Polytypism has been observed among delafossite-type compounds; AgFe02, AgCoO2 and AgCrO2. This phenomenon was also observed in Cu3TiO4. The crystal structure of Cu3TiO4 (2 H) has been reported in the previous paper. A polytype-Cu3TiO4 (3 R) has a trigonal lattice with the unit cell dimensions; a0=5.995 A and a=29.27°.
The 3 R-type of Cu3TiO4 was synthesized by heating the mixture (3 mol Cu0+1 mol Ti02) at 1050° C in an oxygen stream for several hours followed by rapid quenching. The above two types usually coexist and their ratio depends on the oxygen pressure. At higher oxygen pressure and at lower one, Cu3TiO4 (3 R) and Cu3TiO4 (2 H) are mainly produced, respectively.
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