Chemical Stability and Crystallographic Analysis of the the Sr2HoNbO6 Cubic Perovskite as Potential Substrate for YBa2Cu3O7-δ Superconducting Films

Abstract

The Sr 2 HoNbO 6 complex perovskite has been synthesized by solid-state reaction. X-ray diffraction pattern reveals that Sr 2 HoNbO 6 material crystallizes in a cubic structure, Fm3̅ m space group, lattice constant a=8.018 Å, which has a lattice mismatch ~3% with YBa 2 Cu 3 O 7-δ . The chemical stability of Sr 2 HoNbO 6 with YBa 2 Cu 3 O 7-δ superconducting has been studied by x-ray diffraction and measurements of magnetization as a function of temperature on Sr 2 HoNbO 6 -YBa 2 Cu 3 O 7-δ composites. X-ray diffraction patterns of the composite shown that all the X-ray diffraction peaks could be indexed for either Sr 2 HoNbO 6 or YBa 2 Cu 3 O 7-δ with no extra peak detectable. This result implies that these compounds remain as two different separate phases in the composite with no chemical interaction. Magnetic response shows that superconducting transition temperature of pure YBa 2 Cu 3 O 7-δ and Sr 2 HoNbO 6 -YBa 2 Cu 3 O 7-δ composites is 93,5 K. These favorable characteristics of Sr 2 HoNbO 6 show that it can be used as a potential substrate material for growth of YBa 2 Cu 3 O 7-δ superconducting films.

Suitability of Sm3+-Substituted SrTiO3 as Anode Materials for Solid Oxide Fuel Cells: A Correlation between Structural and Electrical Properties

“…The investigation of chemical stability for the reduced compositions was performed by XRD measurements and microstructural studies. From the results as reported in Figure 9, it was found that the XRD patterns of the samples SST5, SST10, SST15, and SST20 show similarity with earlier samples, and no signature of structural and chemical degradations was observed [60,61]. Additionally, FESEM images of corresponding reduced compositions (inset in Figure 9) also confirm that the microstructure was not modified by reduction.…”

“…The investigation of chemical stability for the reduced compositions was performed by XRD measurements and microstructural studies. From the results as reported in Figure 9, it was found that the XRD patterns of the samples SST5, SST10, SST15, and SST20 show similarity with earlier samples, and no signature of structural and chemical degradations was observed [60,61]. Therefore, both extrinsic defects, caused by the Sm doping at the Sr-site and intrinsic oxygen vacancies [59], formed under the reducing conditions, subsidize the formation of electrons and the increase of electrical conductivity.…”

Structure and Physical Properties of the LaBiFe2O6 Perovskite Produced by the Modified Pechini Method

“…So far, there are very few reports of double perovskites produced through this technique [6][7] . Double perovskites are materials extensively studied due to the potential that their generic formula AA'MM'O 6 , where A-and A'-cation, and M-and M'-cations can be the same or different type, provides to modify the structure and, consequently, the physical properties of this family of compounds, by introducing various elements in sites A and M of that formula [8][9] . The novel double perovskite material LaBiFe 2 O 6 has recently been reported as a possible biferroic with ferromagnetic and ferroelectric response at room temperature 10 .…”