In this study, TiO2 powders are synthesized from ammonium hexafluoride titanate (AHFT, (NH4)2TiF6) as a precursor by heat treatment. First, we evaluate the physical properties of AHFT using X-ray diffraction (XRD), particle size analysis (PSA), thermogravimetric analysis (TGA), and field-emission scanning electron microscopy (FESEM). Then, to prepare the TiO2 powders, is heat-treated at 300-1300oC for 1 h. The ratio of anatase to rutile phase in TiO2 is estimated by XRD. The anatase phase forms at 500oC and phase transformation to the rutile phase occurs at 1200oC. Increase in the particle size is observed upon increasing the reaction temperature, and the phase ratio of the rutile phase is determined from a comparison with the calculated XRD data. Thus, we show that anatase and rutile TiO2 powders could be synthesized using AHFT as a raw material, and the obtained data are utilized for developing a new process for producing high-quality TiO2 powder.

Abstract
 1. 서 론
 2. 실험방법
  2.1. 원료 및 TiO2 합성
  2.2. 분석
 3. 결과 및 고찰
 4. 결 론
 References

• 이덕희(고등기술연구원 신소재공정센터) | Duk-Hee Lee (Advanced Materials & Processing Center, Institute for Advanced Engineering)
• 박재량(고등기술연구원 신소재공정센터) | Jae-Ryang Park (Advanced Materials & Processing Center, Institute for Advanced Engineering)
• 이찬기(고등기술연구원 신소재공정센터) | Chan-Gi Lee (Advanced Materials & Processing Center, Institute for Advanced Engineering)
• 박경수(고등기술연구원 신소재공정센터) | Kyung-Soo Park (Advanced Materials & Processing Center, Institute for Advanced Engineering) Corresponding Author
• 김현모((주)모노리스) | Hyeon-Mo Kim (Monolith Co. Ltd.)