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Godec, Yann Le
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Topics
Publications (8/8 displayed)
- 2023In situ X-ray diffraction study of a TiO2 nanopowder Spark Plasma Sintering under very high pressurecitations
- 2021Microstructural evolution in deforming olivine-serpentine aggregates at subduction zones conditions using in-situ X-ray tomography
- 2020Thermoelastic equation of state and melting of Mg metal at high pressure and high temperaturecitations
- 2018High pressures pathway toward boron-based nanostructured solidscitations
- 2018Synthesis and Properties of Single-Crystalline Na 4 Si 24citations
- 2012Creation of Nanostuctures by Extreme Conditions: High-Pressure Synthesis of Ultrahard Nanocrystalline Cubic Boron Nitridecitations
- 2009Ultimate Metastable Solubility of Boron in Diamond: Synthesis of Superhard Diamondlike BC5citations
- 2009Equation of state of orthorhombic boron, -B28
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article
In situ X-ray diffraction study of a TiO2 nanopowder Spark Plasma Sintering under very high pressure
Abstract
We investigated the effect of very high pressure on the sintering temperature, phase transition and the grain growth during Spark Plasma Sintering (SPS) of a 15 nm TiO2 nanopowder. Using in situ synchrotron X-ray diffraction during sintering at 1.5 and 3.5 GPa, we followed the evolution of the crystalline phases and the crystallite size as a function of temperature. In comparison, in the laboratory, SPS experiments were performed on two original facilities: A Paris-Edinburgh press and a high-pressure module adapted to standard SPS equipment. We studied the effect of the pressure on the sintering in the range 76 MPa to 3.5 GPa. We have shown that highly dense nanostructured ceramics can be prepared under very high pressure at low sintering temperatures. At 1 GPa, we limited the grain growth to an average size of 233 nm by heating at only 560 °C, and achieved a relative density of 98 %.