Synthesis of homogeneous (Na1-xKx)NbO3 nanorods using hydrothermal and post-heat treatment processes

Hai Bo Xu, Mi Ri Joung, Jin Seong Kim, Sahn Nahm, Min Gyu Kang, Chong Yun Kang, Seok Jin Yoon

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17 Citations (Scopus)


To synthesize (Na1-xKx)NbO3 nanorods, the Nb2O5-added (1-y)NaOH-yKOH specimens with 0.0≤y≤0.9 were heated at 160°C and subsequently annealed at 500°C. Homogeneous Na-rich (Na1-xKx)NbO3 nanorods were only synthesized for the specimen with y=0.15. However, NaNbO3 nanorods were formed for specimens with y<0.15, and K-rich (Na1-xKx)NbO3 nanoplates were obtained for specimens with y>0.2. The (Na8xK8-8x)Nb6O19{dot operator}nH2O transient phase was formed in the specimen with y=0.15 heated at 160°C for 8.0-12.0h, and this phase transformed into the Na-rich (Na1-xKx)NbO3 nanorods after annealing at 500°C. Therefore, the formation of a homogeneous (Na8xK8-8x)Nb6O19{dot operator}nH2O phase at a low temperature is very important for the synthesis of the (Na1-xKx)NbO3 nanorods. The (Na8xK8-8x)Nb6O19{dot operator}nH2O phase was considerably influenced by the heating temperature, and the processing time. The Na-rich (Na1-xKx)NbO3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [001].

Original languageEnglish
Pages (from-to)16-21
Number of pages6
JournalChemical Engineering Journal
Publication statusPublished - 2012 Nov 15


  • (NaK)NbO{dot operator}nHO phase
  • Hydrothermal processes
  • Lead-free piezoelectric materials
  • Piezoelectric nanogenerator

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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