Samarium Monosulfide Films Prepared from Organometallic Compounds
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SAMARIUM MONOSULFIDE FILMS PREPARED FROM ORGANOMETALLIC COMPOUNDS
L.V.ZAVYALOVA, Institute
* Institute ** Institute
G.A.DOMRACHEV, O.N.SUVOROVA, G.S.SVECHNIKOV.
E.A.SHUPAK*
AND
of Semiconductors,45 Prospect Nauki, Kiev, Ukraine, of Metalloorganic Chemistry,Nizniy Novgorod,Russia of Nuclear Research,47 Prospekt Nauki,Kiev,Ukraine
ABSTRACT The possibility of preparation SmS films by the chemical method from organic compounds has been studied.
For this
purpose
three types of coordinatively-saturated compounds based on dithiocarbamate complexes were synthesized and studied by various methods. Films were prepared by solution sputtering of these substances onto various substrates heated to the temperatures of 1800-300 0 C. The polycrystalline textured SmS films with thicknesses ranging from 0.1 to 1.5 mm and various stoichiometric compositions including samarium monosulfide films of cubic modificati0 on with the lattice constant of oC = 5.70 A were prepared.
Films of the rare-earth chalcogenide elements especially samarium monosulfide with abnormally high strain sensitivity are widely used as a strain and pressure sensors. films due to the phase transition of the first
In
addition,
SmS
kind metal-semi-
conductor can be used as an information cell for the optically recorded informatin [l).The vacuum-deposition techniques, which have been thoroughly elaborated and are frequently used to prepare such films do not provide sufficient reproduction and stable characteristics
yet.
It
is
shown [2,3] that for the various
semiconductors chemical methods of their preparation allow to get rid of these drawbacks. The material under consideration is the result of investigations aimed at SmS film formation from organic compounds by the chemical method. For this purpose three types of starting materials, organic compounds with the Sm-S bond, containing dithiocarbamate ligands(dtc) were synthesized. ments:
l.sufficient
These materials meet certain require-
volatility of compounds;
2.simple sVnthe-
Mat. Res. Soc. Symp. Proc. Vol. 282. 01993 Materials Research Society
698
3.good solu-
process and high output level of Sm complexes;
sis
of sulfur-containing Sm compounds in organic solvents. The following sulfur-containing Sm compounds were synthesized:
bility
Sm(at
2
NCS 2 ) 3 -
(I); Sm(8t
) 3 bipy -
2 NCS 2
(II);
Sm(Et
2
NCS 2 ) 3 phen-
They were prepared through interaction of samarium chloride with natrium diethyldithiocarbamate(compound I) and adding -(III).
of different ligands: 2,2-bipyridyl(compound nanthrolin
(compound III).
II),
and 1,10-phe-
Compound I therefore is
ly-unsaturated and compounds II
coordinative-
and III are more volatile comp-
lexes with the coordinatively-saturated agent (Sm).
inner sphere of complex
All compounds were practically colourless crystalline structures with the melting temperatures of Tml= 1700C (compound I), Tm2 = 2100C and T m= 2000C (compound III) and have good solubility
in
chloroformethylene
chloride and other organic solvents.
After recrysta
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