本文研究了TbMn_(6-x)Co_xSn_6（x＝0.03，0.6，0.9，1.2和1.5）赝三元化合物的结构和磁性.结果表明：用Co部分取代TbMn6Sn6中的Mn不改变其晶体结构，但随Co含量的增加晶格常数和单胞体积单调减小;居里温度随Co含量增大而降低;自旋重取向温度也随Co含量增大而降低，但Co含量≥0.6时自旋重取向消失;Co含量≥0.9时，热磁曲线上出现补偿点旦补偿温度随Co含量增大而升高;4.5K的饱和磁化强度先随Co含量增大而减小，在x=0.6时达到极小值，而后随Co含量的继续增加而增大.
Structure and magnetic properties of quasi-ternary TbMn6-xCoxSn6 compounds with x=0.0, 0.3, 0.6, 0.9, 1.2 and 1.5 have been studied. The structure of TbMn6-xCoxSn6 compounds has not been changed on Co substitution. The substitution of Co for Mn in TbMn6Sn6 results in a monotonous decrease in the lattice constants and the unit-cell volume. The ordering temperature decreases monotonously with increasing Co content. The reorientation temperature decreases with increasing Co content and the reorientation of easy axis magnetization of TbMn6Sn6 disappeared at x=0.6. When x exceeding 0.9 a compensation temperature was observed in the thermal magnetization curve and the compensation temperature increases with increasing Co content. The saturation magnetization at 4.5 K decreases to a minimum at x=0.6 and then increases again.
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