XPS characterization of SmNbO4 and SmTaO4 precursors prepared by sol-gel method
Source abstract
Abstract
Abstract Samarium niobate SmNbO4 (SNO) and tantalate SmTaO4 (STO) precursors were prepared by sol-gel method and annealing at 1000 °C. The different polymorphs, orthorhombic and monoclinic SmNbO4 or tetragonal SmTa7O19 and monoclinic SmTaO4 were identified. Structural properties of precursors were investigated by the X-ray photoelectron spectroscopy (XPS). Core-level XPS studies of sol-gel SNO and STO were performed for the first time. The binding energy differences Δ(O Nb) = BE (O 1s) – BE (Nb 3d5/2) and Δ(O Ta) = BE (O 1s) – BE (Ta 4f7/2) were used as suitable parameter to characterize average Nb O bonding in SNO (323.1 eV) and Ta O bonding in STO (503.9 eV). The Sm 3d5/2 peak consists of strong features characteristic for Sm3+ (1083.0 eV) with (4f5) electron configuration and Sm2+ (1072 eV) with (4f6) electron configuration. The molar concentration of Sm3+ in SNO and STO was higher (21.0 and 24.7 at.%) than Sm2+ in SNO (1.0 at.%) and STO (0.3 at.%). The XPS demonstrated two valence states of Sm in precursors for application as nanophosphors for lighting and display technologies.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electronic and Structural Properties of Oxides · Luminescence Properties of Advanced Materials · Ferroelectric and Piezoelectric Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
Show source-provided references
1. Structural and electronic parameters of complex niobates and tantalates10.7763/IJAPM.2011.V1.8 ↗
2. Transparent glass-ceramics with (Eu3+, Yb3+):YNbO4 nanocrystals: crystallization, structure, optical spectroscopy and cooperative upconversion10.1016/j.jlumin.2016.06.042 ↗
3. Effect of the processing parameters on the crytalline structure of lanthanide orthotantalates10.1590/S1516-14392013005000189 ↗
4. Nb 3d and O 1s core levels and chemical bonding in niobates10.1016/j.elspec.2004.10.003 ↗
5. Chemical bonding in photocatalytic niobates and tantalates
6. The investigation of NbO2 and Nb2O5 electronic structure by XPS, UPS and first principles methods10.1002/sia.5253 ↗
7. Thin Ta2O5 films on Si by XPS10.1116/1.1323656 ↗
8. XPS investigation of monatomic and cluster argon ion sputtering of tantalum pentoxide10.1016/j.apsusc.2017.02.006 ↗
9. Electronic structure of selected ternary samarium compounds
10. The electronic structure of rare-earth oxides in the creation of the core hole10.1016/S0301-0104(99)00380-8 ↗
11. Thermo-coloration of SmS thin flims by XPS in situ observation10.1016/S0169-4332(03)00373-8 ↗
12. Controlled self-assembly of Sm2O3 nanoparticles into nanorods: simple and large scale synthesis using bulk Sm2O3 powders10.1021/jp804030m ↗
13. Temperature-induced structural evolution of Sm nanoparticles on Al2O3 thin film: An in-situ investigation using SRPES, XPS and STM10.1016/j.apsusc.2016.11.145 ↗
14. Evidence for perimeter sites over SmOx-modified Rh(100) surface by CO chemisorption10.1016/j.susc.2004.07.021 ↗
15. Effect of lanthanides on phase transformation and structural properties of LnNbO4 and LnTaO4 thin films10.1016/j.matdes.2017.08.068 ↗
16. High-Resolution X-ray photoemission spectrum of the valence bands of gold10.1103/PhysRevB.5.4709 ↗
17. Hartree-slater subshell photoionization cross-sections at 1254 and 1487 eV10.1016/0368-2048(76)80015-1 ↗
18. X-ray photoelectron spectroscopy of Sm-doped layered perovskite for intermediate temperature-operating solid oxide fuel cell10.1016/j.apsusc.2013.10.107 ↗
19. Growth, structural and thermophysical properties of TbNbO4 crystals10.1039/C7CE02072D ↗
20. Fabrication of Ta2O5 films on tantalum substrate for efficient photocatalysis10.1016/j.catcom.2015.02.006 ↗
21. XPS study of N2 annealing effect on thermal Ta2O5 layers on Si10.1016/j.apsusc.2003.09.040 ↗
22. Optical properties and microstructure of plasma deposited Ta2O5 and Nb2O5 films10.1116/1.1851544 ↗
23. Cathodoluminescent stability of rare earth tantalate phosphors10.1016/j.jlumin.2013.02.051 ↗
24. Molten salt synthesis of NaNbxTa1-xO3 perovskites with enhanced photocatalytic activity10.1016/j.cplett.2017.08.029 ↗
25. Mechanochemical preparation of nanocrystalline BaFCl doped with samarium in the 2+ oxidation state10.1021/ic500712b ↗
26. Preparation of Sm–Ru bimetallic alloy films on Ru(0001) surface by vapour-deposition and annealing10.1007/BF02704005 ↗
27. 3d x-ray- absorbtion lines and the 3d94fn+1 multiplets of the lanthanides10.1103/PhysRevB.32.5107 ↗
28. Temperature quenching of luminescence emission in Eu3+- and Sm3+-doped YNbO4 powders10.1016/j.jlumin.2014.02.008 ↗
29. Morpho-structural and luminescent investigations of niobium activated yttrium tantalate powders10.1016/j.jallcom.2008.04.009 ↗
30. Solid-state optical maser using divalent Samarium in Calcium fluoride10.1147/rd.51.0056 ↗
31. Luminescence properties of Sm2+-activated barium chloroborates10.1016/S0022-2313(02)00665-8 ↗
32. Reduction effect on the optical properties of Sm2+ doped in SrB4O7 and SrB6O10 crystals10.1016/j.jpcs.2006.05.020 ↗
33. Structural defects and luminescence properties of Sm2+ ions doped in BaBPO5 phosphor by X-ray irradiation10.1016/j.jallcom.2008.11.016 ↗
34. Synthesis and Sm2+/Sm3+ doping effects on photoluminescence properties of Sr4Al14O2510.1016/j.jlumin.2011.05.060 ↗