Mallinson, CFCFMallinsonGray, BMBMGrayHector, ALALHectorMcLachlan, MAMAMcLachlanOwen, JRJROwen2015-06-042013-09-032015-06-042013-09-03Inorganic Chemistry, 2013, 52 (17), pp.9994-99991520-510Xhttp://hdl.handle.net/10044/1/23411Reactions of Ta(NMe2)5 and n-propylamine are shown to be an effective system for sol-gel processing of Ta3N5. Ordered macroporous films of Ta3N5 on silica substrates have been prepared by infiltration of such a sol into close-packed sacrificial templates of cross-linked 500 nm polystyrene spheres followed by pyrolysis under ammonia to remove the template and crystallize the Ta3N5. Templates with long-range order were produced by controlled humidity evaporation. Pyrolysis of a sol-infiltrated template at 600 °C removes the polystyrene but does not crystallize Ta3N5, and X-ray diffraction shows nanocrystalline TaN plus amorphous material. Heating at 700 °C crystallizes Ta3N5 while retaining a high degree of pore ordering, whereas at 800 °C porous films with a complete loss of order are obtained.© 2013 American Chemical Society. Published under a Creative Commons CC BY licence.CrystallizationNitrogen CompoundsPhase TransitionPolystyrenesPorosityPropylaminesSilicon DioxideTantalumJournal Articlehttps://www.dx.doi.org/10.1021/ic40127181520-510X