Neutron Powder diffraction studies of Ce sub 3 B sub 2 N sub 4 and isotypic RE sub 3 B sub 2 N sub 4 compounds (RE=La, Pr, Nd, MM)

Journal Article · Sat Sep 01 00:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb06739.x· OSTI ID:5996718

Rogl, P; Klesnar, H ^[1]; Fischer, P ^[2]

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1. Inst. fur Physikalische Chemie, Univ. Wien, A-1090 Wien (AT)
2. Labor fur Neutronenstreuung, Eidgenossische Technische Hochschule Zurich, CH-5232 Villigen, Paul Scherrer Inst. (CH)

This paper reports the crystal structure of Ce{sub 3}B{sub 2}N{sub 4} (space group Immm, a = 0.35653(5) nm,b = 0.63160(21) nm,c = 1.07131(50) nm) was derived from X-ray powder photographs; precise atom parameters, atom occupancies, atom order, and interatomic distances obtained from room-temperature neutron powder diffraction data employing the Rietveld profile analysis method. The final reliability values of the refinement were R{sub F} = 0.059 and R{sub 1} = 0.068. Boron atoms in triangular prismatic metal coordination (Ce{sub 6}B) are at a distance of 0.1785(7) nm and form pairs. In a tetrakaidecahedral surrounding (Ce{sub 6}B)BN{sub 2}, each boron atom forms single bonds with two nitrogen atoms at a distance of 0.1464(4) nm. Nitrogen atoms thus are in rectangular pyramidal metal coordination (Ce{sub 5}N) with one additional boron atom completing a distorted octahedron (Ce{sub 5}BN).

• OSTI ID: 5996718
• Journal Information: Journal of the American Ceramic Society; (USA), Vol. 73:9; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
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SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORON NITRIDES
NEUTRON DIFFRACTION
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NEUTRAL-PARTICLE TRANSPORT
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
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