Moessbauer Effect of Ultra Thin Iron Films. Technical Report No. 62. Page: 47 of 75
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36
and evaporate. loth Godwin and ourselves fiad that this method
heats the substrate considerably. We abandoned this method after
observing that every glass substrate used cracked during vap-
oration.
We found a method of film deposition that appears to be
satisfactory. We used a boat of pyroitic baron nitride'in
the form of a 1/4" I D. tube closed at one end and with approx-
imately 1/16" thick walls. The pyrolitic for. of boron nitride
(ffN) is different from the usual grades of BN in that it is a
crystalline form. It is not hygroscopic, and does not suffer
from the high (14) degree of contamination by impurities that
is characteristic of the standard grades of BN. The material
boron nitride was chosen as a boat material because it is a
refractory material because it is a good heat conductor, and
because it is chemically inert to the I4CL in the alloy
solution. The alloy to be sublimed is made by mixing the drop
of Co57C12 in 0.5 N HC1, the form the radioactivity is shipped,
with a known anoint of FeC in H20. The total volume of the
order of 0.3 ml is placed in the bottom of the BN tube. The
liquid is allowed to evaporate. The IN is them heated in an
H2 atmosphere for at least two hours at a temperature of 930'C.
At this temperature and atmosphere powders of CoCd2, C0, FOC2I
Fe2O3 and FeO were reduced to black conducting amorphous
powders which were assmed to be iron or cobalt powders. After
this procedure a dark thin coating can be seen on the inside
1 Supplied by Union Carbide, Parma, Ohio.
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Zuppero, A. C. Moessbauer Effect of Ultra Thin Iron Films. Technical Report No. 62., report, January 1, 1970; Cleveland, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc870795/m1/47/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.