Ferroic materials and anomalous strains

2005 ◽  
Vol 96 (4) ◽  
pp. 316-324 ◽  
Author(s):  
E. Hornbogen
Keyword(s):  
Ferroic Materials

Ferroic Materials

2009 ◽  
pp. 109-120
Author(s):  
Alexander K. Tagantsev ◽  
L. Eric Cross ◽  
Jan Fousek
Keyword(s):  
Ferroic Materials

scholarly journals Visualization of ferroaxial domains in an order-disorder type ferroaxial crystal

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
T. Hayashida ◽  
Y. Uemura ◽  
K. Kimura ◽  
S. Matsuoka ◽  
D. Morikawa ◽  
...  
Keyword(s):  
Optical Rotation ◽  
Axial Vector ◽  
Difference Image ◽  
Image Sensing ◽  
Transmission Electron ◽  
Combined Use ◽  
Scanning Transmission ◽  
Ferroic Materials ◽  
Convergent Beam ◽  
Disorder Type

Abstract Ferroaxial materials that exhibit spontaneous ordering of a rotational structural distortion with an axial vector symmetry have gained growing interest, motivated by recent extensive studies on ferroic materials. As in conventional ferroics (e.g., ferroelectrics and ferromagnetics), domain states will be present in the ferroaxial materials. However, the observation of ferroaxial domains is non-trivial due to the nature of the order parameter, which is invariant under both time-reversal and space-inversion operations. Here we propose that NiTiO3 is an order-disorder type ferroaxial material, and spatially resolve its ferroaxial domains by using linear electrogyration effect: optical rotation in proportion to an applied electric field. To detect small signals of electrogyration (order of 10−5 deg V−1), we adopt a recently developed difference image-sensing technique. Furthermore, the ferroaxial domains are confirmed on nano-scale spatial resolution with a combined use of scanning transmission electron microscopy and convergent-beam electron diffraction. Our success of the domain visualization will promote the study of ferroaxial materials as a new ferroic state of matter.

Ferroic materials: A primer

Resonance ◽  
2002 ◽  
Vol 7 (7) ◽  
pp. 15-24 ◽  
Author(s):  
V. K. Wadhawan
Keyword(s):  
Ferroic Materials

scholarly journals Mechanocaloric effects in shape memory alloys

2016 ◽  
Vol 374 (2074) ◽  
pp. 20150310 ◽  
Author(s):  
Lluís Mañosa ◽  
Antoni Planes
Keyword(s):  
Hydrostatic Pressure ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Lattice Distortion ◽  
Pure Shear ◽  
Uniaxial Stress ◽  
Martensitic Transition ◽  
Critical Survey ◽  
Magnetic Alloys ◽  
Ferroic Materials

Shape memory alloys (SMA) are a class of ferroic materials which undergo a structural (martensitic) transition where the associated ferroic property is a lattice distortion (strain). The sensitiveness of the transition to the conjugated external field (stress), together with the latent heat of the transition, gives rise to giant mechanocaloric effects. In non-magnetic SMA, the lattice distortion is mostly described by a pure shear and the martensitic transition in this family of alloys is strongly affected by uniaxial stress, whereas it is basically insensitive to hydrostatic pressure. As a result, non-magnetic alloys exhibit giant elastocaloric effects but negligible barocaloric effects. By contrast, in a number of magnetic SMA, the lattice distortion at the martensitic transition involves a volume change in addition to the shear strain. Those alloys are affected by both uniaxial stress and hydrostatic pressure and they exhibit giant elastocaloric and barocaloric effects. The paper aims at providing a critical survey of available experimental data on elastocaloric and barocaloric effects in magnetic and non-magnetic SMA. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

First-principles investigations of caloric effects in ferroic materials

2012 ◽  
Author(s):  
Peter Entel ◽  
Sanjubala Sahoo ◽  
Mario Siewert ◽  
Markus E. Gruner ◽  
Heike C. Herper ◽  
...  
Keyword(s):  
First Principles ◽  
Ferroic Materials
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