Synthesis, growth mechanism and optical properties of (K,Na)NbO3 nanostructures

Flower-like porous hematite nanoarchitectures achieved by complexation–mediated oxidation–hydrolysis reaction

“…Two main approaches are generally developed to fabricate these structures. One depends on templates of self-assembled organic media [11,[17][18][19], while the other utilizes either the special properties of organic solvents which influence the nucleation and growth of nanostructures [3][4][5]20,21] or the anisotropic properties of crystal nucleation and growth [8,12,22,23]. Most approaches either encounter the inevitable complexity of removing the template or rely on organic compounds unfriendly to the environment.…”

“…Recent successes in the chemical production of hierarchical structures composed of nanoscaled building blocks, such as nanoflakes [1][2][3][4][5], nanowires [6][7][8], nanorods [9][10][11][12], nanobelts [13][14][15], nanotubes [16], have received much attention in the light of their high specific surface area and novel optical, electronic, optoelectronic, catalytic and absorption properties. Two main approaches are generally developed to fabricate these structures.…”

Synthesis, characterization and ferroelectric properties of lead-free K0.5Na0.5NbO3 nanotube arrays

“…11,12 In another study, Ahn et al examined the effects of K and Na excess on the ferroelectric and piezoelectric properties of (K,Na)NbO 3 thin films, and the results showed that the optimized (K,Na)NbO 3 thin film showed good fatigue resistance with a piezoelectric constant of 40 pm/V, which is comparable to that of a polycrystalline PZT thin film. 13 The effects of grains size on the dielectric response of KNN ceramics have also been studied by Buixaderas et al 14 With the rapid development of nanoscale technologies and devices, the properties exhibited in ferroelectric nanomaterials are quite different from those in bulk.…”

Fabrication and properties of Na0.9K0.1NbO3 nanostructures by molten salt synthesis

“…It can be referred that K + ions enter into the lattice of NaNbO 3 and the substitution of K + with larger ionic radius (1.64 Å, 12-coordinated) to that of Na + (1.39 Å, 12-coordinated) results in the peak shift towards lower angles. Further, the lattice parameters of the prepared compound have been refined, and the calculated parameters (a = 5.5732 Å, b = 15.6250 Å, c = 5.5422 Å) were lower than the reported Na 0.5 K 0.5 NbO 3 [18],but close to pure NaNbO 3 powder (a = 5.5625 Å, b = 15.5495 Å, c = 5.5138 Å). This result reveals that the actual Na + ions content in the prepared compound were higher than 0.5 in Na 0.5 K 0.5 NbO 3 .…”