Effect of mechanochemical activation on the synthesis of NaNbO3 and processing of environmentally friendly piezoceramics

Hungrı́a, Teresa; Pardo, L.; Moure, A.; Castro, A.

doi:10.1016/j.jallcom.2004.10.067

Cited by 32 publications

(28 citation statements)

References 31 publications

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“…The effort for substituting lead containing piezoelectric compounds such as lead zirconium titanates (PZTs) has been driven forward energetically in recent years [1][2][3][4][5][6]. High piezoelectric performance of {(K 0.50 ,Na 0.50 ) 1−x Li x } (Nb 1−y Ta y )O 3 ceramics were reported at the morphotropic phase boundary between an orthorhombic and tetragonal modification of this mixed crystal system [2].…”

Section: Introductionmentioning

confidence: 99%

Noncentrosymmetric phase of submicron NaNbO3 crystallites

et al. 2007

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The temperature and pressure characteristics of a noncentrosymmetric crystal modification of NaNbO 3 were studied by Raman spectroscopy. A transition towards the bulk-like structure of NaNbO 3 occurs in the temperature range from 280 to 360°C. High-pressure Raman spectroscopy revealed successive pressure-induced phase transitions at around 2, 6.5 and 10 GPa. Raman scattering profiles recorded above 7 GPa correspond to those reported for the bulk. The temperature-induced spectral changes were completely reversible between −150 and 450°C. Those induced by pressure were almost reversible from ambient pressure up to 15.9 GPa. Piezoresponse force microscopy demonstrated the occurrence of piezoelectric activity for submicron NaNbO 3 crystals with particle size ranging from 200 to 400 nm. The noncentrosymmetric crystallographic structure plays a critical role for the enhancement of piezoelectricity.

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Section: Introductionmentioning

confidence: 99%

Noncentrosymmetric phase of submicron NaNbO3 crystallites

et al. 2007

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“…The NN nanoparticle synthesized by the solvothermal method is effective to synthesize the NN ceramics with piezoelectric property at low temperature. However, the d 33 is slightly lower than those fabricated by using the NN particle synthesized by the conventional solid-state reaction method (3040 pC/N), 25), 26) hot pressing (2440 pC/N), 27) and molten salt synthesis method (28 pC/N). 28) This low d 33 value is because the polarization treatment is deficient at present polarization condition.…”

Section: Resultsmentioning

confidence: 86%

“…25), 26) The d 33 value of this NN ceramics was 17 pC/N. The NN nanoparticle synthesized by the solvothermal method is effective to synthesize the NN ceramics with piezoelectric property at low temperature.…”

Section: Resultsmentioning

confidence: 90%

Fabrication of lead-free piezoelectric NaNbO<sub>3</sub> ceramics at low temperature using NaNbO<sub>3</sub> nanoparticles synthesized by solvothermal method

Fukada

Shibata

Imai

et al. 2013

J. Ceram. Soc. Japan

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NaNbO 3 (NN) nanoparticles were successfully synthesized by solvothermal method at 315°C. Some particles have column-like morphology and the others have sphere morphology. The average particle sizes of column-like and sphere particle are 13 and 47 nm, respectively. The NN particles synthesized by the solvothermal method were much smaller than those (average particle size was 590 nm) fabricated by the conventional solid-state method. High-dense (relative density: 95.4%) NN ceramics could be fabricated at low temperature (1150°C) in air using NN nanoparticles obtained by solvothermal synthesis. This sintering temperature is much lower than that (>1350°C) using NN particles obtained by the conventional solid-state reaction method. The fabricated NN ceramics from NN nanoparticles showed a piezoelectric property (d 33 = 17 pC/N).

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“…NN is usually fabricated via a solid-state reaction between Na 2 CO 3 and Nb 2 O 5 [7,[25][26][27]. This classical method involves a high temperature (above 700°C) and long reaction time, which can lead to the volatilization of Na 2 O and the formation of undesirable secondary phases.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, contamination is always introduced into the high-quality ceramics during the ballmilling process in this method. Similarly, the ball-milling technique is also involved in mechanochemical activation, combustion and reaction-sintering methods which use Nb 2 O 5 as raw material [27,[29][30][31][32]. It is well known that niobic acid (Nb 2 O 5 ÁxH 2 O) is a more active compound compared with Nb 2 O 5 .…”

Section: Introductionmentioning

confidence: 99%

A facile synthesis of NaNbO3 powders by decomposition of ammonium niobium oxalate with sodium salt at low temperature

Zhai

Jiang

et al. 2010

Res Chem Intermed

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A facile synthesis of NaNbO 3 powders was performed by solid-state reaction at low temperature. Stoichiometric ammonium niobium oxalate and Na 2 CO 3 were mixed in water and then calcined at different temperatures for various times after drying. A combination of X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectroscopy and thermogravimetric (TG) analysis was used to characterie the product and precursor compound. The XRD patterns show that single-phase NaNbO 3 powders with high crystallinity can be synthesized at 425°C for 15 min. The particle size from XRD data is found to be about 40 nm for NaNbO 3 powders calcined at 500°C for 3 h, which is in good agreement with SEM data. The SEM photograph shows that NaNbO 3 powders are cuboid-like and well crystallized when calcination at 800°C for 3 h. The product compositions prepared using other sodium reactants, such as HCOONa and NaNO 3 , are also discussed.

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Effect of mechanochemical activation on the synthesis of NaNbO3 and processing of environmentally friendly piezoceramics

Cited by 32 publications

References 31 publications

Noncentrosymmetric phase of submicron NaNbO3 crystallites

Noncentrosymmetric phase of submicron NaNbO3 crystallites

Fabrication of lead-free piezoelectric NaNbO<sub>3</sub> ceramics at low temperature using NaNbO<sub>3</sub> nanoparticles synthesized by solvothermal method

A facile synthesis of NaNbO3 powders by decomposition of ammonium niobium oxalate with sodium salt at low temperature

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