Global Barium Fluoride Market By Type (Ammonium , Hydrogen Fluoride , Calcium Fluoride , Sodium Fluoride , Sulphur Hexafluoride , and Others), By Application (Aluminum Metallurgy , Optical Material , Oil Refining , Spectroscopic Components , Pharmaceuticals , Food , and Others), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029