{"success":true,"data":{"mp_id":"mp-15157","type":"ELA","summary":{"formula":"Cs2CaF4","mp_id":"mp-15157","nelements":3,"is_stable":true,"nsites":7,"density":4.22511,"volume":150.08606,"a":4.49853,"b":4.49853,"c":8.06947,"alpha":106.17919,"beta":106.17889,"gamma":90.00331,"space_group":"I4\/mmm","space_group_num":139,"crystal_system":"Tetragonal","formation_energy_per_atom":-3.47212,"energy_per_atom":-5.1121,"energy_above_hull":0,"point_group":"4\/mmm","Bravais_Lattice":"tI","Bravais_Combination":"tI","packing_fraction":null,"uncorrected_energy_per_atom":-13.43391,"volume_per_atom":21.44087,"c_over_a":1.7938,"b_over_a":1,"poisson_ratio":0.30369,"Is_FCC":0,"Is_BCC":0,"Is_HCP":0},"elasticity":{"k_vrh":32.545,"g_vrh":14.702,"E_Calc(GPa)":38.334,"homogeneous_poisson":0.304,"Vickers_Hard_Est(GPa)":0.803,"universal_anisotropy":0.781,"Lame_Lambda(GPa)":22.74366666666667,"Pugh_Ratio(K\/G)":2.2136444021221604,"Ductility":"Brittle","bulk_modulus":32.545,"shear_modulus":14.702,"debye_temperature":473.5,"sound_velocity":2084.6,"homogeneity":0.304},"electronic":{"is_metal":false,"band_gap":6.091,"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-15157","mp_task_ids":["aaacmwox","aaadmqox","aaaelyah","aaaenhur","aaaezrnm","aaafsbpw"]}}}