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- W1982151477 abstract "Festkörperreaktionen zwischen Selten-Erd-Elementen und hexagonalem BN erfordern hohe Reaktionstemperaturen und liefern in der Regel keine reinen Produkte. Durch exotherme Festkörper-Metathese-Reaktionen können Nitridoborate des Lanthans effektiv hergestellt werden. Die Metathese-Reaktion zwischen LaCl3 und Li3BN2 zündet bei 560 °C. Einkristalle werden bei etwas höheren Temperaturen aus dem bei der Reaktion entstandenen LiCl-Flux gebildet. In modifizierten Metathese-Reaktionen können unterschiedliche N-Gehalte von Zielverbindungen durch Li3N eingestellt werden. Der Zusatz von Lithium ermöglicht Synthesen von metallreichen Nitridoboraten. Nach diesen Methoden wurden Nitridoborate wie La3B3N6, La6B4N10, La3+x(B2N4)Nx (x = 0, 1, 2) und die supraleitfähige Verbindung La3Ni2B2N3 hergestellt. A Solid State Metathesis Route for the Synthesis of Lanthanum Nitridoborates Solid state reactions between rare earth elements and hexagonal BN afford high reaction temperatures and often do not yield pure products. Exothermic solid state metathesis reactions provide an effective route for the synthesis of nitridoborates of lanthanum. An ignition of the metathesis reaction between LaCl3 and Li3BN2 was obtained at 560 °C. Single-crystal growth was obtained at slightly higher temperatures by the aid of a LiCl flux, that is formed during the reaction. Modified metathesis reactions with additional Li3N may be used to adjust certain N contents for desired compositions. Additional lithium metal is used to synthesize metal-rich nitridoborates. The preparative route presented here, was not only used for the synthesis of nitridoborates such as La3B3N6, La6B4N10 or La3+x(B2N4)Nx (x = 0, 1, 2), but also for the superconductive compound La3Ni2B2N3. http://www.uni-tuebingen.de/AK H.-J.-Meyer Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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- W1982151477 date "2002-09-01" @default.
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- W1982151477 title "Eine Festkörper-Metathese-Route zur Synthese von Nitridoboraten des Lanthans" @default.
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