Synthesis of nanosize tetratitanium heptoxide and its anomalous phase transition

Hiroko Tokoro; Yusuke Araki; Iori Nagata; Takahiro Kondo; Kenta Imoto; Shin-ichi Ohkoshi

doi:10.1080/21663831.2020.1743788

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Synthesis of nanosize tetratitanium heptoxide and its anomalous phase transition

Original Reports | 更新时间：2026-08-19

- Synthesis of nanosize tetratitanium heptoxide and its anomalous phase transition
- Materials Research Letters Vol. 8, Issue 7, Pages: 261-267(2020)
- 作者机构：
  
  1. Department of Materials Science Faculty of Pure and Applied Sciences University of Tsukuba Tsukuba Japan
  2. Department of Materials Science Faculty of Pure and Applied Sciences University of Tsukuba
  3. Department of Chemistry School of Science The University of Tokyo
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2020.1743788
  CLC：
- Online First：15 April 2020，
  
  Published：2020
- 稿件说明：
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Hiroko Tokoro, Yusuke Araki, Iori Nagata, et al. Synthesis of nanosize tetratitanium heptoxide and its anomalous phase transition[J]. Materials Research Letters, 2020, 8(7): 261-267.
DOI：

Hiroko Tokoro, Yusuke Araki, Iori Nagata, et al. Synthesis of nanosize tetratitanium heptoxide and its anomalous phase transition[J]. Materials Research Letters, 2020, 8(7): 261-267. DOI： 10.1080/21663831.2020.1743788.

摘要

Abstract

BSTRACTTetratitanium heptoxide

is known to exhibit a two-step phase transition from the charge-delocalized to charge-localized phase and the charge-disordered to charge-ordered phase around 150 K and 130 K

respectively. Herein

a nanoscopic effect of the Ti

phase transition is studied. A one-step phase transition from the charge-delocalized to charge-localized phase is realized in Ti

nanocrystals where the transition from the charge-disordered to charge-ordered phase is suppressed. Perturbation to the free energy by the surface energy can explain this anomalous phase transition. The present nanoscopic effect

which can control cooperativity in phase transitions

should contribute to develop advanced switching materials.

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