Hydrothermal synthesis and visible-light-driven photocatalytic degradation for tetracycline of Mn-doped SrTiO3 nanocubes

We performed laser ablation of doped oxides, Y2O3:Eu3+, Gd2O3:Eu3+, and Y3Al5O12:Ce3+ (YAG:Ce), in an aqueous solution of 2-[2-(2-methoxyethoxy)ethoxy]acetic acid (MEEAA). Nanoparticles are produced and characterized using electron microscopy and luminescence spectroscopy. We show that the polyether chain ensures the stabilization of the objects formed in aqueous medium while the complexing group limits their size and sharpens the size distribution. The nanoparticles produced from the sesquioxide targets are in a “cubic disordered” phase as expected for very small particles. The ablation of the YAG target leads to a majority of α-Al2O3 and YAG nanoparticles and a minority of YAlO3 nanoparticles. Infrared spectroscopy is used to characterize the nature of the complex formed between the ligand and the particle surface. We demonstrate that the coordination mode of the carboxylate (−COO−) group to metal ions of the nanoparticles' surface is the bridging bidentate mode.

Synthesis of Oxide Nanoparticles by Pulsed Laser Ablation in Liquids Containing a Complexing Molecule: Impact on Size Distributions and Prepared Phases

Optical properties of Ho3+ ions in lead phosphate glasses

The vacuum referred binding energies of electrons in divalent and trivalent lanthanide impurity states and host band states in the rare earth (RED La, Gd, Y, Lu, Sc) orthophosphates REPO4, orthoborates REBO3, aluminum perovskites REAlO3, and sesqui-oxides RE2O3 have been determined by combining the recently developed chemical shift model with spectroscopic data from the archival literature. The main trends in impurity and host band level locations with changing type of RE, which determines the site size, and with changing P, B, Al, or RE cation, which determines the strength of bonding with the oxygen ligands, are identified. Sc 3C -based compounds are characterized by a relatively low energy for the conduction band bottom, or equivalently a high electron affinity, which is attributed to a relatively strong electron bonding in the 3d-shell of Sc 2C . (Some figures may appear in colour only in the online journal)

http://iopscience.iop.org/article/10.1088/0953-8984/25/22/225501/pdf

The electronic level structure of lanthanide impurities in REPO4, REBO3, REAlO3, and RE2O3 (RE = La, Gd, Y, Lu, Sc) compounds.

Polycrystalline lead-free Sodium Bismuth Titanate (NBT) ferroelectric ceramics doped with rare earth (RE) element are prepared using solid state reaction method. Optical, ferroelectric, and electrocaloric properties were investigated. The introduction of RE3+ ions in the NBT host lattice shows different light emissions over the wavelength range from visible to near infrared region. The ferroelectric P-E hysteresis loops exhibit an antiferroelectric-like character near room temperature indicating possible existence of a morphotropic phase boundary. The enhanced electrocaloric response was observed in a broad temperature range due to nearly merged phase transitions. Coexistence of optical and electrocaloric properties is very promising for photonics or optoelectronic device applications.

Electrocaloric effect and luminescence properties of lanthanide doped (Na1/2Bi1/2)TiO3 lead free materials

Growth and anisotropic spectral properties of Er:YAlO3 crystal

Ho:YAlO3 (YAP) crystal with large size and good optical quality has been grown by the Czochralski method. Thermal properties of the as-grown Ho:YAP crystal have been investigated by measuring the temperature-dependent, anisotropic thermal expansion, specific heat, thermal diffusion, and thermal conductivity. The results show that Ho:YAP crystal possesses a large anisotropic thermal expansion and good thermal conductivity. The calculated average thermal expansion coefficients along a, b, and c axis are αa=9.18×10−6/K, αb=1.94×10−6/K, and αc=7.61×10−6/K from 293.15 to 770.15 K. The thermal conductivities along a, b, and c axis are up to 11.6, 9.9, and 12.3 W m−1 K−1 at 298.15 K. Compared with Ho: Y3Al5O12 (YAG), Ho:YAP crystal has a larger thermal conductivity along a axis from 298.15 to 568.15 K.

Growth and anisotropic thermal properties of biaxial Ho: YAlO3 crystal

The defect formation energies and electronic structures of Mn doped strontium titanate have been studied using CRYSTAL-09 code. The defect formation energies for Mn Sr and Mn Ti, under different chemical potential conditions, have been obtained to determine the way Mn prefers to occupy in the Mn doped SrTiO 3 crystal. From the electronic structures of Mn doped SrTiO 3 , it is shown that Mn Sr cannot change the band gap of SrTiO 3 . However, Mn Ti can effectively reduce the band gap of SrTiO 3 and improve the photocatalysis.

Jianyu Chen

Papers

Growth and anisotropic spectral properties of Er:YAlO3 crystal

Growth and anisotropic thermal properties of biaxial Ho: YAlO3 crystal

Study on Mn-doped SrTiO3 with first principle calculation

Effects of growth atmosphere and annealing on luminescence efficiency of YAP:Ce crystal

Luminescence and defect studies of YAlO3:Dy3+,Sm3+ single crystals exposed to 100 MeV Si7+ ion beam