cpTi:
  lattice: hP
  c/a: 1.587
  mechanical:
    elastic:
      type: Hooke
      references:
        - L. Wang et al.,
          Acta Materialia 132, 598-610, 2017,
          10.1016/j.actamat.2017.05.015
      C_11: 162.4e9
      C_33: 181.6e9
      C_44: 47.2e9
      C_12: 92e9
      C_13: 69e9