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perovskite-structures
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Relationship between young’s modulus and planar density of unit cell, super cells (2 × 2 × 2), symmetry cells of perovskite (catio3) lattice
, Article Materials ; Volume 14, Issue 5 , 2021 , Pages 1-15 ; 19961944 (ISSN) ; Palevicius, A ; Nasiri, S ; Dashti, A ; Vilkauskas, A ; Janusas, G ; Sharif University of Technology
MDPI AG
2021
Abstract
Calcium titanate-CaTiO3 (perovskite) has been used in various industrial applications due to its dopant/doping mechanisms. Manipulation of defective grain boundaries in the structure of perovskite is essential to maximize mechanical properties and stability; therefore, the structure of perovskite has attracted attention, because without fully understanding the perovskite structure and diffracted planes, dopant/doping mechanisms cannot be understood. In this study, the areas and locations of atoms and diffracted planes were designed and investigated. In this research, the relationship between Young’s modulus and planar density of unit cell, super cells (2 × 2 × 2) and symmetry cells of nano...
Comparison of microstructure and hydrogen permeability of perovskite type ACe0.9 Y0.1 O3-δ (A is Sr, Ba, La, and BaSr) membranes
,
Article
International Journal of Hydrogen Energy
;
Volume 40, Issue 20
,
2015
,
Pages 6559-6565
;
03603199 (ISSN)
; Safekordi, A
; Zamaniyan, A
; Ganji Babakhani, E
; Amanipour, M
;
Sharif University of Technology
Abstract
Hydrogen permeation through ACe0.9 Y0.1 O3-δ (A = Sr, Ba, La, and BaSr) perovskite-type membranes was studied at high temperatures. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were used to characterize phase structure and phase stability of the membrane. The XRD results showed the formation of a single phase of perovskite structure with configuration orthorhombic for BCY and BSCY membranes. Based on the TGA results, it was found that the phase stability increases in the order of LCY < SCY < BCY < BSCY. The microstructure examinations of the synthesized membranes studied by scanning electron microscopy (SEM) showed the formation of a dense-like...
Development of a triple-cation Ruddlesden–Popper perovskite structure with various morphologies for solar cell applications
, Article Journal of Materials Science: Materials in Electronics ; Volume 31, Issue 4 , January , 2020 , Pages 2766-2776 ; Bakhshayesh, A. M ; Khosroshahi, R ; Taghavinia, N ; Abdizadeh, H ; Sharif University of Technology
Springer
2020
Abstract
The present research sheds new light on the development of a triple-cation quasi-two-dimensional (2D) perovskite family with the general formula of (S1−xS′x)2[Cs0.05(FA1−xMAx)0.95]3Pb4(I1−xBrx)13, in which two spacers, namely 5-ammonium valeric acid iodide (S) and tetra-n-octylammonium bromide (S′) were simultaneously incorporated. Morphology, crystal structure, optical properties, photovoltaic performance, and internal resistances of such compound were systemically studied in comparison with an analogous single-cation 2D counterpart (i.e. (S)2(FA)3Pb4I13) as a reference. X-ray diffraction set forth that the films deposited based upon these compounds had a 2D perovskite crystal structure...
Two-dimensional mechanism of electrical conductivity in Gd1-xCexBa2Cu3O7-δ
, Article Journal of Physics Condensed Matter ; Volume 20, Issue 34 , 2008 ; 09538984 (ISSN) ; Mazaheri, M ; Akhavan, M ; Sharif University of Technology
2008
Abstract
Partial substitutions of Pr and Ce are known to suppress the superconducting state in REBa2Cu3O7-δ systems. We have substituted Ce for Gd in Gd1-xCexBa 2Cu3O7-δ compounds with x = 0.0-0.6 by the standard solid-state reaction technique. X-ray diffraction (XRD) experiments are performed and their results are refined by the Rietveld method. XRD analysis shows a predominantly single-phase perovskite structure with few impurity phases. Our resistivity results show that, by increasing the Ce content, Tc decreases, the transition temperature width increases, and in the normal state a metal-insulator transition (MIT) occurs at x c = 0.12. The normal state resistivity of the samples and their slopes...
Design, modeling and optimization of a piezoelectric pressure sensor based on thin-film PZT diaphragm contain of nanocrystalline powders
, Article 2009 6th International Symposium on Mechatronics and its Applications, ISMA 2009, Sharjah, 23 March 2009 through 26 March 2009 ; 2009 ; 9781424434817 (ISBN) ; Sheikhi, M. H ; Torkian, S ; Barzegar, A ; Masumi, E ; Mohammadi, S ; Sharif University of Technology
2009
Abstract
In this paper fabrication of a 0-3 ceramic/ceramic composite lead zirconate titanate, Pb(Zr0.52Ti0.48)O3 thin film has been presented and then a pressure sensor based on multilayer thin-film PZT diaphragm contain of Lead Zirconate Titanate nanocrystalline powders was designed, modeled and optimized. This multilayer diaphragm in general acts as sensor or actuator. ANSYS was used for simulation of diaphragm. Dynamics characteristics of this multilayer diaphragm have been investigated. By this simulation the effective parameters of the multilayer PZT diaphragm for improving the performance of a pressure sensor in different ranges of pressure are optimized. The optimized thickness ratio of PZT...