Emergence of Quenched Disorder as a Dominant Control for Complex Phase Diagram of Rare-earth Nickelates

2021 ◽  
Author(s):  
Gulloo Lal Prajapati ◽  
SARMISTHA DAS ◽  
Dhanvir Rana
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
Quenched Disorder ◽  
Complex Phase

The Effect of R-Site Quenched Disorder on the Electronic Phase Diagram for A-Site Ordered RBaMn2O6 (R = Rare-Earth Elements)

2019 ◽  
Vol 88 (10) ◽  
pp. 104706
Author(s):  
Norihisa Tanikawa ◽  
Hiroki Takada ◽  
Miyuki Hori ◽  
Masaya Uchida ◽  
Daisuke Akahoshi ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Quenched Disorder ◽  
Electronic Phase ◽  
Electronic Phase Diagram ◽  
A Site

scholarly journals H−T phase diagram of rare-earth–transition-metal alloys in the vicinity of the compensation point

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
M. D. Davydova ◽  
K. A. Zvezdin ◽  
J. Becker ◽  
A. V. Kimel ◽  
A. K. Zvezdin
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
Transition Metal ◽  
Compensation Point ◽  
Metal Alloys ◽  
Transition Metal Alloys ◽  
T Phase

scholarly journals Phase Stability of Nanocrystalline Grains of Rare-Earth Oxides (Sm2O3 and Eu2O3) Confined in Magnesia (MgO) Matrix

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2201
Author(s):  
Chen Barad ◽  
Giora Kimmel ◽  
Hagay Hayun ◽  
Dror Shamir ◽  
Kachal Hirshberg ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
Mixed Oxides ◽  
Sol Gel ◽  
Equilibrium Phase ◽  
Cubic Phase ◽  
Direct Heating ◽  
Pure Oxide ◽  
Heat Treated ◽  
Heating Treatment

Rare-earth (RE) oxides are important in myriad fields, including metallurgy, catalysis, and ceramics. However, the phase diagram of RE oxides in the nanoscale might differ from the phase diagrams for bulk, thus attracting attention nowadays. We suggest that grain size in the nanoscale also determines the obtained crystallographic phase along with temperature and pressure. For this purpose, nanoparticles of Sm2O3 and Eu2O3 were mixed in an inert MgO matrix via the sol-gel method. This preparation method allowed better isolation of the oxide particles, thus hindering the grain growth process associated with increasing the temperature. The mixed oxides were compared to pure oxides, which were heat-treated using two methods: gradual heating versus direct heating to the phase transition temperature. The cubic phase in pure oxides was preserved to a higher extent in the gradual heating treatment compared to the direct heating treatment. Additionally, in MgO, even a higher extent of the cubic phase was preserved at higher temperatures compared to the pure oxide, which transformed into the monoclinic phase at the same temperature in accordance with the phase diagram for bulk. This indicates that the cubic phase is the equilibrium phase for nanosized particles and is determined also by size.

scholarly journals Complete phase diagram of rare-earth nickelates from first-principles

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Julien Varignon ◽  
Mathieu N. Grisolia ◽  
Jorge Íñiguez ◽  
Agnès Barthélémy ◽  
Manuel Bibes
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
First Principles ◽  
Complete Phase Diagram

scholarly journals Investigation of the Direction of Spontaneous Magnetisation at 0 K in HoCo2 and TmFe2

2015 ◽  
Vol 20 (1) ◽  
pp. 62
Author(s):  
Carlo Carboni ◽  
Eman Al-Abri
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Rare Earth ◽  
Phase Boundary ◽  
Electrostatic Interactions ◽  
Laves Phase ◽  
Continuous Transition ◽  
Orientation Boundary ◽  
Binary Compounds ◽  
Laves Phase Compounds

The direction of spontaneous magnetisation at 0 K across a phase orientation boundary in rare-earth laves phase compounds is computed as a function of the ratio of magnetic to electrostatic interactions. The phase boundary and range of parameters used for the computation correspond to the portion of the orientational phase diagram where experimental data can be obtained. In the series of pseudo-binary compounds (Gdx Ho1-x )Co2 and (Yx Ho1-x )Co2 the range of parameters covers the continuous transition from the <100> to the <110> orientations. The nmr measurements on this series show that the direction of spontaneous magnetisation is at intermediate orientation between the <100> and <110> directions. The material TmFe2, which is in the vicinity of a discontinuous orientational boundary, is also discussed.  

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