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Journal Article

New Ternary Alkaline Earth Metal Cerium (IV) Nitrides: CaCeN2 and SrCeN2

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Niewa,  R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kniep,  R.
Rüdiger Kniep, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Prots', Y., Niewa, R., Schnelle, W., & Kniep, R. (2002). New Ternary Alkaline Earth Metal Cerium (IV) Nitrides: CaCeN2 and SrCeN2. Zeitschrift für Anorganische und Allgemeine Chemie, 628(7), 1590-1596. doi:10.1002/1521-3749(200207)628:7<1590:AID-ZAAC1590>3.0.CO;2-F.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-313D-F
Abstract
CaCeN2 and SrCeN2 were prepared by reactions of Li2CeN2 with Ca3N2 or Sr2N in a nitrogen atmosphere at 1020 K. According to measurements of the magnetic susceptibilities both compounds contain Ce-IV. The crystal structures were determined by full- profile Rietveld refinements of the X-ray powder diffraction patterns. CaCeN2 crystallizes in a rocksalt-type structure with disordered Ca and Ce (space group Fm (3) over barm, a = 499.21(1) pm, R-profile = 0.061, R-Bragg = 0.034). The low temperature modification of SrCeN2 crystallizes in the alpha- NaFeO2 type structure (space group R (3) over barm, a = 362.18(4) pm, c = 1795.8(2) pm, R-profile = 0.085, R-Bragg = 0.031). At elevated temperatures an order-disorder phase transition leads to HT-SrCeN2 (space group Fm (3) over barm, a = 515.01(2) pm, quenched from 1273 K) with a cubic unit cell and complete disorder of Sr and Ce.