In situ Raman spectroscopy of cubic boron nitride to 90GPa and 800K

AbstractThe temperature and pressure dependences of the Raman spectrum of the transverse-optical mode of cubic boron nitride were calibrated for applications to a Raman spectroscopy pressure sensor in optical cells to about 800K and 90GPa. A significant deviation from linearity of the pressure dependence is confirmed at pressures above 20GPa. At ambient temperature, dv/dP slopes are 3.41(7) and 2.04(7) cm−1/GPa at 0 and 90GPa, respectively. A polynomial expression is used to fit the pressure–temperature dependence of the Raman line. The pressure dependence does not significantly change with temperature, as determined from experiments conducted up to 800K. At 0GPa, the dv/dP slope is 3.46(7)cm−1/GPa at 800K. At pressures above 90GPa, the Raman spectrum of the transverse-optical mode cannot be observed because of an overlap of the signals of cubic boron nitride and diamond used as the anvils in the high-pressure cell

「点と線」に注目した沈み込み帯の火山とテクトニクス

Anomalous arc volcanoes tend to exist where a linear topographic feature （fracture zone, line of seamounts, or ridge） on the oceanic plate is subducting. “Dots-and-lines tectonics” are proposed for clarifying this tendency and understanding the mechanisms that generate it. Stateof-the-art studies on along-arc variations of volcanism around the Pacific ring of fire and possible effects of inhomogeneities on the subducting oceanic plate are reviewed. Mechanisms generating the clustered distribution of active volcanoes in North-eastern Japan and the extraordinary volcanism at Mount Fuji are reconsidered from a “dots-and-lines” tectonics point of view. Although there still remain many unsolved problems, “dots-and-lines” tectonics could offer a unified explanation of along-arc variations in volcanism, combining processes in mid-ocean ridges, hot spots, and subduction zones.Fil: Ichihara, Mie. The University Of Tokyo; JapónFil: Adam, Claudia. Kansas State University; Estados UnidosFil: Vidal, Valérie. Université Claude Bernard Lyon 1; FranciaFil: Grosse, Pablo. Fundación Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Mibe, Kenji. The University Of Tokyo; JapónFil: Orihashi, Yuji. The University Of Tokyo; Japó