Influence of the crystal structure on the physical properties of monoclinic ZrO2 nanocrystals

Minori Taguchi; Akiyuki Matsushita; Tetsuo Uchikoshi; Yoshio Sakka; Seiichi Takami; Toshitaka Funazukuri; Takashi Naka

doi:10.1016/j.nanoso.2015.03.001

Influence of the crystal structure on the physical properties of monoclinic ZrO₂ nanocrystals

Minori Taguchi, Akiyuki Matsushita, Tetsuo Uchikoshi, Yoshio Sakka, Seiichi Takami, Toshitaka Funazukuri, Takashi Naka

Division of Process and System Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The influence of the crystal structure on the physical properties of monoclinic ZrO₂ nanocrystals is investigated by an annealing treatment. Monoclinic ZrO₂ nanocrystals with diameters of approximately 20 nm are synthesized by a hydrothermal method using subcritical water. The nanocrystals have chemisorbed water molecules, hydroxides and nitro groups on their surfaces. The crystallographic structures are reformed by annealing the nanocrystals at 800 °C for 5 h. This treatment causes the crystallite sizes to increase, the crystal lattice to shrink and some of the molecules chemisorbed on the surfaces to be lost. The annealing treatment leads to there being fewer lattice defects, and to the modification of surface characteristics of the nanocrystals. The treatment also changes the optical absorption characteristics of the nanocrystals. The magnetic moments caused by lattice defects are identified.

Original language	English
Pages (from-to)	1-6
Number of pages	6
Journal	Nano-Structures and Nano-Objects
Volume	1
DOIs	https://doi.org/10.1016/j.nanoso.2015.03.001
Publication status	Published - 2015 Oct 14

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics
Physical and Theoretical Chemistry

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title = "Influence of the crystal structure on the physical properties of monoclinic ZrO2 nanocrystals",

abstract = "The influence of the crystal structure on the physical properties of monoclinic ZrO2 nanocrystals is investigated by an annealing treatment. Monoclinic ZrO2 nanocrystals with diameters of approximately 20 nm are synthesized by a hydrothermal method using subcritical water. The nanocrystals have chemisorbed water molecules, hydroxides and nitro groups on their surfaces. The crystallographic structures are reformed by annealing the nanocrystals at 800 °C for 5 h. This treatment causes the crystallite sizes to increase, the crystal lattice to shrink and some of the molecules chemisorbed on the surfaces to be lost. The annealing treatment leads to there being fewer lattice defects, and to the modification of surface characteristics of the nanocrystals. The treatment also changes the optical absorption characteristics of the nanocrystals. The magnetic moments caused by lattice defects are identified.",

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AU - Taguchi, Minori

AU - Matsushita, Akiyuki

AU - Uchikoshi, Tetsuo

AU - Sakka, Yoshio

AU - Takami, Seiichi

AU - Funazukuri, Toshitaka

AU - Naka, Takashi

PY - 2015/10/14

Y1 - 2015/10/14

N2 - The influence of the crystal structure on the physical properties of monoclinic ZrO2 nanocrystals is investigated by an annealing treatment. Monoclinic ZrO2 nanocrystals with diameters of approximately 20 nm are synthesized by a hydrothermal method using subcritical water. The nanocrystals have chemisorbed water molecules, hydroxides and nitro groups on their surfaces. The crystallographic structures are reformed by annealing the nanocrystals at 800 °C for 5 h. This treatment causes the crystallite sizes to increase, the crystal lattice to shrink and some of the molecules chemisorbed on the surfaces to be lost. The annealing treatment leads to there being fewer lattice defects, and to the modification of surface characteristics of the nanocrystals. The treatment also changes the optical absorption characteristics of the nanocrystals. The magnetic moments caused by lattice defects are identified.

AB - The influence of the crystal structure on the physical properties of monoclinic ZrO2 nanocrystals is investigated by an annealing treatment. Monoclinic ZrO2 nanocrystals with diameters of approximately 20 nm are synthesized by a hydrothermal method using subcritical water. The nanocrystals have chemisorbed water molecules, hydroxides and nitro groups on their surfaces. The crystallographic structures are reformed by annealing the nanocrystals at 800 °C for 5 h. This treatment causes the crystallite sizes to increase, the crystal lattice to shrink and some of the molecules chemisorbed on the surfaces to be lost. The annealing treatment leads to there being fewer lattice defects, and to the modification of surface characteristics of the nanocrystals. The treatment also changes the optical absorption characteristics of the nanocrystals. The magnetic moments caused by lattice defects are identified.

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