Among the metal hydrides, Th₄H₁₅ is the first reported superconductor with a relatively high T _c ≈ 8 K at ambient pressure. Here we report on the synthesis and characterization of a low-T _c superconducting modification of Th₄H₁₅, which is obtained via hydrogenating Th metal at 5 GPa and 800 C by using the ammonia borane as the hydrogen source. Measurements of resistivity, magnetic susceptibility, and specific heat confirm that the obtained Th₄H₁₅ sample shows a bulk superconducting transition at T _c ≈ 6 K, which is about 2 K lower than that reported previously. Various characteristic superconducting parameters have been extracted for this compound and unusual lattice dynamics were evidenced from the specific-heat analysis.

间的金属氢化物，钍₄ ħ ₁₅是具有相对高的首次报道超导体Ť _Ç ≈在环境压力为8K。在这里，我们报告了Th ₄ H ₁₅的低T _c超导改性的合成和表征，它是通过使用氨硼烷作为氢源在5 GPa和800 C的温度下氢化Th金属而获得的。电阻率，磁化率和比热的测量结果证实，所获得的Th ₄ H ₁₅样品在T _c处显示出体积超导转变 ≈6 K，比以前报告的值低约2K。已为该化合物提取了各种特征性超导参数，并且通过比热分析证明了异常的晶格动力学。