An electron-diffraction study of NaF thin films condensed in vacuum
Abstract
An electron-diffraction study was made of the structure of deposits of NaF condensed in vacuum on to polished stainless steel and on fresh NaCl cleavage faces. The structure of co-deposits of Nacl and NaF on polished stainless steel was also studied.
The observed stages of development of the NaF deposits were similar to those found in the case of NaCl under the same conditions, by Ramos and Wilman and which were described in a previous paper. The effect of the atmospheric moisture was not so marked as in the NaCl deposits.
Epitaxial growth of NaF deposits condensed in vacuum on to fresh cleavage faces of NaCl was found even in deposition on substrates virtually at room temperature, as well as when this was initially at 200°C.
The experiments made with simultaneous condensation of NaCl and NaF in vacuum on stainless steel show that the cell dimensions of both materials in the co-deposits agree closely with those of the materials when they were deposited individually, and moreover the “reflection” patterns show that the crystals in the co-deposit have the same orientation as in the separate deposits. However the cell dimensions obtained for the NaF is slightly larger than that found by Swanson and Tatge with x-rays.
It appears, therefore, that there was little or no formation of solid solutions of NaF and NaCl, each kind of crystal growing in the same manner as when the other material was absent.
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- The crystal structure of barium hydroxide octahydrate Ba(OH)2·8H2O*
- The crystal structure of anhydrous zinc metaborate Zn4O(BO2)6
- Relations between diffuse reflections and geometry of the unit cells in isomorphous compounds [Me(II)(N2H4)2]Cl2
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- Crystal structure of an authigenic maximum microcline
- The crystal structure of tetrahedrite, Cu12Sb4S13
- Stacking relations in the hexagonal ferrites and a new series of mixed-layer structures*
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