Single crystals of SrCo₂Al and BaCo₂Al₉ were grown using a self-flux method. A LeBail analysis of the powder X-ray diffraction patterns show that both compounds crystallize in a hexagonal (P6/mmm) crystal structure with lattice parameters: a ​= ​7.8995(1) Å, c ​= ​3.9159(1) Å for SrCo₂Al₉, and a ​= ​7.9162(2) Å, c ​= ​3.9702(1) Å for BaCo₂Al₉ aluminide. The low temperature analysis of the heat capacity measurements give a Sommerfeld coefficient γ ​= ​4.99(6) mJ mol⁻¹ K⁻² for SrCo₂Al₉ and almost twice larger γ ​= ​7.94(9) mJ mol⁻¹ K⁻² for BaCo₂Al₉. Resistivity measurements show metallic-like behavior, with reasonably large residual resistivity ratio RRR ​= ​6 and 10 for SrCo₂Al₉ and BaCo₂Al₉, respectively. Neither heat capacity nor resistivity measurements reveal any phase transition down to 1.8 ​K.

使用自通量法生长SrCo ₂ Al和BaCo ₂ Al _9的单晶。粉末X射线衍射图的LeBail分析表明，两种化合物均以具有晶格参数的六边形（P6 / mmm）晶体结构结晶：a  = 7.8995（1）Å，c  = 3.9159（1）Å SrCo ₂ Al ₉， 对于BaCo ₂ Al ₉铝化物，a  = 7.9162（2）Å，c = 3.9702（1）Å 。热容量测量的低温分析得出Sommerfeld系数γ  = 4.99（6）mJ mol^-1 ķ ^-2为的SrCO ₂的Al ₉和几乎两倍更大的γ  = 7.94（9）毫焦摩尔^-1 ķ ^-2为BACO ₂的Al ₉。电阻率的测量结果表明金属样行为，具有相当大的剩余电阻率比值RRR = 6和10的SrCO ₂的Al ₉和BACO ₂的Al ₉分别。热容量和电阻率测量均未显示任何低至1.8 K的相变。