Direct fabrication and nitridation of a high-quality NaTaO3 crystal layer onto a tantalum substrate

作者：Suzuki Sayaka; Teshima Katsuya^*; Yubuta Kunio; Ito Shun; Moriya Yosuke; Takata Tsuyoshi; Shishido Toetsu; Domen Kazunari; Oishi Shuji

来源：CrystEngComm, 2012, 14(21): 7178-7183.

DOI：10.1039/c2ce25901j

High-quality nano-/microtextured NaTaO3 crystal layers were successfully fabricated on Ta substrates at a relatively low temperature using molten NaNO3 as the starting material. Ta substrates coated with an aqueous NaNO3 solution were heated at 500 degrees C in an infrared heating furnace, whereupon Ta reacted with NaNO3 (which acted as both the Na source and the flux) to afford a layer of densely packed cubic NaTaO3 crystals that adhered readily onto the substrate. Nitridation of the NaTaO3 crystal layer by heating at 850 degrees C under an NH3 flow yielded a Ta3N5 crystal layer. The crystals retained their original size and shape but became highly porous after nitridation. TEM observations clearly indicated that the porous cubic crystals consisted of highly crystalline nanoparticles.

• 出版日期2012