DEWAR FLASK, PHOTOLUMINESCENCE MEASUREMENT DEVICE, CONCENTRATION MEASUREMENT METHOD, AND SILICON MANUFACTURING METHOD

A significant reduction in the burden on an evacuation operator and a significant reduction in evacuation cost are achieved when the concentration of impurities included in silicon are measured in liquid helium by a photoluminescence method. A glass which serves as a material for forming an inner cy...

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Bibliographische Detailangaben
Hauptverfasser:	SAKAI, Junya, YAMAMOTO, Tomohiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS BLASTING CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY COLD ROOMS COMBINED HEATING AND REFRIGERATION SYSTEMS COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR ELECTRICITY FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES FIXED-CAPACITY GAS-HOLDERS GLASS HEAT PUMP SYSTEMS HEATING ICE-BOXES INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES JOINING GLASS TO GLASS OR OTHER MATERIALS LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MEASURING MECHANICAL ENGINEERING METALLURGY MINERAL OR SLAG WOOL PHYSICS REFRIGERATION OR COOLING REFRIGERATORS SEMICONDUCTOR DEVICES STORING OF DISTRIBUTING GASES OR LIQUIDS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TESTING VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES WEAPONS
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Beschreibung
Zusammenfassung:	A significant reduction in the burden on an evacuation operator and a significant reduction in evacuation cost are achieved when the concentration of impurities included in silicon are measured in liquid helium by a photoluminescence method. A glass which serves as a material for forming an inner cylinder Dewar flask (2) has an SiOz content of 65% by weight to 75% by weight, and has an average thermal expansion rate of 25 × 10-7/°C to 55 × 10-7/°C when the temperature of the glass is 20°C to 300°C. (Fig. 2)