METHODS OF MANUFACTURING LOW-OXYGEN POTASSIUM TANTALATE FLUORIDE CRYSTAL AND LOW-OXYGEN POTASSIUM NIOBATE FLUORIDE CRYSTAL, THE CRYSTALS OBTAINED BY THESE METHODS, AND METHOD OF ANALYZING OXYGEN CONTAINED IN THEM

PROBLEM TO BE SOLVED: To provide a method of manufacturing a low-oxygen potassium tantalate fluoride crystal and a low-oxygen potassium niobate fluoride crystal, the crystals obtained by these methods, and a method of analyzing oxygen contained in them. SOLUTION: Thus, in a method of obtaining a cry...

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Hauptverfasser:	KINOSHITA MASANORI, UCHINO YOSHIJI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INORGANIC CHEMISTRY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING METALLURGY PHYSICS TESTING
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Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method of manufacturing a low-oxygen potassium tantalate fluoride crystal and a low-oxygen potassium niobate fluoride crystal, the crystals obtained by these methods, and a method of analyzing oxygen contained in them. SOLUTION: Thus, in a method of obtaining a crystal by cooling a saturated potassium tantalate fluoride solution under a controlled condition to form a recrystallized crystal, filtering and drying the recrystallized crystal in a dryer, the concentration of fluoric acid of the saturated potassium tantalate fluoride solution, which essentially contains fluoric acid, is regulated to be 0.5-10 mol/l.