Crystal growth and structure refinement of hollandite-type K1.59Ga1.59Ti6.41O16

Needle-like hollandite-type K1.59Ga1.59Ti6.41O16 single crystals were obtained by the flux slow-cooling method. The average dimensions of a single crystal were a length of about 2 mm and a diameter of about 250 μm. Structure refinement under a newly presented constraint condition was calculated by the JANA2006 program. The final reliability factors under an anisotropic constraint were R = 0.0153 and wR = 0.0481.