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Rod-like particles of Al_2TiO_5-MgTi_2O_5 solid solutions were synthesized by heating mixed powders of MgO, Al_2O_3 and TiO_2 above 1050℃ in the presence of 10 atom% mixed fluoride of MgF_2 and AlF_3. The rod diameter decreased with decreasing synthesis temperatures while the aspect ratio increased. At a certain temperature the rod diameter increased with increasing MgTi_2O_5 contents while the aspect ratio decreased. A sinterable powder composed of rod-like particles, in which rod diameter and aspect ratio were about 2 μm and about 4, respectively, was obtained by heating the raw materials containing 50% MgTi_2 O_5 at 1200℃. 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.
Al_2TiO_5一MgTi_20_5系配向焼結体の調製と熱膨張特性
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