Multiferroic and phonon properties of pure and ion doped CoCr2O4 - Bulk and nanoparticles

被引：8

作者：

Apostolova, Iliana N. ^{[1
]}

Apostolov, Angel T. ^{[2
]}

Wesselinowa, Julia M. ^{[3
]}

机构：

[1] Univ Forestry, 10 Kl Ohridsky Blvd, Sofia 1756, Bulgaria

[2] Univ Architecture Civil Engn & Geodesy, 1 Hristo Smirnenski Blvd, Sofia 1046, Bulgaria

[3] Univ Sofia, 5 J Bouchier Blvd, Sofia 1164, Bulgaria

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 852卷

关键词：

CoCr2O4; nanoparticles; Magnetization; Polarization; Specific heat; Phonon energy; Microscopic model; CATION DISTRIBUTION; MAGNETIC-PROPERTIES; CLASSICAL-THEORY; CRYSTAL SIZE; FERROELECTRICITY; REDUCTION; TEMPERATURE; EXAFS; CO;

D O I：

10.1016/j.jallcom.2020.156885

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using a microscopic model we have studied different properties of pure and ion doped CoCr2O4 - bulk and NPs. The magnetization M-s and the Curie temperature T-c decrease with decreasing particle size. By Fe doping M-s and T-c increase with enhancing Fe concentration x whereas by Mg doping we obtain the opposite effect. In the first case there is a compressive strain, in the second one - a tensile strain due to the different radii of the doping ions compared to the host ones. This leads to different exchange interaction constants in the doped states. The polarization P-s increases with increasing Fe doping concentration x. Two anomalies are observed in the specific heat C-p, at T-c = 98 K, and T-s = 25 K, which are not so sharp applying h. The temperature, magnetic field, size and doping dependence of the phonon energy omega(0) = 685 cm(-1) and damping are also investigated. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：6

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