Non-percolating small metallic clusters and sharp suppression of metallicity in RE0.55Sr0.45Mn1−xRuxO3manganites

2018 ◽  
Vol 20 (4) ◽  
pp. 2431-2437 ◽  
Author(s):  
H. S. Alagoz ◽  
I. Živković ◽  
K. H. Chow ◽  
J. Jung
Keyword(s):  
Phase Transition ◽  
Ferromagnetic Metal ◽  
Metallic Clusters ◽  
A Site ◽  
Sharp Phase Transition

The origin of the anomalous sharp phase transition from a ferromagnetic metal into a ferromagnetic insulator has been investigated in ruthenium (Ru)-doped RE0.55Sr0.45Mn1−xRuxO3(0 ≤x≤ 0.25) manganites (RESRMO) with RE(A-site) = Sm, Eu and Gd.

A-site cation with high vibrational motion in ABX3 perovskite effectively induces dielectric phase transition

2021 ◽  
Author(s):  
Yu-Zhen Wang ◽  
Zhi-Xu Zhang ◽  
Chang-Yuan Su ◽  
Tie Zhang ◽  
Da-Wei Fu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Vibrational Motion ◽  
Dielectric Phase ◽  
Hybrid Perovskite ◽  
Perovskite Material ◽  
A Site

A hybrid perovskite material with dielectric phase transition obtained by the introduction of a moving group.

Influence of light on the antiferromagnetic-insulator—ferromagnetic-metal phase transition in Pr0.6La0.1Ca0.3MnO3 thin films

2004 ◽  
Vol 30 (12) ◽  
pp. 948-955 ◽  
Author(s):  
P. Aleshkevych ◽  
M. Baran ◽  
R. Szymczak ◽  
H. Szymczak ◽  
V. A. Bedarev ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Ferromagnetic Metal ◽  
Metal Phase ◽  
Metal Phase Transition

Mn-Mg disordering in cummingtonite: a high-temperature neutron powder diffraction study

2000 ◽  
Vol 64 (2) ◽  
pp. 255-266 ◽  
Author(s):  
J. J. Reece ◽  
S. A. T. Redfern ◽  
M. D. Welch ◽  
C. M. B. Henderson
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
New York ◽  
High Temperature ◽  
Powder Diffraction ◽  
Elevated Temperatures ◽  
Neutron Powder Diffraction ◽  
Site Preference ◽  
A Site

AbstractThe crystal structure of a manganoan cummingtonite, composition [M4](Na0.13Ca0.41Mg0.46Mn1.00) [M1,2,3](Mg4.87Mn0.13)(Si8O22)(OH)2, (Z = 2), a = 9.5539(2) Å, b = 18.0293(3) Å, c = 5.2999(1) Å, β = 102.614(2)° from Talcville, New York, has been refined at high temperature using in situ neutron powder diffraction. The P21/m to C2/m phase transition, observed as spontaneous strains +ε1 = −ε2, occurs at ˜107°C. Long-range disordering between Mg2+ and Mn2+ on the M(4) and M(2) sites occurs above 550°C. Mn2+ occupies the M(4) and M(2) sites preferring M(4) with a site-preference energy of 24.6±1.5 kJ mol−1. Disordering induces an increase in XMnM2 and decrease in XMnM4 at elevated temperatures. Upon cooling, the ordered states of cation occupancy are ‘frozen in’ and strains in lattice parameters are maintained, suggesting that re-equilibration during cooling has not taken place.

scholarly journals Concentration-driven phase transition and self-assembly in drying droplets of diluting whole blood

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anusuya Pal ◽  
Amalesh Gope ◽  
John D. Obayemi ◽  
Germano S. Iannacchione
Keyword(s):  
Phase Transition ◽  
Self Assembly ◽  
Whole Blood ◽  
Morphological Analysis ◽  
Hierarchical Structures ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Colloidal Systems ◽  
Functional Complexity ◽  
Sharp Phase Transition

Abstract Multi-colloidal systems exhibit a variety of structural and functional complexity owing to their ability to interact amongst different components into self-assembled structures. This paper presents experimental confirmations that reveal an interesting sharp phase transition during the drying state and in the dried film as a function of diluting concentrations ranging from 100% (undiluted whole blood) to 12.5% (diluted concentrations). An additional complementary contact angle measurement exhibits a monotonic decrease with a peak as a function of drying. This peak is related to a change in visco-elasticity that decreases with dilution, and disappears at the dilution concentration for the observed phase transition equivalent to 62% (v/v). This unique behavior is clearly commensurate with the optical image statistics and morphological analysis; and it is driven by the decrease in the interactions between various components within this bio-colloid. The implications of these phenomenal systems may address many open-ended questions of complex hierarchical structures.

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