Synthesis of  by the Flux Method

Maruyama, Yuki; Izawa, Chihiro; Watanabe, Tomoaki

doi:10.5402/2012/170362

Cited by 9 publications

(5 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the orthorhombic system, (NbO 6 ) polyhedron alternate with bismuth atoms in a planar manner [42], with a relatively large cell volume, (~330 Å 3 ). Whereas in the triclinic phase, such alternating occur in a distorted manner, and the cell volume is smaller than that of the orthorhombic system (about 324 Å 3 ) [43]. Based on our findings, there is a direct correlation between band gap of prepared BiNbO and lattice volume; as the lattice volume increases the band gap decreases.…”

Section: Uv-vis Drssupporting

confidence: 52%

Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes

2019

View full text Add to dashboard Cite

α- and β-BiNbO4 nanoparticles were successfully prepared using three different routes, namely co-precipitation, hydrothermal, and citrate precursor methods. Structural characterization has been analyzed using powder X-ray diffraction where results confirmed the mixed-phase nature of the prepared powders. When co-precipitation method is applied, BiNbO4 prepared at pH 2 and calcined at 750 °C shows predominately the α-BiNbO4 owning the narrowest band gap of 2.86 eV, whereas an increase in the pH value resulted in the β-BiNbO4 phase being the predominant phase. On the other hand, samples prepared using citrate precursor method show co-existence of both α- and β-BiNbO4 at all pH values under study; however, at pH 10 the β-BiNbO4 was the dominant phase exhibiting a higher bandgap energy value of 3.16 eV. When applying the hydrothermal approach, BiNbO4 prepared at all pH ranges of the present study show a band gap >3.2 eV indicating their activity in the ultraviolet region of the spectrum. Moreover, increasing calcination temperature to 900 °C, a gradual transformation of α- to β was observed. Lastly, it was noticed that as the lattice volume increases, the band gap of prepared BiNbO4 decreases.

show abstract

Section: Uv-vis Drssupporting

confidence: 52%

Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes

2019

View full text Add to dashboard Cite

show abstract

“…BaMO 4 (M = Mo, W) have been prepared using alkaline metal nitrates as fluxes at 400-550°C; nice rhombic-shaped crystals with a size of 50 μm and mostly exposing (111) faces were formed (Figure 1.1) [29]; the crystal size can be controlled through the reaction temperature and the time and nature of the alkaline metal nitrate flux. A low temperature phase of BiNbO 4 using a Bi 2 O 3 -B 2 O 3 eutectic flux was prepared by Maruyama et al [30] at 800°C, 100°C below the temperature required in the conventional ceramic method; the particles were also more crystalline.…”

Section: Flux Methodsmentioning

confidence: 99%

Pigments Based on Perovskite

Ardit

Cruciani

Dondi

et al. 2015

Perovskites and Related Mixed Oxides

View full text Add to dashboard Cite

“…The temperature of transition from α-BiNbO 4 to β-BiNbO 4 is in the range of 1020-1040 °C. 4,5) The relative dielectric constants of α-BiNbO 4 and β-BiNbO 4 are approximately 45 and 30, respectively. [6][7][8][9] Bi 5 N 3 O 15 has an orthorhombic structure and a relative dielectric constant of about 70.…”

Section: Introductionmentioning

confidence: 99%

High-relative-dielectric-constant bismuth–niobium–oxide films prepared using Nb-rich precursor solution

Ariga

Inoue

Matsumoto

et al. 2015

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

Various ceramic materials have been developed for electronic devices. Bismuth-niobium-oxide (BNO) films prepared by a chemical solution deposition (CSD) method have the cubic pyrochlore phase, high relative dielectric constant, and low tangent loss (tan δ). We found that a BNO cubic pyrochlore crystal was Nb-rich, even though its pyrochlore formula is A 2 B 2 O 7 . The crystallization temperature of BNO increased with increasing Nb ratio. The relative dielectric constants of BNO films were related to the Nb ratio in the precursor solution. The dielectric constant of the BNO films was 250 when the Bi and Nb ratios in BNO precursor solutions were 4 and 6, respectively, and the sintering temperature was 600°C. In addition, the tan δ was less than 0.01 at 1 kHz, which is higher than the reported values of BNO systems despite using the CSD method. These results show that the properties of BNO films prepared by the CSD method were associated with the Nb ratio in the precursor solution. Furthermore, the dielectric characteristics indicated that the Nb-rich BNO films have potential applications in electronic devices.

show abstract

Synthesis of by the Flux Method

Cited by 9 publications

References 20 publications

Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes

Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes

Pigments Based on Perovskite

High-relative-dielectric-constant bismuth–niobium–oxide films prepared using Nb-rich precursor solution

Contact Info

Product

Resources

About