HRTEM study of phase transformation from anatase to rutile in nanocrystalline TiO2 particles

Kyou Hyun Kim, Hoon Park, Jae Pyoung Ahn, Jae-chul Lee, Jong Ku Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The spherical anatase TiO2 nanoparticle of 50 nm in diameter was manufactured by flame method and was subsequently heat-treated to investigate the transformation behavior from anatase to rutile using TEM observation. The anatase particle was facetted at the free surface and a neck formed between the anatase particles prior to the phase transformation. This resulted in the severe lattice distortion at the region of the interface. Unfortunately, we could not find the rutile grain nucleated in the anatase particle due to very fast grain growth. All the phase boundaries observed in HRTEM images existed in the contact between anatase and rutile particles. The nucleation of rutile phase in anatase particle was suppressed at the low heat-treated temperature but the grain growth of rutile particles after the phase transformation grew very fast by the sweeping phenomena of grain boundary. It leaded to the microstructure without the rutile phase traped in anatase particle.

Original languageEnglish
Title of host publicationMaterials Science Forum
Pages65-68
Number of pages4
Volume534-536
EditionPART 1
Publication statusPublished - 2007 Dec 1
Event2006 Powder Metallurgy World Congress and Exhibition, PM 2006 - Busan, Korea, Republic of
Duration: 2006 Sep 242006 Sep 28

Publication series

NameMaterials Science Forum
NumberPART 1
Volume534-536
ISSN (Print)02555476

Other

Other2006 Powder Metallurgy World Congress and Exhibition, PM 2006
CountryKorea, Republic of
CityBusan
Period06/9/2406/9/28

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Keywords

  • Anatase
  • Growth
  • Nucleation
  • Phase boundary
  • Phase transformation
  • Rutile

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Kim, K. H., Park, H., Ahn, J. P., Lee, J., & Park, J. K. (2007). HRTEM study of phase transformation from anatase to rutile in nanocrystalline TiO2 particles. In Materials Science Forum (PART 1 ed., Vol. 534-536, pp. 65-68). (Materials Science Forum; Vol. 534-536, No. PART 1).