Rod-like particles of Al₂TiO₅-MgTi₂O₅ solid solutions were synthesized by heating mixed powders of MgO, Al₂O₃ and TiO₂ above 1050°C in the presence of 10atom% mixed fluoride of MgF₂ and AlF₃. The rod diameter decreased with decreasing synthesis temperatures while the aspect ratio increased. At a certain temperature the rod diameter increased with increasing MgTi₂O₅ contents while the aspect ratio decreased. A sinterable powder composed of rod-like particles, in which rod diameter and aspect ratio were about 2μm and about 4, respectively, was obtained by heating the raw materials containing 50% MgTi₂O₅ at 1200°C. Using the rod-like particles, a sintered body of a highly oriented solid solution with the Lotgering's index f_//a of 0.76, was obtained. Thermal expansion anisotropy was observed, and the hysteresis of the expansion-shrinkage behavior was smaller than that of the sintered body without preferred orientation.