Enhanced bulk modulus and reduced transition pressure in
                gamma-Fe2O3 nanocrystals.

Jianzhong Jiang; J. Staun Olsen; Leif Gerward; Steen Mørup

Enhanced bulk modulus and reduced transition pressure in gamma-Fe2O3 nanocrystals.

Jianzhong Jiang
, J. Staun Olsen
, Leif Gerward
, Steen Mørup

Department of Physics

Niels Bohr Institute

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Synchrotron radiation X-ray diffraction studies of gamma-Fe2O3 have been performed with emphasis on the pressure-induced phase transformation gamma(maghemite) - alpha(hematite) and the equation of state of the nanophase material. For gamma-Fe2O3 the bulk modulus has been found to increase from 203 GPa for the bulk material to 305 GPa for 9 nm size crystals. At the same time the transition pressure decreases from 35 to 27 GPa. The reduced transition pressure is explained in terms of nucleation and growth, the larger volume change upon transition in the nanocrystalline material being the main factor.

Original language	English
Journal	EPL
Volume	44
Issue number	5
Pages (from-to)	620-626
ISSN	0295-5075
Publication status	Published - 1998

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title = "Enhanced bulk modulus and reduced transition pressure in gamma-Fe2O3 nanocrystals.",

abstract = "Synchrotron radiation X-ray diffraction studies of gamma-Fe2O3 have been performed with emphasis on the pressure-induced phase transformation gamma(maghemite) - alpha(hematite) and the equation of state of the nanophase material. For gamma-Fe2O3 the bulk modulus has been found to increase from 203 GPa for the bulk material to 305 GPa for 9 nm size crystals. At the same time the transition pressure decreases from 35 to 27 GPa. The reduced transition pressure is explained in terms of nucleation and growth, the larger volume change upon transition in the nanocrystalline material being the main factor.",

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T1 - Enhanced bulk modulus and reduced transition pressure in gamma-Fe2O3 nanocrystals.

AU - Jiang, Jianzhong

AU - Olsen, J. Staun

AU - Gerward, Leif

AU - Mørup, Steen

PY - 1998

Y1 - 1998

N2 - Synchrotron radiation X-ray diffraction studies of gamma-Fe2O3 have been performed with emphasis on the pressure-induced phase transformation gamma(maghemite) - alpha(hematite) and the equation of state of the nanophase material. For gamma-Fe2O3 the bulk modulus has been found to increase from 203 GPa for the bulk material to 305 GPa for 9 nm size crystals. At the same time the transition pressure decreases from 35 to 27 GPa. The reduced transition pressure is explained in terms of nucleation and growth, the larger volume change upon transition in the nanocrystalline material being the main factor.

AB - Synchrotron radiation X-ray diffraction studies of gamma-Fe2O3 have been performed with emphasis on the pressure-induced phase transformation gamma(maghemite) - alpha(hematite) and the equation of state of the nanophase material. For gamma-Fe2O3 the bulk modulus has been found to increase from 203 GPa for the bulk material to 305 GPa for 9 nm size crystals. At the same time the transition pressure decreases from 35 to 27 GPa. The reduced transition pressure is explained in terms of nucleation and growth, the larger volume change upon transition in the nanocrystalline material being the main factor.

M3 - Journal article

SN - 0295-5075

VL - 44

SP - 620

EP - 626

JO - EPL

JF - EPL

IS - 5

ER -