Stabilization of cubic phase in scandium‐doped zirconia nanocrystals synthesized with sol‐gel method

Abstract

A new room‐temperature synthesis of nanocrystals of scandium‐doped zirconium oxide by sol‐gel method is reported. The structure of the obtained product is checked with standard structural analysis methods. The crystal phase of ZrO2‐Sc2O3 nanocrystals changes from monoclinic to tetragonal and cubic with the increase in scandium concentration. The importance of the cubic phase, which appears at 10 mol% and refines at 16 mol% of Sc2O3 concentration, is emphasized. The UV‐Vis absorption spectra of the product are measured, and its bandgap is evaluated from the fundamental absorption edge. The value of the bandgap was calculated as 5.65 eV for the cubic phase.

Preparation and heat-insulating properties of Al2O3–ZrO2(Y2O3) hollow fibers derived from cogon using an orthogonal experimental design

“…Furthermore, a band at 269 cm À1 that only relates to t-ZrO 2 moved to a shorter wavelength in the presence of Al 2 O 3 . 29 It is noticeable that the peak at 639 cm À1 has higher intensity than that at 462 cm À1 in t-ZrO 2 , while the opposite is true when it comes to c-ZrO 2 . 27,30 Moreover, when x(Al 2 O 3 ) ¼ 0.70, two major crystalline structures of ZrO 2 can be successfully distinguished from their Raman intensities.…”

Triple-Wavelength Lasing with a Stabilized β-LaBSiO5:Nd3+ Crystal

“…The challenge is two-fold, first is controlling or eliminating the phase transition of β-LBSO on cooling to room temperature and the second is growing large β-LBSO single crystals. The strategies such as strain adjustment, grain size control, annealing process, and doping are commonly used to manipulate the phase composition or phase transition of functional materials such as VO 2 , TiO 2 , and ZrO 2 . The metal–insulator transition (MIT) temperature of the VO 2 film could be lowered from 68 to 31 °C by adjusting the strain/stress between the film and the substrate .…”

“…Meanwhile, one can make the high-temperature cubic phase ZrO 2 stable even at room temperature by doping Sc 3+ ions or controlling the grain size at the nanometer level. The tuning of phase transitions in the above materials is related to modification of the lattice energy and the appearance of the intermediate phase . However, for the β-LBSO single crystal, strain adjustment and grain size regulation are not applicable to eliminate the phase transition.…”

Green Synthesis of Silver Nanoparticles Coated by Water Soluble Chitosan and Its Potency as Non-Alcoholic Hand Sanitizer Formulation

“…Various metal nanoparticles have previously been fabricated using top-down approaches, such as mechanical milling [14,15]), etching [16], laser ablation [17], sputtering [18], and electro-blasting [19]. Bottom-up approaches to the synthesis of nanostructures have included the synthesis of supercritical fluids [20], the use of templates [21], sol-gel processes [22], laser pyrolysis [23], molecular condensation [24], chemical reduction [25,26] and green synthesis [27][28][29].…”