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Commutativity of association schemes of prime square order having non-trivial thin closed subsets
The original publication is available at www.springerlink.comArticleJOURNAL OF ALGEBRAIC COMBINATORICS. 27(3): 307-316 (2008)journal articl
CRYSTALLINE GRAIN SIZE EFFECTS ON THE CONDUCTIVITY OF THE DOPED TIN DIOXIDE (SnO2) WITH ZINC (Zn)
Nigeria
Spray pyrolysis technique was used for the fabrication of the sample. A series of SnO2 and
Zn doped SnO2 (Zn. SnO2) have been deposited on the glass slide with different doping
concentration values of 1 wt.% , 2 wt.% ,3 wt.% and 4 wt.% Zn on SnO2. The average
grain size of the Zn doped SnO2, compare to the average grain size of SnO2 film is clearly
increasing upon increase in doping concentration. However, grain boundary theories were
obeyed except for the 4 wt.% Zn on SnO2 which showed a high level of doping
incompatibility. At 1 wt.% Zn on SnO2 exhibited the characteristics of a homogenous and
stable p-type semiconductor. At 3 wt.% Zn on SnO2, the direction change in the
orientation of two adjacent grains was shown to localize at a site equidistant to the grains
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