X-ray topography and diffractometry are used to study the crystal structure
of cadmium pyroniobate Cd2Nb2O7 at room temperature. Structural quality pa
rameters were determined for crystals grown with different degrees of impur
ity doping. The nature of the crystal lattice damage is analyzed as a funct
ion of the type and concentration of impurities. (C) 1999 American Institut
e of Physics. [S1063-7850(99)02107-2].