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Journal articles on the topic 'Niob'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 April 2022

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1

Herberich, Gerhard E., Ulli Englert, Klaus Linn, Peter Roos, and Jan Runsink. "(Butadien)(cyclopentadienyl)niob-Komplexe." Chemische Berichte 124, no. 5 (1991): 975–80. http://dx.doi.org/10.1002/cber.19911240502.

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2

Schönherr, Martin, Dieter Hass, and Klaus Baufeld. "Über Niob- und Tantalphenoxidehloride." Zeitschrift für Chemie 15, no. 2 (2010): 66. http://dx.doi.org/10.1002/zfch.19750150220.

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3

Köhler, Jürgen, and Arndt Simon. "NaNb3O5F – eine Niob-Niob-Dreifachbindung mit „side-on”-Koordination durch Nb-Atome." Angewandte Chemie 98, no. 11 (1986): 1011–12. http://dx.doi.org/10.1002/ange.19860981118.

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4

Roesky, Herbert W., Mansoreh Sotoodeh, Yu Ming Xu, Frank Schrumpf, and Mathias Noltemeyer. "Darstellung und Struktur von Tetrafluoro(?5-pentamethylcyclopentadienyl)niob und Tetrafluoro(?5-cyclopentadienyl)niob." Zeitschrift f�r anorganische und allgemeine Chemie 580, no. 1 (1990): 131–38. http://dx.doi.org/10.1002/zaac.19905800116.

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5

Rickert, Andreas, Thomas Nietsch, and Ehrenfried Schütt. "Gleichgewichtsbetrachtungen zum Niob/Wasserstoff-System." Chemie Ingenieur Technik 66, no. 6 (1994): 835–39. http://dx.doi.org/10.1002/cite.330660612.

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6

Henrion, Güunter, and Frank Adler. "Zum polarographischen Verhalten von Niob." Zeitschrift für Chemie 15, no. 8 (2010): 321–22. http://dx.doi.org/10.1002/zfch.19750150824.

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7

Schönherr, Martin, and Joachim Köllner. "Niob- und Tantalalkoxid- und -phenoxidbromide." Zeitschrift für Chemie 18, no. 1 (2010): 36. http://dx.doi.org/10.1002/zfch.19780180123.

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8

Calderazzo, Fausto, Guido Pampaloni, Lucia Rocchi, Joachim Strähle, and Klaus Wurst. "Reduktion des Systems NbX5/AIX3 mit Aluminium in Gegenwart aromatischer Kohlenwasserstoffe: Ein Zugang zu metallorganischen Niob(II)-, Niob(I)- und Niob(0)-Komplexen." Angewandte Chemie 103, no. 1 (1991): 109–10. http://dx.doi.org/10.1002/ange.19911030129.

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9

Herrmann, Wolfgang A., Walter Baratta, and Eberhardt Herdtweck. "Strukturdynamischeansa-Metallocene von Niob und Tantal." Angewandte Chemie 108, no. 17 (1996): 2098–100. http://dx.doi.org/10.1002/ange.19961081724.

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10

Grüner, Daniel, Alim Ormeci, Guido Kreiner, and Yuri Grin. "Laves-Phasen im System Cobalt-Niob." Zeitschrift für anorganische und allgemeine Chemie 630, no. 11 (2004): 1725. http://dx.doi.org/10.1002/zaac.200470065.

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11

Profilet, Robert D., Phillip E. Fanwick, and Ian P. Rothwell. "1,3-Dimetallabenzol-Derivate von Niob und Tantal." Angewandte Chemie 104, no. 9 (1992): 1277–78. http://dx.doi.org/10.1002/ange.19921040942.

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12

Gingl, Franz, та Joachim Strähle. "Synthese und Struktur von μ-Bromo-μ-dioxo-bis( phthalocyaninato-niob(V))tribromid, [(PcNb)2O2Br]+Br3-, einem zweikernigen Phthalocyaninatokomplex / Synthesis and Structure of μ-Bromo-μ-dioxo-bis(phthalocyaninato-niobium(V))tribromide, [(PcNb)2O2Br]+Br3-, a Dinuclear Phthalocyaninato Complex". Zeitschrift für Naturforschung B 44, № 2 (1989): 110–16. http://dx.doi.org/10.1515/znb-1989-0202.

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Abstract dioxo-bis(phthaIocyaninato-niob(V))tribromid, [(PcNb)20 2Br]+BrJ, einem zweikernigen Phthalocyaninatokomplex Synthesis and Structure of i w-Bromo-/ i/-dioxo-bis(phthalocyaninato-niobium(V))tribromide, [(PcNb)20 2Br]~Br3 , i w -Brom o-^-dioxo-bis(phthalocyaninato-niobium (V))tribrom ide. Synthesis. Crystal Structure

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13

Ackermann, Gerhard, and Siegfried Koch. "Untersuchungen an Reagenzien für Niob und Tantal; Ternäre Chelate von Niob(V) mit Aminopolycarbonsäuren und Polyphenolen in wäßriger Lösung." Zeitschrift für Chemie 10, no. 2 (2010): 77–78. http://dx.doi.org/10.1002/zfch.19700100217.

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14

Shahbazi, Mahboobeh, Henrietta Cathey, Natalia Danilova, and Ian Mackinnon. "Single Step Process for Crystalline Ni-B Compounds." Materials 11, no. 7 (2018): 1259. http://dx.doi.org/10.3390/ma11071259.

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Crystalline Ni2B, Ni3B, and Ni4B3 are synthesized by a single-step method using autogenous pressure from the reaction of NaBH4 and Ni precursors. The effect of reaction temperature, pressure, time, and starting materials on the composition of synthesized products, particle morphologies, and magnetic properties is demonstrated. High yields of Ni2B (>98%) are achieved at 2.3–3.4 MPa and ~670 °C over five hours. Crystalline Ni3B or Ni4B3 form in conjunction with Ni2B at higher temperature or higher autogenous pressure in proportions influenced by the ratios of initial reactants. For the same starting ratios of reactants, a longer reaction time or higher pressure shifts equilibria to lower yields of Ni2B. Using this approach, yields of ~88% Ni4B3 (single phase orthorhombic) and ~72% Ni3B are obtained for conditions 1.9 MPa < Pmax < 4.9 MPa and 670 °C < Tmax < 725 °C. Gas-solid reaction is the dominant transformation mechanism that results in formation of Ni2B at lower temperatures than conventional solid-state methods.

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15

Scherer, O. J., R. Winter, and G. Wolmersh�user. "Niob- und Tantalkomplexe mit P2- und P4-Liganden." Zeitschrift f�r anorganische und allgemeine Chemie 619, no. 5 (1993): 827–35. http://dx.doi.org/10.1002/zaac.19936190504.

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16

Henrion, Günter, and Frank Adler. "Rechteckwellenpolarographische Bestimmung von Niob in Anwesenheit von Molybdän." Zeitschrift für Chemie 17, no. 6 (2010): 233–34. http://dx.doi.org/10.1002/zfch.19770170621.

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17

Feuerhake, Robert, and Dieter Fenske. "Synthesen und Kristallstrukturen neuer heterobimetallischer Niob-Kupfer-Chalkogen-Cluster." Zeitschrift für anorganische und allgemeine Chemie 629, no. 1213 (2003): 2317–24. http://dx.doi.org/10.1002/zaac.200300232.

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18

Kolditz, Lothar, Ursula Calov, and Arnd-Rüdiger Grimmer. "Kernresonanzaufnahmen an fluorhaltigen Niob(V)-und Tantal(V)-halogeniden." Zeitschrift für Chemie 10, no. 1 (2010): 35–36. http://dx.doi.org/10.1002/zfch.19700100112.

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19

Bechlars, Bettina, Robert Feuerhake, and Dieter Fenske. "Synthesen und Kristallstrukturen neuer chalkogenido-verbrückter Niob-Kupfer-Cluster." Zeitschrift für anorganische und allgemeine Chemie 633, no. 15 (2007): 2603–13. http://dx.doi.org/10.1002/zaac.200700443.

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20

Bethke, Brandi. "A Networked Landscape: Meaningful Places Along the Niob and MNRR." Practicing Anthropology 38, no. 2 (2016): 11–14. http://dx.doi.org/10.17730/0888-4552-38.2.11.

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This article presents the results of an ethnographic survey of land utilization in the Niobrara National Scenic River (NIOB) and Missouri National Recreational River (MNRR) districts completed for the National Park Service as part of their ongoing Ethnographic Program. It focuses particularly on the Ponca, Omaha, Yankton, and Santee Sioux tribes, each of whom have in the past and continue to maintain unique cultural ties to the riverways. The broad cultural landscape approach used in this study facilitates an exploration of connections between resources (both cultural and natural), significant places, archaeological sites, and landmarks within the districts. Here, I present a discussion of methods for conducting a cultural landscape survey through collaborative research between the National Park Service, university researchers, and Native American stakeholders in order to better understand diverse conceptions of the land and its resources.

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21

Ackermann, Gerhard, and Siegfried Koch. "Niob (V)-Chelate mit Oxalat bzw. Tartrat in wäßriger Lösung." Zeitschrift für Chemie 9, no. 9 (2010): 345–46. http://dx.doi.org/10.1002/zfch.19690090919.

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22

Böhland, Heinz, and Frank-Michael Schneider. "Isomere Niob(V)-chlorid- und Tantal(V)-chlorid-Methylthiocyanat-Verbindungen." Zeitschrift für Chemie 12, no. 2 (2010): 63–64. http://dx.doi.org/10.1002/zfch.19720120208.

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23

Stummeyer, J., S. Kittel, and G. Wünsch. "Möglichkeiten zur routinemäßigen Bestimmung von Elementspuren in Niob und Tantal." Analytica Chimica Acta 258, no. 2 (1992): 329–34. http://dx.doi.org/10.1016/0003-2670(92)85109-j.

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24

Pal, Soupitak, Vikram Jayaram, Sanjay Kumar Biswas, and Yancy Riddle. "Effect of Phases on the Frictional Properties of Electroless Ni-B Nano-Composite Coating." Advances in Science and Technology 66 (October 2010): 120–25. http://dx.doi.org/10.4028/www.scientific.net/ast.66.120.

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As-deposited amorphous (determined through XRD) electroless Ni-B coating upon heat treatment transforms to crystalline phases, Ni3B, Ni2B and Ni whose volume fractions can vary widely. A micro and nano tribological study through ball-on-disk tribometer and lateral force microscopy has been performed to understand the effect of phase mixture (Ni3B +Ni2B) on the frictional properties of this coating. Though scaling of the contact area from micro to nano level strongly influences the friction coefficient, it has also been found that increase in the Ni2B:Ni3B ratio of the crystalline coating reduces the friction coefficient significantly.

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25

Bureš, Radovan, Ivan Saxl, and Mária Fáberová. "Quantification of Carbide Distribution in PM Tool Steels with Niob Addition." Key Engineering Materials 465 (January 2011): 310–13. http://dx.doi.org/10.4028/www.scientific.net/kem.465.310.

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Powder of tool steel STN 19830 with 1.9 wt.% of Nb addition was prepared by atomization. Compact material was prepared using of hot isostatic pressing (HIP) and followed by heat treatment to improve the carbides distribution. The aim of this work was to evaluate and quantify the influence of heat treatment parameters on size, shape and spatial distribution of the carbides. Light optical microscopy and image analysis was used to obtain relevant data. Area fraction of carbides was used as parameter of carbide distribution in steel matrix. Sensitivity and accuracy of this method was compared with technique based on Voronoi tessellation. Result shows that size characteristics of tessellation and area fraction analysis are both sufficiently sensitive to indicate the deviation between different states of the respective material and could be used for quantification of size and spatial distribution of the carbides in PM tool steels. Positive effect of used heat treatment on size and distribution of carbides was verified.

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26

Rehorek, Detlef, Thomas Berthold, Lutz Weber, Hors Hennig та Terence J. Kemp. "Über die Photoreduktion von Tris-μ-oxo-bis-[(tetraphenylporphyrinato)niob(V)]". Zeitschrift für Chemie 29, № 9 (2010): 331–32. http://dx.doi.org/10.1002/zfch.19890290909.

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27

Herberich, Gerhard E., Ingeborg Hausmann, and Norbert Klaff. "Die 30-Elektronenregel der Tripeldeckerkomplexe – Belegbeispiele mit Vanadium, Niob und Tantal." Angewandte Chemie 101, no. 3 (1989): 328–29. http://dx.doi.org/10.1002/ange.19891010316.

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28

Rodrigues, José de Anchieta, and Eckehard Fromm. "Kinetik der Wasserstoffaufnahme und -abgabe von Niob unterhalb von 400 °C." International Journal of Materials Research 76, no. 5 (1985): 320–25. http://dx.doi.org/10.1515/ijmr-1985-760502.

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29

FENG SHAO-XIN, LI BAO-HUI, JIN QING-HUA, GUO ZHEN-YA, and DING DA-TONG. "DETERMINATION OF EMPIRICAL PARAMETERS OF INTER-IONIC POTENTIALS FOR LITHIUM NIOB ATE." Acta Physica Sinica 49, no. 12 (2000): 2433. http://dx.doi.org/10.7498/aps.49.2433.

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30

Herrmann, Wolfgang A., Michael Denk, Florian Dyckhoff, and Joachim Behm. "Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, XCVI Niob- und Tantalkomplexe mit Imido-Liganden." Chemische Berichte 124, no. 11 (1991): 2401–4. http://dx.doi.org/10.1002/cber.19911241104.

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31

Calderazzo, Fausto, Guido Pampaloni, Ullrich Englert, and Joachim Strähle. "Stabilisierung von Niob(o) und Tantal(o) in Heterometallclustern, die Silberatome enthalten." Angewandte Chemie 101, no. 4 (1989): 469–70. http://dx.doi.org/10.1002/ange.19891010412.

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32

Sch�fer, Harald. "Der chemische Transport von Niob(V)-oxid und von Lithiumniobat mit Schwefel." Zeitschrift f�r anorganische und allgemeine Chemie 564, no. 1 (1988): 127–28. http://dx.doi.org/10.1002/zaac.19885640117.

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33

Rabenseifner, L., W. Küsswetter, P. Wünsch, and M. Schwab. "Ist die Knochenbruchheilung bei den gewebeverträglichen Implantatwerkstoffen Tantal und Niob gegenüber Stahlimplantaten verändert?" Zeitschrift für Orthopädie und ihre Grenzgebiete 122, no. 03 (2008): 349–55. http://dx.doi.org/10.1055/s-2008-1044638.

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34

Roesky, Herbert W., Johannes Liebermann, Mathias Noltemeyer, and Hans-Georg Schmidt. "Darstellung und Struktur eines neungliedrigen Niob-haltigen Heterocyclus mit oxidischen und nitridischen Struktureinheiten." Chemische Berichte 122, no. 9 (1989): 1641–43. http://dx.doi.org/10.1002/cber.19891220907.

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35

Herrmann, Wolfgang A., Florian Dyckhoff, and Eberhardt Herdtweck. "Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, CXX. Niob- und Tantalamid–Komplexe sowie neue Cyclocarbodisilazane." Chemische Berichte 125, no. 12 (1992): 2651–56. http://dx.doi.org/10.1002/cber.19921251205.

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36

Weller, F., D. Nu�h�r, and K. Dehnicke. "Bis(triphenylphosphaniminato)niobtrichlorid, [NbCl3(NPPh3)2], ein Komplex mit f�nffach koordiniertem Niob." Zeitschrift f�r anorganische und allgemeine Chemie 615, no. 9 (1992): 7–10. http://dx.doi.org/10.1002/zaac.19926150902.

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37

Weber, Klaus, Klaus Korn, Michael Schulz, Karsten Korth, and Jörg Sundermeyer. "Niob- und Tantal-Komplexe des N-metallierten Hexamethylimidophosphorsäuretriamids und des Tris-tert-butyliminophosphorans." Zeitschrift für anorganische und allgemeine Chemie 625, no. 8 (1999): 1315–20. http://dx.doi.org/10.1002/(sici)1521-3749(199908)625:8<1315::aid-zaac1315>3.0.co;2-b.

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38

Krumeich, F., A. Hussain, C. Bartsch, and R. Gruehn. "Zur Pr�paration und Struktur gemischtvalenter Niob-Wolframoxide der Zusammensetzung (Nb,W)17O47." Zeitschrift f�r anorganische und allgemeine Chemie 621, no. 5 (1995): 799–806. http://dx.doi.org/10.1002/zaac.19956210517.

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39

Kauffmann, Thomas, Thomas Abel, Gabriele Neiteler, and Martin Schreer. "Chlorierende methylierung von aldehyd- und ketogruppen mit niob-reagenzien sowie aufklärung des mechanismus." Tetrahedron Letters 31, no. 4 (1990): 503–6. http://dx.doi.org/10.1016/0040-4039(90)87019-v.

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40

Wünsch, G., and A. Wennemer. "Spektrallinien und Koinzidenztafeln zur Bestimmung von Zirkonium, Niob und Tantal mit dem ICP." Fresenius' Zeitschrift für analytische Chemie 329, no. 5 (1987): 546–70. http://dx.doi.org/10.1007/bf00488204.

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41

Nikoli, B., and M. Bozina. "P-33 Nasotracheal intubation “on blind” (NIOB) in the patients apartment — Case report." Resuscitation 31, no. 3 (1996): S29. http://dx.doi.org/10.1016/0300-9572(96)83892-5.

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42

Krumeich, F., G. Liedtke, and W. Mader. "Pr�paration und transmissionselektronenmikroskopische Charakterisierung quatern�rer Niob-Wolframoxide des Titans, Zirconiums und Hafniums." Zeitschrift f�r anorganische und allgemeine Chemie 623, no. 1-6 (1997): 990–96. http://dx.doi.org/10.1002/zaac.199762301155.

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43

Rautschke, Ruth, Pinelopi Michael, and Silke John. "Atomspektroskopische Untersuchungen von Niob und Tantal in den Matrizes C, SiO2 und SiO2/C." Zeitschrift für Chemie 18, no. 1 (2010): 29–30. http://dx.doi.org/10.1002/zfch.19780180117.

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44

Herberich, G. E., B. Hessner та H. Mayer. "Bildung eines neuartigen (η-1,3-butadienyl)niob-komplexes durch reaktion von 2-butin mit bis(η-cyclopentadienyl)-niobtrihydrid: systheses, kristall- und molekülstruktur von bis(η-cyclopentadienyl) [1,3,4-η3-(1,2,3,4- tetramethyl-1,3-butadienyl)]niob". Journal of Organometallic Chemistry 314, № 1-2 (1986): 123–30. http://dx.doi.org/10.1016/0022-328x(86)80357-6.

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45

Shopska, Maya, Zara Cherkezova-Zheleva, Daniela Paneva, et al. "Biogenic iron compounds: XRD, Mossbauer and FTIR study." Open Chemistry 11, no. 2 (2013): 215–27. http://dx.doi.org/10.2478/s11532-012-0148-5.

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AbstractMaterials based on biogenic iron oxides, which are a product of the metabolic activities of the neutrophilic iron-oxidizing bacteria (NIOB) from Sphaerotilus-Leptothrix group, were investigated. Natural microbial probes were collected from freshwater flow from Vitosha Mountain (Bulgaria) and cultivated under laboratory conditions in respect to select suitable cultures and conditions (nutrition media) for biomaterial accumulation of biogenic oxides. Samples were studied by physicochemical methods: X-ray diffraction, Mossbauer spectroscopy and IR spectroscopy. Their phase composition and physicochemical properties were obtained. Presence of both amorphous and crystal phase (ultra- and highly dispersed particles) was proved. Iron-containing compound in the natural biomass consists of α-FeOOH. The cultivated materials have more complex composition with iron-containing ingredients as α-FeOOH, Γ-FeOOH, Γ-Fe2O3 and Fe3O4. The sample of natural biomass was tested in reaction of CO oxidation and it showed potential to be used as catalyst support.

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46

Tatsumi, Kazuyuki, Yoitsu Sekiguchi, Akira Nakamura, Roger E. Cramer, and John J. Rupp. "[Et4N][M(SCH2CH2S)3] (M  Nb, Ta), homoleptische 1,2-Ethandithiolato-Komplexe von Niob und Tantaln." Angewandte Chemie 98, no. 1 (1986): 95–96. http://dx.doi.org/10.1002/ange.19860980120.

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47

Herrmann, Wolfgang A., Norbert W. Huber, Peter Härter, Michael Denk, and Florian Dyckhoff. "Mehrfachbindungen zwischen Hauptgruppenelementen und übergangsmetallen, CII. Flüchtige MN4-Metallkomplexe von Niob und Tantal mit Dimethylsilyl-Substituenten." Chemische Berichte 125, no. 1 (1992): 117–18. http://dx.doi.org/10.1002/cber.19921250119.

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48

Kammermeier, Bernhard, Gerhard Beck, Detlev Jacobi, and Heiner Jendralla. "Vanadium(II)- und Niob(III)-induzierte, diastereoselektive Pinakol-Kupplung homochiraler Peptidaldehyde zuC2-symmetrischen HIV-Protease-Inhibitoren." Angewandte Chemie 106, no. 6 (1994): 719–21. http://dx.doi.org/10.1002/ange.19941060630.

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49

Herzog, S., and E. Wulf. "Über die erstmalige Darstellung des Lithium-Tris-2, 2′-Dipyridyl-Niob(-1) Li[NbDipy3] · 3,5 THE." Zeitschrift für Chemie 6, no. 11 (2010): 434–35. http://dx.doi.org/10.1002/zfch.19660061125.

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50

Herrmann, Wolfgang A., Werner R. Thiel, and Eberhardt Herdtweck. "Synthesen und Strukturen neuer Komplexes des 2,2′-Bipyridins mit Niob, Molybdän, Wolfram und Rhenium in hohen Oxidationsstufen." Chemische Berichte 123, no. 2 (1990): 271–76. http://dx.doi.org/10.1002/cber.19901230208.

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