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Pressure Synthesis (pressure + synthesis)
Selected AbstractsAtmospheric Pressure Synthesis of Heavy Rare Earth Sesquioxides Nanoparticles of the Uncommon Monoclinic PhaseJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 11 2007Bing Guo We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20,60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE2O3 (RE=Dy, Ho, Er, Tm, and Yb). The RE2O3 nanoparticles, prepared by a flame synthesis process, were characterized by X-ray diffraction, transmission electron microscopy, and electron energy loss spectroscopy. Monoclinic nanoparticles were formed when the flame temperature was sufficiently high; lower temperatures led to the formation of the normal cubic (C-type) phase. We explain the formation of the uncommon monoclinic phase on the basis of pressure,temperature phase equilibria, and the extra internal pressure induced by surface curvature of the nanoparticles. [source] High Pressure Synthesis and Characterization of New Members of the RuSr2(Ln, Ce)2Cu2O10 Family (Ln: Y, Dy).CHEMINFORM, Issue 44 2005Jose Manuel Gallardo-Amores Abstract For Abstract see ChemInform Abstract in Full Text. [source] High Pressure Synthesis and Structure of a Novel Clathrate-Type Compound: Te7+xSi20-x (x , 2.5).CHEMINFORM, Issue 50 2003Nicolas Jaussaud Abstract For Abstract see ChemInform Abstract in Full Text. [source] Advancements in the Search for Superhard Ultra-Incompressible Metal Borides,ADVANCED FUNCTIONAL MATERIALS, Issue 22 2009Jonathan B. Levine Abstract Dense transition metal borides have recently been identified as superhard materials that offer the possibility of ambient pressure synthesis compared to the conventional high pressure, high temperature approach. This feature article begins with a discussion of the relevant physical properties for this class of compounds, followed by a summary of the synthesis and properties of several transition metal borides. A strong emphasis is placed on correlating mechanical properties with electronic and atomic structure of these materials in an effort to better predict new superhard compounds. It concludes with a perspective of future research directions, highlighting some recent results and presenting several new ideas that remain to be tested. [source] Atmospheric Pressure Synthesis of Heavy Rare Earth Sesquioxides Nanoparticles of the Uncommon Monoclinic PhaseJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 11 2007Bing Guo We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20,60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE2O3 (RE=Dy, Ho, Er, Tm, and Yb). The RE2O3 nanoparticles, prepared by a flame synthesis process, were characterized by X-ray diffraction, transmission electron microscopy, and electron energy loss spectroscopy. Monoclinic nanoparticles were formed when the flame temperature was sufficiently high; lower temperatures led to the formation of the normal cubic (C-type) phase. We explain the formation of the uncommon monoclinic phase on the basis of pressure,temperature phase equilibria, and the extra internal pressure induced by surface curvature of the nanoparticles. [source] | ||||||||||