title: [Application of infrared absorption spectroscopy to examination of drugs and their preparations. XXI. Determination of the mixture of polymorphic forms of silicon dioxide (cristobalite and quartz) by potassium bromide disc method].
mesh_terms: D001965:Bromides; D003460:Crystallization; D003734:Dental Casting Investment / Q000032:analysis*; D007259:Infrared Rays; D010087:Oxides / Q000032:analysis; D011188:Potassium; D012825:Silicon / Q000032:analysis*; D012822:Silicon Dioxide / Q000032:analysis*; D013057:Spectrum Analysis
chemical_list: D001965:Bromides; D003734:Dental Casting Investment; D010087:Oxides; D012822:Silicon Dioxide; D011188:Potassium; D012825:Silicon