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