Landolt-Börnstein - Group III Condensed Matter

7.2.5.2.1 Crystal structure and lattice parameters

Abstract

This chapter deals with crystal structure and lattice parameters of R2Fe17AX compounds with A = C, N, B or D(H). Schematic representation of the hexagonal Th2Ni17-type and rhombohedral Th2Zn17-type structures, and of crystal structures adopted by the R2Fe17 compounds and the corresponding carbides and nitrides are provided. The atomic sites in Nd2Fe17C0.5, Nd2Fe17N2.6, Y2Fe16.5N2.9, Ce2Fe17D5 are tabulated. The dependence of the lattice constants on the C concentration for some R2Fe17Cx compounds, geometrical model of the succession of two nonconservative APBs in hexagonal R2Fe17Cx compounds in [100] orientation and perspective representation of the structural coherence of the hexagonal R2Fe17phase and R1Fe12 phase with (100) interface plane are plotted. Rhombohedral structure of Y2Fe17Cx with only Fe dumb-bells and Y atoms indicated is shown which are relevant for the description of substitutional disorder. Crystal structure, lattice parameters and volume expansion coefficient upon C uptake for R2Fe17Bx and R2Fe17Cx, N uptake for R2Fe17Nx compounds, D(H) uptake for R2Fe17D(H)x compounds, and N uptake for mixed carbides and nitrides R2Fe17CyNx are given. Crystal structure and lattice parameters for mixed transition metal compounds are listed. Temperature dependence of the lattice parameters a, c and of the unit cell volume V and temperature dependence of the shortest Fe-Fe distance in Nd2Fe17D4.9 compound are also provided. Composition dependence of the lattice parameters in (Sm1-yRy)2Fe17Nxwith R = Tb and Y is shown.

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Title
7.2.5.2.1 Crystal structure and lattice parameters
Book Title
Magnetic Alloys for Technical Applications. Hard Magnetic Alloys
In
7.2.5.2 R{2}Fe{17}A{x} compounds with A = C, N, B or D (H)
Book DOI
10.1007/b41058
Chapter DOI
10.1007/10028076_59
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
19I2
Editors
  • H. P. J. Wijn
  • Authors
  • E. Burzo
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