Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell: Reaction under Autogenic Pressure at Elevated Temperature of CoZr2(acac)2(OiPr) 8

Swati V. Pol; Vilas G. Pol; Gulaim Seisenbaeva; Vadim G. Kessler; A. Gedanken

doi:10.1021/cm049830s

Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell: Reaction under Autogenic Pressure at Elevated Temperature of CoZr₂(acac)₂(OⁱPr) ₈

Swati V. Pol, Vilas G. Pol, Gulaim Seisenbaeva, Vadim G. Kessler, A. Gedanken

Department of Chemistry

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Abstract

Spherical Co and ZrO₂ particles in the size range of 11-16 nm, exhibiting at room temperature metastable phases, fcc for cobalt and tetragonal for zirconia, were synthesized, by the reaction under autogenic pressure at elevated temperature (RAPET) technique. The tetragonal phase in ZrO₂ was obtained without doping the ZrO₂ with trivalent impurities. Using high-resolution transmission electron microscopy and selected area energy-dispersive X-ray analysis it is manifested that a carbon shell of ∼4 nm thickness is formed on the surface of Co and ZrO₂ nanocrystallites. This carbon shell is responsible for stabilizing the high-temperature metastable phases at room temperature. These two products were obtained by the dissociation of CoZr₂(acac)₂(O ⁱPr)₈ at 700 °C under its autogenic pressure.

Original language	English
Pages (from-to)	1793-1798
Number of pages	6
Journal	Chemistry of Materials
Volume	16
Issue number	9
DOIs	https://doi.org/10.1021/cm049830s
State	Published - 4 May 2004

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title = "Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell: Reaction under Autogenic Pressure at Elevated Temperature of CoZr2(acac)2(OiPr) 8",

abstract = "Spherical Co and ZrO2 particles in the size range of 11-16 nm, exhibiting at room temperature metastable phases, fcc for cobalt and tetragonal for zirconia, were synthesized, by the reaction under autogenic pressure at elevated temperature (RAPET) technique. The tetragonal phase in ZrO2 was obtained without doping the ZrO2 with trivalent impurities. Using high-resolution transmission electron microscopy and selected area energy-dispersive X-ray analysis it is manifested that a carbon shell of ∼4 nm thickness is formed on the surface of Co and ZrO2 nanocrystallites. This carbon shell is responsible for stabilizing the high-temperature metastable phases at room temperature. These two products were obtained by the dissociation of CoZr2(acac)2(O iPr)8 at 700 °C under its autogenic pressure.",

author = "Pol, {Swati V.} and Pol, {Vilas G.} and Gulaim Seisenbaeva and Kessler, {Vadim G.} and A. Gedanken",

year = "2004",

month = may,

day = "4",

doi = "10.1021/cm049830s",

language = "אנגלית",

volume = "16",

pages = "1793--1798",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

number = "9",

}

Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell: Reaction under Autogenic Pressure at Elevated Temperature of CoZr₂(acac)₂(OⁱPr) ₈. / Pol, Swati V.; Pol, Vilas G.; Seisenbaeva, Gulaim et al.
In: Chemistry of Materials, Vol. 16, No. 9, 04.05.2004, p. 1793-1798.

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

TY - JOUR

T1 - Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell

T2 - Reaction under Autogenic Pressure at Elevated Temperature of CoZr2(acac)2(OiPr) 8

AU - Pol, Swati V.

AU - Pol, Vilas G.

AU - Seisenbaeva, Gulaim

AU - Kessler, Vadim G.

AU - Gedanken, A.

PY - 2004/5/4

Y1 - 2004/5/4

N2 - Spherical Co and ZrO2 particles in the size range of 11-16 nm, exhibiting at room temperature metastable phases, fcc for cobalt and tetragonal for zirconia, were synthesized, by the reaction under autogenic pressure at elevated temperature (RAPET) technique. The tetragonal phase in ZrO2 was obtained without doping the ZrO2 with trivalent impurities. Using high-resolution transmission electron microscopy and selected area energy-dispersive X-ray analysis it is manifested that a carbon shell of ∼4 nm thickness is formed on the surface of Co and ZrO2 nanocrystallites. This carbon shell is responsible for stabilizing the high-temperature metastable phases at room temperature. These two products were obtained by the dissociation of CoZr2(acac)2(O iPr)8 at 700 °C under its autogenic pressure.

AB - Spherical Co and ZrO2 particles in the size range of 11-16 nm, exhibiting at room temperature metastable phases, fcc for cobalt and tetragonal for zirconia, were synthesized, by the reaction under autogenic pressure at elevated temperature (RAPET) technique. The tetragonal phase in ZrO2 was obtained without doping the ZrO2 with trivalent impurities. Using high-resolution transmission electron microscopy and selected area energy-dispersive X-ray analysis it is manifested that a carbon shell of ∼4 nm thickness is formed on the surface of Co and ZrO2 nanocrystallites. This carbon shell is responsible for stabilizing the high-temperature metastable phases at room temperature. These two products were obtained by the dissociation of CoZr2(acac)2(O iPr)8 at 700 °C under its autogenic pressure.

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Stabilization of Metastable Face-Centered Cubic Cobalt and the Tetragonal Phase of Zirconia by a Carbon Shell: Reaction under Autogenic Pressure at Elevated Temperature of CoZr₂(acac)₂(OⁱPr) ₈

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