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The influence of air and nitrogen atmosphere during heating on TiO2 nano and   micro sized powders as well as sintered polycrystalline specimens was   analyzed. Sintering of TiO2 nano and micro powders in air atmosphere was   monitored in a dilatometer. Non compacted nano and micro powders were   analyzed separately in air and nitrogen atmospheres during heating using   thermo gravimetric (TG) and differential thermal analysis (DTA). The anatase   to rutile phase transition temperature interval is influenced by the powder   particle size and atmosphere change. At lower temperatures for nano TiO2   powder a second order phase transition was detected by both thermal   techniques. Polycrystalline specimens obtained by sintering from nano powders   were reheated in the dilatometer in nitrogen and air atmosphere, and their   shrinkage is found to be different. Powder particle size influence, as well   as the air and nitrogen atmosphere influence was discussed. [Projekat   Ministarstva nauke Republike Srbije, br. OI172057 i br. III45014

Influence of nitrogen and air atmosphere during thermal treatment on micro and nano sized powders and sintered TiO2 specimens