NiAl-9Mo (at%) eutectic alloy was produced by a Bridgman type crystal growing facility with Zone Melting Liquid Metal Cooling technique at the growth rate range from 60 to 200 mu m/s. The variation of rod eutectic spacing with growth rates was characterized. Statistical distributions of spacings at each growth rate were also determined. It was confirmed that the relationship between growth rate V and rod spacing lambda follows the Jackson and Hunt equation under high growth rates and can be obtained as lambda(2)V=33.94 mu m(3)/s. In addition, a narrow distribution curve of the rod spacing was obtained for a given growth rate. And the width of the distribution decreases as the growth rate increases. It is probable that the capillarity effect, the high value of entropy of fusion constituent phase NiAl and the convection effect are responsible for the existence of the narrow band of the rod spacing. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.