Effect of the species of substituted ion on ferroelastic domain switching of rare-earth ion-doped ZrO2 pseudo-single crystals

1999 ◽  
Vol 14 (1) ◽  
pp. 142-145 ◽  
Author(s):  
Takanori Kiguchi ◽  
Atsushi Saiki ◽  
Kazuo Shinozaki ◽  
Nobuyasu Mizutani
Keyword(s):  
Rare Earth ◽  
Phase Separation ◽  
Single Crystals ◽  
Domain Switching ◽  
Volume Fraction ◽  
Rare Earth Ion ◽  
Microstructural Aspect ◽  
The Difference

The difference of domain switching amount of 3 mol% R2O3−ZrO2 (R = Yb, Y, Dy, Gd, Eu, Sm) pseudo-single crystals with additive cation species was investigated from the microstructural aspect. The switching amount of Yb, Y, Dy, and Gd substituted ZrO2 was three times higher than that of Eu and Sm. The amount corresponded to the volume fraction of the t′-phase, and it indicated that phase separation proceeded, especially in Eu and Sm substituted ZrO2.

Transmission Electron Microscopy (TEM) Observations of Phase-Separations of Gamma-Prime Precipitates in Ni-Al-Fe and Ni-Si-Fe Ternary Alloys

2007 ◽  
Vol 26-28 ◽  
pp. 1311-1314 ◽  
Author(s):  
M. Senga ◽  
H. Kumagai ◽  
Tomokazu Moritani ◽  
Minoru Doi
Keyword(s):  
Phase Separation ◽  
Volume Fraction ◽  
Heating Temperature ◽  
Ternary Alloys ◽  
Phase System ◽  
Precipitate Phase ◽  
Two Phase ◽  
Gamma Prime ◽  
Transmission Electron ◽  
The Difference

In Ni-13.0at%Si-3.1at%Fe alloy, when γ/γ’ two-phase microstructure formed at 1123 K is isothermally heated at 923 K which is lower than the temperature where the initial γ/γ’ microstructure forms, the phase-separation of γ/γ’ precipitate phase occurs and γ particles newly appear in each cuboidal γ’ precipitate. While in Ni-10.2at%Al-10.8at%Fe alloy, when γ/γ’ two-phase microstructure formed at 1023 K is isothermally heated at 1123 K which is higher than the temperature where the initial γ/γ’ microstructure forms, the phase-separation of γ’ precipitate phase takes place and γ particles newly appear in each cuboidal γ’ precipitate. Such appearance of new γ particles in γ’ precipitates can be explained by the difference in the volume fraction of γ phase that should exist in the γ/γ’ two-phase system depending on the heating temperature.

Electronic phase separation and other novel phenomena and properties exhibited by mixed-valent rare-earth manganites and related materials

2007 ◽  
Vol 366 (1862) ◽  
pp. 63-82 ◽  
Author(s):  
Vijay B Shenoy ◽  
C.N.R Rao
Keyword(s):  
Rare Earth ◽  
Phase Separation ◽  
Transition Metal Oxides ◽  
Rare Earth Ion ◽  
Electronic Phase Separation ◽  
Spatially Correlated ◽  
Theoretical Approaches ◽  
Electronic Phase ◽  
Different Types ◽  
Rare Earth Manganites

Transition metal oxides, such as the mixed-valent rare-earth manganites Ln (1− x ) A x MnO 3 (Ln, rare-earth ion, and A, alkaline-earth ion), show a variety of electronic orders with spatially correlated charge, spin and orbital arrangements, which in turn give rise to many fascinating phenomena and properties. These materials are also electronically inhomogeneous, i.e. they contain disjoint spatial regions with different electronic orders. Not only do we observe signatures of such electronic phase separation in a variety of properties, but we can also observe the different ‘phases’ visually through different types of imaging. We discuss various experiments pertaining to electronic orders and electronic inhomogeneities in the manganites and present a discussion of theoretical approaches to their understanding. It is noteworthy that the mixed-valent rare-earth cobaltates of the type Ln (1− x ) A x CoO 3 also exhibit electronic inhomogeneities just as the manganites.

Phase-Separation of B2 Precipitates in an Fe-Ni-Al Alloy

2010 ◽  
Vol 638-642 ◽  
pp. 2274-2278 ◽  
Author(s):  
Yasuhiro Kuno ◽  
Yasuo Nakane ◽  
Takao Kozakai ◽  
Minoru Doi ◽  
Junji Yamanaka ◽  
...  
Keyword(s):  
Free Energy ◽  
Phase Separation ◽  
Volume Fraction ◽  
Heating Temperature ◽  
Phase System ◽  
Al Alloy ◽  
Two Phase ◽  
Chemical Free Energy ◽  
The Difference ◽  
The Individual

When Fe-10.3mol%Ni-14.3mol%Al alloy is heated at 1173 K for 8.64104 s, a number of B2 precipitates are dispersed in the A2 matrix. When the two-phase microstructure of A2+B2 is aged at 973 K, the phase-separation of B2 precipitate particles takes place to form a new A2 phase in each B2 particle. In the course of further ageing at 973 K, the new A2 phase grows but decreases in number, and finally only one A2 particle is left in the individual B2 particles. The appearance of new A2 phase in each B2 precipitate is due to the difference in the volume fraction of A2 phase that should exist in A2+B2 two-phase system depending on the heating temperature: i.e., the phase-separation of B2 precipitates starts with the aid of chemical free energy.

Deformation Behavior of Fe-Al-Co Single Crystals Containing CoAl Precipitates

2014 ◽  
Vol 783-786 ◽  
pp. 2869-2874 ◽  
Author(s):  
Hiroyuki Y. Yasuda ◽  
Kentaro Soma ◽  
Yoshiaki Odawara
Keyword(s):  
Single Crystals ◽  
Deformation Behavior ◽  
Volume Fraction ◽  
High Strength ◽  
Misfit Strain ◽  
High Yield ◽  
The Matrix ◽  
Primary Slip System ◽  
The Difference ◽  
B2 Structure

The effect of the CoAl precipitates on the deformation behavior of Fe-15.0Al-15.0Co (at.%) single crystals was examined. The spherical CoAl phase with the B2 structure was precipitated in the single crystals and was stable below 974 K. The bcc matrix and CoAl phase satisfied the cube-on-cube orientation relationship with a misfit strain of 0.25%. The single crystals showed a high yield stress up to 923 K while the stress dropped at 1023 K due to the dissolution of the CoAl phase into the matrix. Moreover, the activated sip system of the crystals containing the CoAl precipitates depended strongly on loading axis. At <149> orientation, {101} <111> slip favorable for the bcc matrix and the CoAl precipitates were sheared by a pair of 1/2<111> dislocations without forming Orowan loops. The CoAl single phase was known to hardly deform by <111> slip which resulted in high strength at <149> orientation. In contrast, {010} <001> or {hk0} <001> slip favorable for the CoAl precipitates was activated at <011> orientation, although the volume fraction of the CoAl phase was very small. <001> slip was generally impossible to take place in the bcc matrix, leading to the extreme hardening. Therefore, the difference in primary slip system between the bcc matrix and CoAl precipitates was responsible for the significant precipitation hardening.

scholarly journals Magnetic Phase Diagram for Bilayer Manganites

1999 ◽  
Vol 52 (2) ◽  
pp. 255 ◽  
Author(s):  
Yutaka Moritomo
Keyword(s):  
Phase Diagram ◽  
Rare Earth ◽  
Single Crystals ◽  
Ionic Radius ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Metallic State ◽  
Antiferromagnetic State ◽  
Rare Earth Ion ◽  
Magnetic Structures

Anisotropic magnetic and transport properties as well as magnetic structures have been investigated for single crystals of bilayer manganites (La1-zNdz)2-2xSr1+2xMn2O7 as a function of doping level x and averaged ionic radius z of the rare-earth ion. We have derived a global magnetic phase diagram as a function of x and z. The ferromagnetic metallic state observed in La1·2Sr1·8Mn2O7 (x = 0· 4 and z = 0· 0) is replaced by a layered antiferromagnetic state beyond x ≥ 0·45. The phase diagram thus obtained is compared with that for the cubic manganites (La1-zNdz)1-xSrxMnO3.

Organic Lanthanide Crystals for Nano-Optics Studies

MRS Advances ◽  
2016 ◽  
Vol 1 (23) ◽  
pp. 1715-1719
Author(s):  
Rabia Hussain ◽  
Alexis Bullock ◽  
Danielle Gable ◽  
Jade Griffin ◽  
Natalia Noginova
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Single Crystals ◽  
Optical Quality ◽  
Rare Earth Ion ◽  
Thin Film Fabrication ◽  
Film Fabrication ◽  
Good Optical Quality ◽  
The Rare Earth

ABSTRACTSingle crystals of Ln(NO3)3·Bpy2 where Ln = Eu, Gd, Nd, Tm, Er, La and Yb were fabricated and characterized. Materials have good optical quality, can be excited at UV or the rare earth ion transitions, demonstrate efficient luminescence and are suitable for thin film fabrication. Fabrication approaches and possible applications are discussed.

scholarly journals Фазовые переходы и фазовые превращения в нанообластях фазового расслоения в мультиферроике ErMn-=SUB=-2-=/SUB=-O-=SUB=-5-=/SUB=-

2021 ◽  
Vol 63 (11) ◽  
pp. 1863
Author(s):  
Б.Х. Ханнанов ◽  
В.А. Санина ◽  
Е.И. Головенчиц ◽  
С.Г. Лушников
Keyword(s):  
Heat Capacity ◽  
Rare Earth ◽  
Phase Transitions ◽  
Phase Separation ◽  
Wide Temperature Range ◽  
Semiconductor Heterostructures ◽  
Self Organization ◽  
Rare Earth Ion ◽  
Orbital Contribution ◽  
Multiferroic Properties

The effect of the rare-earth ion Er3+, which has a large orbital contribution to the magnetic moment, were studied to phase transitions and phase transformations of 2D nanoregions of phase separation in the ErMn2O5 multiferroic. These nanoregions are the semiconductor heterostructures (superlattices) and are formed due to self-organization processes in the ErMn2O5 matrix. Significant effect of Er3+ ions, the moments of which are rigidly oriented along the c axis of the crystal, on the magnetic dynamics, heat capacity and multiferroic properties of layers superlattises was found at a wide temperature range 5 K - 300 K in ErMn2O5 multiferroics.

Porous Gel Coatings Obtained by Phase Separation in ORMOSIL System

2000 ◽  
Vol 628 ◽  
Author(s):  
Kazuki Nakanishi ◽  
Souichi Kumon ◽  
Kazuyuki Hirao ◽  
Hiroshi Jinnai
Keyword(s):  
Phase Separation ◽  
Reaction Time ◽  
Volume Fraction ◽  
Sol Gel ◽  
Reaction Times ◽  
Dip Coating ◽  
Coating Solution ◽  
Coating Method ◽  
Gel Phase ◽  
Dip Coating Method

ABSTRACTMacroporous silicate thick films were prepared by a sol-gel dip-coating method accompanied by the phase separation using methyl-trimethoxysilane (MTMS), nitric acid and dimethylformamide (DMF) as starting components. The morphology of the film varied to a large extent depending on the time elapsed after the hydrolysis until the dipping of the coating solution. On a glass substrate, the films prepared by early dipping had inhomogeneous submicrometer-sized pores on the surface of the film. At increased reaction times, relatively narrow sized isolated macropores were observed and their size gradually decreased with the increase of reaction time. On a polyester substrate, in contrast, micrometer-sized isolated spherical gel domains were homogeneously deposited by earlier dippings. With an increase of reaction time, the volume fraction of the gel phase increased, then the morphology of the coating transformed into co-continuous gel domains and macropores, and finally inverted into the continuous gel domains with isolated macropores. The overall morphological variation with the reaction time was explained in terms of the phase separation and the structure freezing by the forced gelation, both of which were induced by the evaporation of methanol during the dipping operation.

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