A new two-dimensional polyoxoniobate built by Lindqvist-type polyoxoanion and copper coordinated cations K2[Cu(H2O)6]{[Nb6O19][Cu(NH3)]2}·8H2O

Successive protonation of Lindqvist hexaniobate, [Nb6O19]8−: electronic properties and structural distortions

“…20 The maximum position of these two low-energy bands is also in excellent agreement with the experimental values mentioned in the Introduction section. 18,19 The highest energy transition (170.5 nm) seems to occur between orbitals with significant contributions of both Nb and O b atoms.…”

Sodium‐potassium niobate nanorods with various crystal structures and their application to nanogenerator

“…The absorption bands at 1419 and 2356 cm −1 can be ascribed to the CO 2 adsorbed on the specimen surface . Moreover, the absorption band at 842 cm −1 could be attributed to [Nb 6 O 19 ] 8− , which can be seen in (K 8−8 x Na 8 x )Nb 6 O 19 ·H 2 O (KNNH) precursor . Therefore, the RH NKN nanorods contained a small amount of KNNH.…”

Structural and Piezoelectric Properties of (Na1−xKx)NbO3 Platelets and Their Application for Piezoelectric Nanogenerator

“…These absorption peaks did not appear in the spectra of specimens synthesized at 600°C for 12 h, suggesting that the NKN platelets synthesized at 500°C and 600°C for 6 h contained a small amount of both OH − and water. The absorption band at 842 cm −1 could be attributed to [Nb 6 O 19 ] 8− , which can be observed in the KNNH precursor . Therefore, it is considered that the platelets annealed at 500°C for 1 h still contained a small amount of KNNH.…”

“…The absorption band at 842 cm À1 could be attributed to [Nb 6 O 19 ] 8À , which can be observed in the KNNH precursor. [31][32][33] Therefore, it is considered that the platelets annealed at 500°C for 1 h still contained a small amount of KNNH. In addition, the absorption band at 1412 cm À1 can be ascribed to CO 2 adsorbed on the surface of the specimen.…”