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Unit-cell parameters of La 3 Nb 0.5 Ga 5.5 O 14  (langanite) have been determined at a number of pressures up to 23GPa in diamond anvil high pressure cells with single crystal X-ray diffraction techniques. The anisotropic behaviour of unit cell parameters of langanite is caused by differences of bonding strength in direction parallel to the  a - and  c -axis. Within the investigated pressure range, the  c / a -ratio increases from 0.6232 to 0.6503. The volume compressibility of trigonal langanite (space group  P 321) is the 0.007 GPa -1 , with calculated bulk modulus of 145(3)GPa (B' 0 =1.4(8)). At a pressure of 12.4(3)GPa a first-order phase transition was detected, characterised by a discontinuity in the pressure dependence of lattice parameter  c . The high-pressure phase (presumably monoclinic,  A 2) with a volume compressibility of 0.011 GPa -1  (B 0 =93(2) GPa, B' 0 =1.9(9)) is more compressible as compared to the initial phase due to an abnormal pressure dependence of lattice parameter  a .

Influence of high hydrostatic pressure on lattice parameters of a single crystal of La 3 Nb 0.5 Ga 5.5 O 14