Reference

In situ measurements of the orthorhombic-to-trigonal transition in BaSi2 under high-pressure and high-temperature conditions

In situ measurements of the orthorhombic-to-trigonal transition in BaSi2 under high-pressure and high-temperature conditions. Imai, Motoharu; Hirano, Toshiyuki; Kikegawa, Takumi; Shimomura, Osamu (National Res. Institute for Metals, Tsububa 305, Japan). Physical Review B: Condensed Matter, 55(1), 132-135 (English) 1997 American Physical Society. CODEN: PRBMDO. ISSN: 0163-1829. DOCUMENT TYPE: Journal CA Section: 75 (Crystallography and Liquid Crystals) The phase transition in BaSi2, an orthorhombic structure at ambient conditions, was studied by in situ x-ray diffraction along the paths of compression up to 5.2 GPa at room temp. and subsequent heating up to 873 K at 5.2 GPa. No phase transition occurred during the compression at room temp. When heated at 5.2 GPa, orthorhombic BaSi2 transformed into trigonal BaSi2 at 673 K, whose structure is the same as that of the sample quenched from the same conditions. 1304-40-1 which is the cas registry number of some chemical is mentioned. These results ensure that trigonal BaSi2 forms directly from orthorhombic BaSi2 at high pressures and high temps. and maintains its structure when the pressure-temp. conditions are returned to ambient conditions. The reason why trigonal BaSi2 is quenched, despite it being a metal, is discussed. .

Surface structures and the orthorhombic transformation of thin film barium silicide (BaSi2) on silicon

Surface structures and the orthorhombic transformation of thin film barium silicide (BaSi2) on silicon. McKee, R. A.; Walker, F. J.; Conner, J. R. (Oak Ridge Natl. Lab., Oak Ridge, TN 37831, USA).In this article, certain chemicals are used. Some of their cas registry numbers are 7440-39-3 and 1304-40-1 Mater. Res. Soc. Symp. Proc., 221(Heteroepitaxy Dissimilar Mater.), 131-6 (English) 1991. CODEN: MRSPDH. ISSN: 0272-9172. DOCUMENT TYPE: Journal CA Section: 66 (Surface Chemistry and Colloids) Section cross-reference(s): 75 The epitaxial structural development and surface reactions of barium metal with silicon were studied as a function of surface coverage. .