In situ observation of dehydration-induced phase transformation from Na 2Nb 2O 6-H 2O to NaNbO 3

Jong Hoon Jung; Chih Yen Chen; Wen Wei Wu; Jung Il Hong; Byung Kil Yun; Yusheng Zhou; Nuri Lee; William Jo; Lih Juann Chen; Li Jen Chou; Zhong Lin Wang

doi:10.1021/jp308289r

In situ observation of dehydration-induced phase transformation from Na ₂Nb ₂O ₆-H ₂O to NaNbO ₃

Jong Hoon Jung, Chih Yen Chen, Wen Wei Wu, Jung Il Hong, Byung Kil Yun, Yusheng Zhou, Nuri Lee, William Jo, Lih Juann Chen, Li Jen Chou, Zhong Lin Wang

Department of Physics

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	22261-22265
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	116
Issue number	42
DOIs	https://doi.org/10.1021/jp308289r
State	Published - 25 Oct 2012

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@article{e09f543daad14a8ea30f8ea259527855,

title = "In situ observation of dehydration-induced phase transformation from Na 2Nb 2O 6-H 2O to NaNbO 3 ",

abstract = "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.",

author = "Jung, {Jong Hoon} and Chen, {Chih Yen} and Wu, {Wen Wei} and Hong, {Jung Il} and Yun, {Byung Kil} and Yusheng Zhou and Nuri Lee and William Jo and Chen, {Lih Juann} and Chou, {Li Jen} and Wang, {Zhong Lin}",

year = "2012",

month = oct,

day = "25",

doi = "10.1021/jp308289r",

language = "English",

volume = "116",

pages = "22261--22265",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

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TY - JOUR

T1 - In situ observation of dehydration-induced phase transformation from Na 2Nb 2O 6-H 2O to NaNbO 3

AU - Jung, Jong Hoon

AU - Chen, Chih Yen

AU - Wu, Wen Wei

AU - Hong, Jung Il

AU - Yun, Byung Kil

AU - Zhou, Yusheng

AU - Lee, Nuri

AU - Jo, William

AU - Chen, Lih Juann

AU - Chou, Li Jen

AU - Wang, Zhong Lin

PY - 2012/10/25

Y1 - 2012/10/25

N2 - 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.

AB - 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.

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DO - 10.1021/jp308289r

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SN - 1932-7447

VL - 116

SP - 22261

EP - 22265

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 42

ER -

In situ observation of dehydration-induced phase transformation from Na 2Nb 2O 6-H 2O to NaNbO 3

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In situ observation of dehydration-induced phase transformation from Na ₂Nb ₂O ₆-H ₂O to NaNbO ₃