Synthesis of solid solutions of double-layered Ruddlesden-Popper phases in the Gd2O3-SrO-Fe2O3-Al2O3 system

Personalized energy systems based on nanostructured materials

“…The combustion method of gel-like media in high-speed kinetic mode [201,208,224,225,232,248,294] is an alternative to the described synthesis method, which proceeds in a relatively slow diffusion mode [216][217][218][219][220][221]262,293,FIG. 22.…”

“…CaCO 3 suspension in Co(NO 3 ) 2 solution was used as the initial components, and NaOH solution was used as the precipitator. Initial nanopowders in the form of solid solutions of the composition Ca This method was also used for synthesizing the samples of new materials based on perovskite-like layered compounds in the Ln 2 O 3 -MO-Al 2 O 3 system (where Ln = rare earth elements: lanthanum, scandium, yttrium, and lanthanides; M = Mg, Ca, Sr, and Ba) with the structure of the Ruddlesden-Popper phases [262][263][264]. Using a wide range of physical and chemical analysis methods, the main of which are X-ray fluorescence and X-ray spectral microanalysis, X-ray diffractometry, scanning electron microscopy, synchronous thermal analysis, pycnometry, etc., their physicochemical and functional properties were studied, and their structural features were determined (Fig.…”

Flintstone as a nanocomposite material for photonics

“…A large number of papers, both on the subject of analysis of the activation temperature in sintering and inelastic deformation of materials [139,140] and on that of the analysis of solidphase reaction mechanisms [141][142][143][144][145][146][147][148][149][150][151], show that all these solid-phase processes start in the systems only after the nonautonomous phase has transitioned to a liquid-like state, i.e., they are liquid-phase reactions in a sense, as stated in [75,78]. As another example, we can compare the findings from the study of Ruddlesden-Popper phase formation kinetics from different reagents [151][152][153][154][155][156][157][158][159][160][161][162][163][164][165][166][167][168] with data on the values of some temperature transformations in the Ln 2 O 3 -SrO-Al 2 O 3 system [169][170][171][172][173], in which the compounds are formed that are promising for the production of functional and structural high-temperature materials [174][175][176][177]…”