Synthesis of anatase nanoparticles with extremely wide solid solution range and ScTiNbO6 with α-PbO2 structure

Hydrothermal Synthesis of Nb‐ and Eu‐ Co‐Substituted Nanocrystalline Anatase: EuxTi1–2xNbxO2 with Photoluminescence and Photocatalytic Activity: Compositional Dependence of Multifunctional Properties

“…To attain the crystallite growth the same as the anatase with pure TiO 2 composition, much higher heating temperature more than 200°C was necessary for the anatase in the samples with composition Eu x Ti 1–2 x Nb x O 2 , which is considered to be the cause of the enhancement of the phase stability of anatase. A single phase of rutile‐type M x Ti 1–2 x Nb x O 2 (M = Eu) is not formed through the phase transformation in the same composition range as the cases of co‐dopant M = Sc, Al, and Ga, which may be due to a little larger ionic radius of Eu(III) than that of Sc(III), Al(III), and Ga(III) …”

“…Especially, it has been discovered that the anatase directly formed using hydrothermal method through the co-substitution of the Ti(IV) site with Nb(V) and Sc(III) has wide solid solution range (Sc x Ti 1-2x Nb x O 2 , x = 0~0.33). 21 A single phase of anatase with composition ScTiNbO 6 in this system transforms into a single phase of a-PbO 2 structure without phase transformation into rutile phase via heat treatment at 900°C in air. 22 The anatase-type solid solutions Y x Ti 1-2x Nb x O 2 co-substituted with Nb(V) and yttrium (Y(III)) are also effective for the improvement of the phase stability of anatase-type titania.…”

“…11 This attention exists owing to electronic configuration of 3d 0 and the corresponding control and tunability of its electronic properties such as conductivity and optical band gap by introducing dopant materials and electronic defects through the substitution of the Ti(IV) site with several dopant ions. 9,[12][13][14][15][16][17][18][19][20][21][22][23][24] In general, the metastable phase, e.g., anatase can substitute with larger amount of dopants than the stable one, e.g., rutile. The effect of substitution with trivalent cations: aluminum (Al) and gallium (Ga) into TiO 2 on the morphology and microstructural properties of nanopowders has been reported.…”

Hydrothermal synthesis of yttrium and niobium co-doped anatase-type titania nanoparticles

“…It has been reported that anatase nanoparticles Sc X Ti 1¹2X Nb X O 2 with wide solid solution range (X = 00.33) and anatas-type ScTiNbO 6 can be hydrothermally formed by substitutional co-doping of niobium and scandium. 34) However there have been few reports on the synthesis of anatase-type titania co-doped with niobium and yttrium. From the technological standpoint, retaining the materials properties of nanoscale catalysts that operate at high temperatures is important.…”

Titania solid solution nanoparticles co-doped with niobium and gallium

“…20) The investigations on the formation, phase stability, and photoactivity of anatase-type TiO 2 solid solutions doped with niobium 21), 22) and co-doped with niobium and scandium (Sc X Ti 1¹2X Nb X O 2 ) have been done. 23), 24) The effect of co-doping niobium and aluminum into TiO 2 on the synthesis and properties of nanoparticles has also been investigated. 25) In that report, the starting temperature of anatase-torutile phase transformation has been delayed by co-doping niobium and aluminum into TiO 2 , and anatase-type solid solutions Al X Ti 1¹2X Nb X O 2 (X = 00.2) with improved photocatalytic activity have been formed.…”