Solution Combustion Synthesis Route Research Articles

XRD and UV-Vis diffuse reflectance analysis of CeO2-ZrO2 solid solutions synthesized by combustion method

A series of ceria-incorporated zirconia (Ce1−xZrxO2,x = 0 to 1) solid solutions were prepared by employing the solution combustion synthesis route. The products were characterized by XRD and UV-Vis-NIR diffuse reflectance spectroscopy. The materials are crystalline in nature and the lattice parameters of the solid solution series follow Vegard’s law. Diffuse reflectance spectra of the solid solutions in the UV region show two intense bands at 250 and 297 nm which are assigned respectively to Ce3+ ← O2−and Ce4+ ← O2− charge transfer transitions. The two vibrational bands in 6960 cm−1 and 5168 cm−1 in the NIR region indicate the presence of surface hydroxyl groups on these materials.

Observation of diffuse electron scattering in Sr- and Mg-doped LaGaO 3

Electron microscope images and diffraction patterns have been recorded of several crystalline samples of La 1− x Sr x Ga 1− y Mg y O 3−( x+ y)/2 prepared through a novel solution combustion synthesis route. In addition to the sharp Bragg reflexions, diffuse reflexions including some hitherto unreported features indicating the presence of microdomains embedded in the average cubic perovskite matrix were obtained. An attempt has been made to identify the microdomain structure using diffraction evidence from coarsened samples and an analogy with stabilized zirconia has been drawn.