By Bertil Aronsson, Torsten Lundström, Ingvar Engström (auth.), Fred W. Vahldiek, Stanley A. Mersol (eds.)

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Additional info for Anisotropy in Single-Crystal Refractory Compounds: Proceedings of an International Symposium on Anisotropy in Single-Crystal Refractory Compounds, held on June 13–15, 1967, in Dayton Ohio. Sponsored by the Ceramics and Branch of the air Force Materials La

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Hence the lattice constant of Fig. 4. An 100 netplane of a-Fe. The FeAl z0 4 molecule is too thick. CRYSTAL STRUCTURE AND CHEMlSTRY 48 Table Z Paracrystals in Mn x ~ x Fe 3 -x 04 spinels lattice plane g (%) 1. 01 >ZOOO 1. 19 the promoted catalyst is the same as that of the unpromoted one. The shape of this molecule, however, is not the same as that of the seven Fe-atoms, since the ions too small ones. ° -ions have too large diameters, the Fe ++ - and Al+t+_ This kind of filling in bricks (FeAI Z0 4 ) into a lattice is called "endotaxy".

C) RhsS4. with all the atoms in the twofold position 2l/~ independent hOl-reflexions. b ~Si5. 6l4A, £ In fig. 6b the structure is pro- ~-plane. 8l3A and Z = 4. Sl0A, The space-group is ~ with all the atoms in the fourfold position 4(£). The structure was determined and refined using 332 independent hOl-reflexions. In fig. 6c the structure is projected on the ~-plane. ARONSSON,T. 6a). Metal atoms in the MnP-type structure form infinite parallel zig-zag chains, and if these are systematically broken down to shorter chains a structural series is formed where this chain length is different for different members of the series.

D :. 05 w/o of any impurity element in general) and, as expected, no variation in stoichiometry was detectable. Both as-grown crystals and specimens treated in vacuum at temperatures as low as l600°C exhibited evidence of severe surface 8i loss. The loss of Si resulted in the formation of phases which contained le;3s S1 than that present in WSi 2 . A section through a crystal heated in vacuum to 1700°C exhibited two surface phases (X, Y) in addition to the matrix WSi 2 • Figure 10 shows the relative WLa and SiKa x-ray intensity available from each phase.

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