scholarly journals Structure–Property Relationships for Weak Ferromagnetic Perovskites

2021 ◽  
Vol 7 (8) ◽  
pp. 111
Author(s):  
Alexander Moskvin

Despite several decades of active experimental and theoretical studies of rare-earth orthoferrites, the mechanism of the formation of their specific magnetic, magnetoelastic, optical, and magneto-optical properties remains a subject of discussion. This paper provides an overview of simple theoretical model approaches to quantitatively describing the structure–property relationships—in particular, the interplay between FeO6 octahedral deformations/rotations and the main magnetic and optic characteristics, such as Néel temperature, overt and hidden canting of magnetic sublattices, magnetic and magnetoelastic anisotropy, and optic and photoelastic anisotropy.

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2221
Author(s):  
Pingping Jiang ◽  
Marie-Christine Record ◽  
Pascal Boulet

Two-dimensional MX2 (M = Mo, W; X = S, Se, Te) homo- and heterostructures have attracted extensive attention in electronics and optoelectronics due to their unique structures and properties. In this work, the layer-dependent electronic and optical properties have been studied by varying layer thickness and stacking order. Based on the quantum theory of atoms in molecules, topological analyses on interatomic interactions of layered MX2 and WX2/MoX2, including bond degree (BD), bond length (BL), and bond angle (BA), have been detailed to probe structure-property relationships. Results show that M-X and X-X bonds are strengthened and weakened in layered MX2 compared to the counterparts in bulks. X-X and M-Se/Te are weakened at compressive strain while strengthened at tensile strain and are more responsive to the former than the latter. Discordant BD variation of individual parts of WX2/MoX2 accounts for exclusively distributed electrons and holes, yielding type-II band offsets. X-X BL correlates positively to binding energy (Eb), while X-X BA correlates negatively to lattice mismatch (lm). The resulting interlayer distance limitation evidences constraint-free lattice of vdW structure. Finally, the connection between microscopic interatomic interaction and macroscopic electromagnetic behavior has been quantified firstly by a cubic equation relating to weighted BD summation and static dielectric constant.


2005 ◽  
Vol 902 ◽  
Author(s):  
Nikolay Pertsev

AbstractThe nonlinear thermodynamic theory of epitaxial ferroelectric films has predicted several important strain-induced phenomena, which have been already observed experimentally. This justifies further development of this theory aiming at the better understanding of the structure/property relationships in thin-film ferroelectrics. To that end, a number of new theoretical studies have been performed recently. First, the thermodynamic formalism has been extended to epitaxial films grown on dissimilar substrates inducing anisotropic strains and a shear deformation in the film plane. Second, the polarization states and dielectric properties were calculated for polydomain Pb(Zr1-xTix)O3 films deposited on cubic substrates. Third, the effect of depolarizing field on the physical properties of strained single-domain films sandwiched between continuous electrodes was described. The results of these studies will be discussed in this paper.


2016 ◽  
Vol 18 (28) ◽  
pp. 19123-19129 ◽  
Author(s):  
Guopeng Han ◽  
Qiong Liu ◽  
Ying Wang ◽  
Xin Su ◽  
Zhihua Yang ◽  
...  

LiPbPO4achieved a desired balance between UV transparency (232 nm) and high nonlinear optical (NLO) activity (about 3 × KDP).


2020 ◽  
Vol 49 (47) ◽  
pp. 17221-17229
Author(s):  
Peng Wang ◽  
Maierhaba Abudoureheman ◽  
Zhaohui Chen

PbPS3 with isolated ethane-like [P2S6]4− units exhibits good optical properties and shows promising application as a birefringent material.


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