{"success":true,"data":{"mp_id":"mp-1994","type":"TRA","summary":{"formula":"HfB2","mp_id":"mp-1994","nelements":2,"is_stable":true,"nsites":3,"density":11.23773,"volume":29.56947,"a":3.13268,"b":3.13268,"c":3.47921,"alpha":90,"beta":90,"gamma":120,"space_group":"P6\/mmm","space_group_num":191,"crystal_system":"Hexagonal","formation_energy_per_atom":-1.08485,"energy_per_atom":-21.03289,"energy_above_hull":0,"point_group":"6\/mmm","Bravais_Lattice":"hP","Bravais_Combination":"hP","packing_fraction":0.7405,"uncorrected_energy_per_atom":-21.032888876666664,"volume_per_atom":9.85649,"c_over_a":1.11062,"b_over_a":1,"poisson_ratio":0.13393,"Is_FCC":0,"Is_BCC":0,"Is_HCP":1},"elasticity":{"k_vrh":252.303,"g_vrh":244.359,"E_Calc(GPa)":554.17,"homogeneous_poisson":0.13393,"Vickers_Hard_Est(GPa)":null,"universal_anisotropy":0.143,"Lame_Lambda(GPa)":89.39699999999999,"Pugh_Ratio(K\/G)":1.0325095453819995,"Ductility":"Ductile","bulk_modulus":252.303,"shear_modulus":244.359,"debye_temperature":709.9,"sound_velocity":5113.7,"homogeneity":0.134},"electronic":{"is_metal":true,"band_gap":0,"is_gap_direct":false,"cbm":null},"magnetic":{"is_magnetic":true,"total_magnetization":0,"ordering":"Unknown","num_magnetic_sites":0,"total_mag_norm_vol":0},"refs":{"mp_url":"https:\/\/materialsproject.org\/materials\/mp-1994","mp_task_ids":["aaacimva","aaadrzki","aaaegurq","aaaeuwjv","aaafjibh"]}}}