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Stadler F, Oeckler O, Höppe HA, et al. Crystal structure, physical properties and HRTEM investigation of the new oxonitridosilicate EuSi2O2N2. Chemistry. 2006;12(26):6984-90doi: 10.1002/chem.200600409.
Stadler, F., Oeckler, O., Höppe, H. A., Möller, M. H., Pöttgen, R., Mosel, B. D., Schmidt, P., Duppel, V., Simon, A., & Schnick, W. (2006). Crystal structure, physical properties and HRTEM investigation of the new oxonitridosilicate EuSi2O2N2. Chemistry (Weinheim an der Bergstrasse, Germany), 12(26), 6984-90. https://doi.org/10.1002/chem.200600409
Stadler, Florian, et al. "Crystal structure, physical properties and HRTEM investigation of the new oxonitridosilicate EuSi2O2N2." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 12,26 (2006): 6984-90. doi: https://doi.org/10.1002/chem.200600409
Stadler F, Oeckler O, Höppe HA, Möller MH, Pöttgen R, Mosel BD, Schmidt P, Duppel V, Simon A, Schnick W. Crystal structure, physical properties and HRTEM investigation of the new oxonitridosilicate EuSi2O2N2. Chemistry. 2006 Sep 06;12(26):6984-90. doi: 10.1002/chem.200600409. PMID: 16819723.
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Chemistry. 2006 Sep 06;12(26):6984-90. doi: 10.1002/chem.200600409.

Crystal structure, physical properties and HRTEM investigation of the new oxonitridosilicate EuSi2O2N2.

Chemistry (Weinheim an der Bergstrasse, Germany)

Florian Stadler, Oliver Oeckler, Henning A Höppe, Manfred H Möller, Rainer Pöttgen, Bernd D Mosel, Peter Schmidt, Viola Duppel, Arndt Simon, Wolfgang Schnick

Affiliations

  1. Department Chemie und Biochemie, Lehrstuhl für Anorganische Festkörperchemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13 (D), 81377 Münich, Germany.

PMID: 16819723 DOI: 10.1002/chem.200600409

Abstract

The new layered oxonitridosilicate EuSi(2)O(2)N(2) has been synthesized in a radio-frequency furnace at temperatures of about 1400 degrees C starting from europium(III) oxide (Eu(2)O(3)) and silicon diimide (Si(NH)(2)). The structure of the yellow material has been determined by single-crystal X-ray diffraction analysis (space group P1 (no. 1), a=709.5(1), b=724.6(1), c=725.6(1) pm, alpha=88.69(2), beta=84.77(2), gamma=75.84(2) degrees ,V=360.19(9)x10(6) pm(3), Z=4, R1=0.0631, 4551 independent reflections, 175 parameters). Its anionic Si(2)O(2)N(2) (2-) layers consist of corner-sharing SiON(3) tetrahedra with threefold connecting nitrogen and terminal oxygen atoms. High-resolution transmission electron micrographs indicate both ordered and disordered crystallites as well as twinning. Magnetic susceptibility measurements of EuSi(2)O(2)N(2) exhibit Curie-Weiss behavior above 20 K with an effective magnetic moment of 7.80(5) mu(B) Eu(-1), indicating divalent europium. Antiferromagnetic ordering is detected at 4.5(2) K. EuSi(2)O(2)N(2) shows a field-induced transition with a critical field of 0.50(5) T. The four crystallographically different europium sites cannot be distinguished by (151)Eu Mössbauer spectroscopy. The room-temperature spectrum is fitted by one signal at an isomer shift of delta=-12.3(1) mm s(-1) subject to quadrupole splitting of DeltaE(Q)=-2.3(1) mm s(-1) and an asymmetry parameter of 0.46(3). Luminescence measurements show a narrow emission band with regard to the four crystallographic europium sites with an emission maximum at lambda=575 nm.

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