Influence of A-site cation size-disorder on structural, magnetic and magnetocaloric properties of La0.7Ca0.3−xKxMnO3 compounds

2007 ◽  
Vol 440 (1-2) ◽  
pp. 36-42 ◽  
Author(s):  
M. Bejar ◽  
E. Dhahri ◽  
E.K. Hlil ◽  
S. Heniti
Keyword(s):  
Magnetocaloric Properties ◽  
A Site ◽  
Cation Size

Effects of A-site cation disorder on structure and magnetocaloric properties in Y and Sr codoped La2∕3Ca1∕3MnO3 compounds

2009 ◽  
Vol 105 (7) ◽  
pp. 07D713 ◽  
Author(s):  
Qing Ji ◽  
Bin Lv ◽  
P. F. Wang ◽  
H. L. Cai ◽  
X. S. Wu ◽  
...  
Keyword(s):  
Cation Disorder ◽  
Magnetocaloric Properties ◽  
A Site

Hydrothermal synthesis of ABi2Ta2O9Aurivillius phase: A comparative study of A-site cation size on structure, dielectric, optical properties

2021 ◽  
Author(s):  
Ilona Bella ◽  
Tio Putra Wendari ◽  
Novesar Jamarun ◽  
Nandang Mufti ◽  
Zulhadjri
Keyword(s):  
Xrd Analysis ◽  
Aurivillius Phase ◽  
Hydrothermal Route ◽  
Orthorhombic Crystal ◽  
Ionic Radii ◽  
Aurivillius Phases ◽  
Orthorhombic Crystal Structure ◽  
A Site ◽  
Cation Size ◽  
Ferroelectric Transition Temperature

In this study, the double-layered Aurivillius phases CaBi2Ta2O9 (CBT) and PbBi2Ta2O9 (PBT) were prepared through a hydrothermal route with NaOH as a mineralizer. XRD analysis confirmed that the CBT and PBT compounds were successfully formed and adopted an orthorhombic crystal structure with an [Formula: see text]21am symmetry. Le Bail refinements of XRD data indicated that the unit cell volume of CBT was smaller than PBT and is associated with the smaller ionic radius of Ca[Formula: see text] compared to Pb[Formula: see text]. The surface morphology of both samples, as determined using SEM, demonstrated plate-like grains with anisotropic grain growth. It was found that the different ionic radii of [Formula: see text]-site cations (Ca[Formula: see text] and Pb[Formula: see text] strongly affected the structural, optical and electrical properties of the Aurivillius phase. The occupation of smaller Ca[Formula: see text] cations induced a higher structural distortion, which resulted in higher bandgap ([Formula: see text] energy and ferroelectric transition temperature ([Formula: see text] of CBT, compared to those of PBT.

Magnetocaloric properties of the A-site co-doping double-perovskite of Sr2FeMoO6

2018 ◽  
Vol 466 ◽  
pp. 133-137 ◽  
Author(s):  
Yanchun Hu ◽  
Tengyu Guo ◽  
Xianwei Wang ◽  
Yawen Cui ◽  
Weixia Li ◽  
...  
Keyword(s):  
Double Perovskite ◽  
Co Doping ◽  
Magnetocaloric Properties ◽  
A Site

Magnetocaloric Properties of A-Site-Doped La2NiMnO6 for Environmentally Friendly Refrigeration

2020 ◽  
Author(s):  
E. Meher Abhinav ◽  
D. Jaison ◽  
Anuraj Sundararaj ◽  
Gopalakrishnan Chandrasekaran ◽  
S. V. Kasmir Raja
Keyword(s):  
Environmentally Friendly ◽  
Magnetocaloric Properties ◽  
A Site

Enhancement in magnetocaloric properties of ErCrO3 via A-site Gd substitution

2018 ◽  
Vol 123 (19) ◽  
pp. 193901 ◽  
Author(s):  
Jianhang Shi ◽  
Shiqi Yin ◽  
Mohindar S. Seehra ◽  
Menka Jain
Keyword(s):  
Magnetocaloric Properties ◽  
A Site

scholarly journals Structural and Electrical Properties of Ca2+ Doped LaFeO3: The Effect of A-site Cation Size Mismatch

2020 ◽  
Vol 10 (2) ◽  
pp. 5538-5546
Author(s):  
A. E. Irmak
Keyword(s):  
Crystal Structure ◽  
Sol Gel ◽  
Charge Ordering ◽  
Room Temperature Resistivity ◽  
Size Mismatch ◽  
Ca Doping ◽  
Average Size ◽  
A Site ◽  
Cation Size ◽  
Small Polarons

In this study, nanosized La1-xCaxFeO3 (0.00≤x≤0.40) compounds prepared via sol-gel method followed by heat treatment at 1100oC for 24 hours are studied. Crystal structure, microstructure, surface morphology and temperature-dependent resistivity of the samples are investigated. TEM investigation reveals nanoparticles with an average size of 35nm produced from the sol-gel process. The crystal structure of the compounds belongs to an orthorhombically distorted perovskite structure with Pbnm space group. Lattice distortion and cation size mismatch increase with an increase in Ca and particle and grain growth are suppressed by Ca doping. Electrical conduction is explained via thermally activated hopping of small polarons. Unit cell volume, charge ordering temperature, and activation energy for small polarons decrease linearly with an increase in cation size mismatch. Room temperature resistivity decreases with Ca doping and gets its minimum value for 30% Ca at which the orthorhombic distortion is maximum.

Effect of A-site-substitution on structural, magnetic and magnetocaloric properties in La0.7Sr0.3 Mn0.9Cu0.1O3 manganite

2019 ◽  
Vol 491 ◽  
pp. 165540 ◽  
Author(s):  
E. Bouzaiene ◽  
A.H. Dhahri ◽  
J. Dhahri ◽  
E.K. Hlil ◽  
Abdullah Bajahzar
Keyword(s):  
Magnetocaloric Properties ◽  
A Site
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