11. Heating the nitrate in air at 400 �C converts it to the white protactinium pentoxide . 12. The pentoxide can be reduced to antimony metal by heating with hydrogen or potassium cyanide. 13. This can cause some conversion of amorphous tantalum pentoxide to the more conductive crystalline form. 14. Shcherbinaite, a naturally occurring mineral form of vanadium pentoxide , is named for him. 15. Both types use niobium pentoxide ( Nb 2 O 5 ) as the dielectric layer. 16. In niobium electrolytic capacitors the dielectric is niobium pentoxide ( Nb 2 O 5 ). 17. Vanadium pentoxide is used in ceramics. 18. It is manufactured industrially on a large scale from phosphorus trichloride and oxygen or phosphorus pentoxide . 19. Iodine pentoxide decomposes to iodine ( vapor ) and oxygen when heated to about 350 �C. 20. Besides this pentoxide there is an additional niobium suboxide, niobium dioxde ( NbO 2 ).
