprise: (1) willemite-dominated zones encasing massive sulfide orebodies and (2) oxide-dominated alteration bands, overlying both the sulfide and Zn-silicate orebodies. This study focuses on the Ge, In and Ga distribution in the non-sulfide mineralization, and was carried out on a suite of Kabwe specimens, housed in the Natural History Museum Ore Collection (London). Petrography confirmed that the original sulfides were overprinted by at least two contrasting oxidation stages dominated by the formation of willemite (W1 and W2), and a further event characterized by weathering-related processes. Oxygen isotopic analyses have shown that W1 and W2 are unrelated genetically and furthermore not related to supergene Zn-Pb-carbonates in the oxide-dominated assemblage. The δ18O composition of 13.9–15.7‰ V-SMOW strongly supports a hydrothermal origin for W1. The δ18O composition of W2 (−3.5‰ to 0‰ V-SMOW) indicates that it precipitated from groundwaters of meteoric origin in either a supergene or a low-T hydrothermal environment. Gallium and Ge show a diversity of distribution among the range of Zn-bearing minerals. Gallium has been detected at the ppm level in W1, sphalerite, goethite and hematite. Germanium occurs at ppm levels in W1 and W2, and in scarcely detectable amounts in hemimorphite, goethite and hematite. Indium has low concentrations in goethite and hematite. These different deportments among the various phases are probably due to the different initial Ga, In and Ge abundances in the mineralization, to the different solubilities of the three elements at different temperatures and pH values, and finally to their variable affinities with the various minerals formed.
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Grossholz, Hagen, Dirk D. Zimmermann, Oliver Janka, and Thomas Schleid. "Oxidfluoridsulfide der Lanthanoide vom Formeltyp M6O2F8S3 (M=La–Nd, Sm, Gd) / Oxide Fluoride Sulfides of the Lanthanoids with the Formula M6O2F8S3 (M = La–Nd, Sm, Gd)." Zeitschrift für Naturforschung B 68, no. 7 (July 1, 2013): 751–60. http://dx.doi.org/10.5560/znb.2013-3110.

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The lanthanoid(III) oxide fluoride sulfides M6O2F8S3 (M = La-Nd, Sm, Gd) can be obtained by reacting the rare-earth metals, their trifluorides and sesquioxides with elemental sulfur in appropriate molar ratios at 850 °C flux-assisted by NaCl in gas-tightly sealed niobium or tantalum ampoules. All compounds are colorless, except for those containing M = Pr with green, M = Nd with lilac and M = Sm with yellow color. They form transparent single crystals as needles or rods. The M6O2F8S3 representatives crystallize in a hexagonal structure (space group: P63/m; a≈1382 - 1326, c≈398 - 376 pm, c/a≈0:288 - 0.284; Z =2) with two different crystallographic M3+ positions. The (M2)3+ cations reside in ninefold coordination of anions arranged as tricapped trigonal prisms formed by three F-, four mixed-occupied O2-/F- and two S2- anions, resembling the unique M3+ coordination sphere of the M3OF5S-type oxide fluoride sulfides. The (M1)3+ cations are surrounded by square antiprisms built of four O2-/F- and S2- anions each, which are capped by one F- anion each, again resulting in a ninefold coordination similar to that of the A-MFS-type fluoride sulfides. While the crystallographically unique S2- anions have six cationic neighbors arranged in trigonal prisms, there are four different light-anion positions. Two of them, representing only fluoride anions, are situated in a triangular environment of cations ((F1)-: planar, (F2)-: non-planar). The mixed-occupied light-anion positions (F3)-=(O3)2- and (F4)-=(O4)2- exhibit tetrahedral coordination spheres with a ratio F- :O2- =2 : 1. The M6O2F8S3 arrangement is characterized by an empty hexagonal channel structure created by (F1)- anions with a potential of accommodating alkali-metal cations like Na+. All single-crystal X-ray structure investigations did not indicate any ordering of the O2- and F- anions, but MAPLE calculations revealed a slightly favored oxygen occupation for the (F4)-=(O4)2- rather than for the (F3)-=(O3)2- position. Electron-beam microanalyses gave no evidence for the incorporation of either Na+ or Cl- ions stemming from NaCl used as the flux.
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Dissertations / Theses on the topic "Gallium niobium sulfides mixed"

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Berretil, Slimane. "Proprietes electroniques des semi-conducteurs magnetiques gamo : :(4)s::(8), gamo::(4)se::(8), gamo::(4)se::(4)te::(4) et ganb::(4)s::(8)." Paris 6, 1987. http://www.theses.fr/1987PA066262.

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Etudes effectuees en vue de preciser la nature des electrons qui participent ala conduction et au magnetisme de ces composes. Les composes, caracterises par la presence d'amas tetraedriques des ions metalliques mo et nb dans les bas etats d'oxydation, revelent des proprietes de magnetisme itinerant repondant au modele de stoner-wohlfarth avec les densites d'etats les plus elevees observees dans des composes intermetalliques 3d ou 4d. La rpe a confirme que les raies observees correspondant aux ions metalliques dans un etat s = 3/2 (ions mo**(3+) et nb**(3+)); leur elargissement est d'origine dipolaire retrecie par echange et les valeurs des integrales d'echange obtenues sont en bon accord avec celles obtenues a partir des temperatures de curie
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Ben, Salem Azzedine. "Synthese et caracterisation physique et structurale des conducteurs unidimensionnels de type fe : :(1+x)nb::(3-x)se::(10)." Nantes, 1987. http://www.theses.fr/1987NANT2018.

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Ce compose est le prototype d'une serie de formulation (mm')nb::(2)s::(10)(mm' = fe,v,cr,nb,ta) presentant une chaine trigonale prismatique |nbse::(3)| et une double chaine oelaedrique |(mm')se::(6)|. Ces composes ont une transition metal isolant vers 140 k. L'observation d'une onde de densite de charge aux caracteristiques identiques a celles de nbse::(3) indique que la chaine conductrice est la chaine trigonale prismatique |nbse::(3)|. La variation de la conductivite au voisinage de la transition indique un mecanisme de localisation d'anderson. Les proprietes physiques du compose ou se a ete substitue par s ont ete etudiees. L'etude de l'insertion par li a ete effectuee
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Saifi, Ali. "Contribution à l'étude des propriétés magnétiques des systèmes spinelles isolants CdCr2xIn2-2xS4 et ZnCr2xGa2-2xO4 : phases type verre de spin." Paris 6, 1986. http://www.theses.fr/1986PA066519.

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Ces systèmes présentent la percolation et la frustration. Le premier composé est ferromagnétique, tandis que le second présente des interactions antiferromagnétiques. On étudie en fonction de x les transitions de ces composés. Les transitions de phase du gallate ont été étudiées par effet Mössbauer. On a mis en évidence que pour x0,75 l'ordre magnétique tend vers un ordre caractéristique de la "vraie" phase verre de spin.
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