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In Situ Observation of Dehydration-Induced Phase Transformation from Na2Nb2O6-H2O to NaNbO3
- In Situ Observation of Dehydration-Induced Phase Transformation from Na2Nb2O6-H2O to NaNbO3
- Jung, JH[Jung, Jong Hoon]; Chen, CY[Chen, Chih-Yen]; Wu, WW[Wu, Wen-Wei]; Hong, JI[Hong, Jung-Il]; Yun, BK[Yun, Byung Kil]; Zhou, YS[Zhou, Yusheng]; Lee, N[Lee, Nuri]; Jo, W[Jo, William]; Chen, LJ[Chen, Lih-Juann]; Chou, LJ[Chou, Li-Jen]; Wang, ZL[Wang, Zhong Lin]
- DGIST Authors
- Hong, JI[Hong, Jung-Il]
- Issue Date
- Journal of Physical Chemistry C, 116(42), 22261-22265
- Article Type
- Activation Energy; Arrhenius Equation; Atomic Rearrangements; Dehydration; High Temperature; Hydrothermal Process; In-Situ; In-Situ Observations; Kinetic Control; Lead-Free; Lead Oxide; Molecular Sieves; Nanowires; Niobates; Niobium; Niobium Compounds; Octahedral Molecular Sieves; Oxide Nanostructures; Phase Transitions; Piezoelectricity; Real-Time; Sodium; Transmission Electron Microscopy; Transmission Electron Microscopy Tem; X Ray Diffraction
- We have monitored the phase transformation from a Sandia octahedral molecular sieve Na 2Nb 2O 6-H 2O to a piezoelectric NaNbO 3 nanowire through in situ X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements at high temperatures. After dehydration at 288 °C, the Na 2Nb 2O 6-H 2O becomes significantly destabilized and transforms into NaNbO 3 with the increase of time. The phase transformation time is exponentially proportional to the inverse of temperature, for example, ∼10 5 s at 300 °C and ∼10 1 s at 500 °C, and follows an Arrhenius equation with the activation energy of 2.0 eV. Real time TEM investigation directly reveals that the phase transformation occurs through a thermally excited atomic rearrangement due to the small difference of Gibbs free energy between two phases. This work may provide a clue of kinetic control for the development of high piezoelectric lead-free alkaline niobates and a deep insight for the crystallization of oxide nanostructures during a hydrothermal process. © 2012 American Chemical Society.
- American Chemical Society
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