An aqueous solution-gel method for low temperature synthesis of nanocrystalline NaNbO3 and their ceramics

Liu, Weihong; Wang, Hong; Li, Kecheng

doi:10.1007/s10971-010-2238-1

Cited by 14 publications

(4 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous investigations revealed that the absorption peaks at 1340, 1523 and 1655 cm À1 , which are momentously higher in the spectrum of NaNbO 3 -organic, should be attributed to the absorptions of carbonate ions. 26,27 The absorptions of carbonate ions appearing in the spectrum of NaNbO 3 -inorganic are possibly generated from the remaining carbonate on the surface, which was produced by the oxidation of the organic compounds.…”

Section: Journal Of Materials Chemistry a Papermentioning

confidence: 99%

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Ouyang

Zhang

et al. 2013

J. Mater. Chem. A

View full text Add to dashboard Cite

Section: Journal Of Materials Chemistry a Papermentioning

confidence: 99%

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Ouyang

Zhang

et al. 2013

J. Mater. Chem. A

View full text Add to dashboard Cite

“…Moreover, for the reason that important ceramic physical properties such as sintered density, chemical homogeneity, and electrical properties are affected by the final crystallite powder, much attention has been devoted to the synthesis of NaNbO 3 powders using different methods. A number of chemical routes, such as hydrothermal synthesis, sol–gel processes, the use of polymeric precursors (the Pechini method), sugar‐PVA matrix method, or mechanochemical synthesis have been used to synthesize NaNbO 3 nanomaterials. In all these methods, the complicated solution processes, toxic precursors and calcination at more or less high temperature were needed to obtain pure crystallized NaNbO 3 , inevitable involving the formation of hard aggregates, which are unfavorable for sintering densified ceramics.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Piezoelectricity of NaNbO₃ High‐Density Ceramics by Molten Salt Synthesis

Hou

Xia

et al. 2011

J. Am. Ceram. Soc.

View full text Add to dashboard Cite

Nanostructures of crystalline orthorhombic sodium niobate (NaNbO 3 ) were synthesized by a molten salt synthesis procedure. As a comparison, an auxiliary experiment via conventional solid state reaction process was carried out simultaneously. The microstructure and morphology evolution of the synthesized nano particles were investigated in detail, and on the basis of the experimental results, an in situ transformation mechanism has been proposed to elucidate the formation processes of NaNbO 3 microstructures. It was found that both the initial shape of the Nb 2 O 5 and the dissolution rate of the initial precursors critically determine the final shapes of the products. Furthermore, the determined electrical properties of the as-obtained products indicated that NaNbO 3 ceramic derived from nanostructures holds the real characteristic of ferroelectric and the polarization-electric field (P-E) hysteresis behavior is greatly influenced by the polarization treatment. The obtained NaNbO 3 ceramic after the polarizing treatment exhibited piezoelectric property, d 33 = 28 pC/N.

show abstract

“…These studies reveal that any change in the ε r (T) is accompanied by a definite change in the thermodynamic order parameter of the investigated system. A weak broad exothermic hump just above 1200 K may arise due to sodium volatilization in NNO [27][28][29][30][31].…”

Section: Resultsmentioning

confidence: 99%

Thermal hysteresis and vibrational excitations in NiO containing NaNbO₃

George

Dar

Joshi

et al. 2019

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A systematic study of the dielectric hysteresis and temperature-dependent vibrational excitations of NiO containing antiferroelectric (AFE) NaNbO 3 composites is reported. The Mott insulator NiO plays a significant role in the crystal structure of NaNbO 3 . In particular, for low and moderate substitutions of NiO, a transition from orthorhombic to monoclinic symmetry is evident at room temperature. The temperature dependence of the relative dielectric permittivity, ε r (T), exhibits an anomalous change in its magnitude across three distinct phase transitions of NaNbO 3 at 449 K, 665 K and 751 K. These are, respectively, associated with a second-order phase transition occurring due to incommensurate phase between two orthorhombic AFE orderings, change from the orthorhombic P-to R-phase (T P-R ) without altering the AFE structure and an orthorhombic R-to S-phase transition accompanied by an AFE to paraelectric transition. A large thermal hysteresis (∆T hys ∼ 38 K) was evident in ε r and ac resistivity (ρ ac ) between the temperatures 473 K and 673 K signifying the firstorder nature of the T P-R transition. At room temperature, for higher NiO content, a new mode centred at 838 cm −1 was observed in the Raman spectra along with a two-magnon mode at 1496 cm −1 , a broad longitudinal optical mode (2LO) at 1096 cm −1 and a weak translational optical mode (2TO) at 726 cm −1 . At low temperatures, down to 80 K, several peculiar features are evident in the Raman spectra of NbO 6 octahedra which are associated with the structural and antiferromagnetic transition of NaNbO 3 and NiO, respectively.

show abstract

An aqueous solution-gel method for low temperature synthesis of nanocrystalline NaNbO3 and their ceramics

Cited by 14 publications

References 24 publications

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Preparation and Piezoelectricity of NaNbO₃ High‐Density Ceramics by Molten Salt Synthesis

Thermal hysteresis and vibrational excitations in NiO containing NaNbO₃

Contact Info

Product

Resources

About

An aqueous solution-gel method for low temperature synthesis of nanocrystalline NaNbO3 and their ceramics

Cited by 14 publications

References 24 publications

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO3and their photocatalytic properties

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO3and their photocatalytic properties

Preparation and Piezoelectricity of NaNbO3 High‐Density Ceramics by Molten Salt Synthesis

Thermal hysteresis and vibrational excitations in NiO containing NaNbO3

Contact Info

Product

Resources

About

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Surface-coordination-induced selective synthesis of cubic and orthorhombic NaNbO₃and their photocatalytic properties

Preparation and Piezoelectricity of NaNbO₃ High‐Density Ceramics by Molten Salt Synthesis

Thermal hysteresis and vibrational excitations in NiO containing NaNbO₃