WBarium titanate
WBismuth germanate
WCadmium zinc telluride
WGallium(II) selenide
WLithium iodate
WLithium niobate
WLithium tantalate
WLithium triborate
WMonopotassium phosphate
WNitrobenzene
WPotassium dideuterium phosphate
WPotassium niobate
WPotassium titanyl phosphate
WTellurium dioxide
WYttrium iron garnet
WZinc oxide
WZinc telluride