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• W1992998576 abstract "A high energy amorphous ZrO(OH)2·xH2O precursor (porous) is obtained by a controlled hydrolysis of dispersed Zr4+ cations in an aqueous solution in reaction with NH4OH at 5 °C followed by aging and drying of the recovered gel at room temperature. At 20–40 °C in air, the excess H2O evaporates leaving behind a porous ZrO(OH)2·xH2O powder with Φ ∼37% porosity. X-ray diffraction characterizes its amorphous structure with two halos at 20.8 and 36.7 nm−1 wavevectors. On heating, a reconstructive ZrO2 phase transformation occurs from a refined amorphous state at 500 °C to form a new orthorhombic structure with a=0.3340, b=0.5535 and c=0.6364 nm lattice parameters. Average crystallite size is D∼15 nm. This irreversibly transforms to m-ZrO2 at D⩾23 nm at 800 °C or above. A schematic energy level diagram for the precursor and the metastable ZrO2 polymorphs is proposed with the observation of the phase transformations." @default.
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• W1992998576 date "2004-01-01" @default.
• W1992998576 modified "2023-10-16" @default.
• W1992998576 title "Reconstructive phase formation of ZrO2 nanoparticles in a new orthorhombic crystal structure from an energized porous ZrO(OH)2·xH2O precursor" @default.
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• W1992998576 doi "https://doi.org/10.1016/s0272-8842(03)00095-6" @default.
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