However, impurities were not observed when powder-to-ball weight ratios R2=1:10 were used (Fig. 1b). The broad bands observed after milling for 10 h at position 160, 276, 409 and 624 cm-1 correspond to the ZrTiO4 phase indicating the formation of this phase induced only due to high energy ball-milling. The bands of mZrO2 with positions at 190, 335 and 474 cm-1 was still visible in this spectrum.