It has been a hot issue to search for hydrides at high pressure with high superconducting transition temperature (T_c). In this work, we studied YBaH_n (n = 2∼12) at 50 - 200 GPa and found that most of YBaH₂₋₁₂ are thermodynamically stable with respect to the elementary YBa and H systems at this pressure range. The most stable phases of YBaH₄, YBaH₅ and YBaH₈ from genetic algorithm (GA) search have C2/m, P3m1 and P4/mmm symmetries at 50 GPa, and P6/mmm, R3m and P4/mmm at 150 GPa, respectively. The P4/mmm-YBaH₈ was suggested to be formed by BaH₂ + YH₆ → YBaH₈. In addition, the electric properties, phonon spectra and the superconductivity of the YBaH₈ and BaH₂ were calculated and discussed. The T_c of P4/mmm-YBaH₈ was predicted to be 49.6 K at 50 GPa and 89.4 K at 150 GPa.

在高压下以高超导转变温度（T _c）搜索氢化物一直是一个热门问题。在这项工作中，我们研究了在50-200 GPa下的YBaH _n（n = 2-12），发现在该压力范围内，大部分YBaH _2-12对于基本的YBa和H系统是热力学稳定的。遗传算法（GA）搜索得到的YBaH ₄，YBaH ₅和YBaH ₈的最稳定相在50 GPa时具有C 2 / m，P 3 m 1和P 4 / mmm对称性，以及P 6 / mmm，R150 GPa时分别为3 m和P 4 / mmm。所述P 4 / MMM -YBaH ₈建议通过BAH形成₂ + YH ₆ →YBaH ₈。另外，计算并讨论了YBaH ₈和BaH ₂的电性能，声子谱和超导性。经t _Ç的P 4 / MMM -YBaH ₈被预测为在50GPa的49.6 K和在为150GPa 89.4ķ。