Coarsening and shape transformation of NiFe<inf>2</inf>O<inf>4</inf> precipitates in a NiO matrix

Scott R. Summerfelt; C. Barry Carter

doi:10.1080/01418619208205619

Coarsening and shape transformation of NiFe<inf>2</inf>O<inf>4</inf> precipitates in a NiO matrix

Scott R. Summerfelt
, C. Barry Carter

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

1 Scopus citations

Abstract

Coarsening and shape transformation of individual NiFeO4 particles in a NiO matrix has been studied by transmission electron microscopy (TEM). A TEM sample of Fe-doped NiO containing NiFe2O4 particles was subjected to a series of heat treatments in air. By examining the same area of the TEM sample before and after each heat treatment, it was possible to observe the effects of the heat treatments on the morphology of many individual spinel particles. The spinel particles transformed from the initial dendritic morphology to an octahedral morphology. Simultaneously, coarsening was observed to occur by two mechanisms: the shrinkage and eventual disappearance of small particles coupled with the growth of large particles and the coalescence of nearby particles which are similar in size. The kinetics of shape transformation were also monitored and occurred approximately 30 times more rapidly at 875°C than at 850°C. © 1992 Taylor & Francis Group, LLC.

Original language	English
Pages (from-to)	1503-1519
Number of pages	17
Journal	Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
Volume	65
Issue number	6
DOIs	https://doi.org/10.1080/01418619208205619
State	Published - Jan 1 1992
Externally published	Yes

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title = "Coarsening and shape transformation of NiFe2O4 precipitates in a NiO matrix",

abstract = "Coarsening and shape transformation of individual NiFeO4 particles in a NiO matrix has been studied by transmission electron microscopy (TEM). A TEM sample of Fe-doped NiO containing NiFe2O4 particles was subjected to a series of heat treatments in air. By examining the same area of the TEM sample before and after each heat treatment, it was possible to observe the effects of the heat treatments on the morphology of many individual spinel particles. The spinel particles transformed from the initial dendritic morphology to an octahedral morphology. Simultaneously, coarsening was observed to occur by two mechanisms: the shrinkage and eventual disappearance of small particles coupled with the growth of large particles and the coalescence of nearby particles which are similar in size. The kinetics of shape transformation were also monitored and occurred approximately 30 times more rapidly at 875°C than at 850°C. {\textcopyright} 1992 Taylor \& Francis Group, LLC.",

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T1 - Coarsening and shape transformation of NiFe2O4 precipitates in a NiO matrix

AU - Summerfelt, Scott R.

AU - Barry Carter, C.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - Coarsening and shape transformation of individual NiFeO4 particles in a NiO matrix has been studied by transmission electron microscopy (TEM). A TEM sample of Fe-doped NiO containing NiFe2O4 particles was subjected to a series of heat treatments in air. By examining the same area of the TEM sample before and after each heat treatment, it was possible to observe the effects of the heat treatments on the morphology of many individual spinel particles. The spinel particles transformed from the initial dendritic morphology to an octahedral morphology. Simultaneously, coarsening was observed to occur by two mechanisms: the shrinkage and eventual disappearance of small particles coupled with the growth of large particles and the coalescence of nearby particles which are similar in size. The kinetics of shape transformation were also monitored and occurred approximately 30 times more rapidly at 875°C than at 850°C. © 1992 Taylor & Francis Group, LLC.

AB - Coarsening and shape transformation of individual NiFeO4 particles in a NiO matrix has been studied by transmission electron microscopy (TEM). A TEM sample of Fe-doped NiO containing NiFe2O4 particles was subjected to a series of heat treatments in air. By examining the same area of the TEM sample before and after each heat treatment, it was possible to observe the effects of the heat treatments on the morphology of many individual spinel particles. The spinel particles transformed from the initial dendritic morphology to an octahedral morphology. Simultaneously, coarsening was observed to occur by two mechanisms: the shrinkage and eventual disappearance of small particles coupled with the growth of large particles and the coalescence of nearby particles which are similar in size. The kinetics of shape transformation were also monitored and occurred approximately 30 times more rapidly at 875°C than at 850°C. © 1992 Taylor & Francis Group, LLC.

UR - https://www.scopus.com/pages/publications/84953621749

U2 - 10.1080/01418619208205619

DO - 10.1080/01418619208205619

M3 - Article

SN - 0141-8610

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SP - 1503

EP - 1519

JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties

IS - 6

ER -

Coarsening and shape transformation of NiFe<inf>2</inf>O<inf>4</inf> precipitates in a NiO matrix

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