Structural, Ferroelectric and Magnetic Properties of NiTiO3–CoTiO3 Solid Solutions Synthesized by Sol–Gel Method

Author:

Bac Luong Huu1ORCID,Phuong Nguyen Thanh1,Kim Thoa Do Thi1,Tuan Nguyen Hoang1,Dung Dang Duc1,Diem Ngoc Tran Vu2,Hung Pham Phi3

Affiliation:

1. School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet, Ha Noi, Vietnam

2. School of Materials Science and Engineering, Ha Noi University of Science and Technology, 1 Dai Co Viet, Ha Noi, Vietnam

3. Department of Chemical Engineering, POSTECH, Hyoja-Dong, San31, Pohang 790-784, Korea

Abstract

The Ni[Formula: see text]CoxTiO3[Formula: see text] solid solution powders were prepared by an aqueous sol–gel method. The structural, optical, magnetic and ferroelectric properties of NiTiO3 were investigated by X-ray diffraction, scanning electron microscope, UV–Vis absorption, vibration samples magnetometer and ferroelectric test system. The X-ray diffraction analysis revealed that prepared materials were in a single phase with rhombohedral structure with [Formula: see text] up to 1. The increasing Co content resulted in decreasing of tolerance factor and increasing of the lattice constant. The crystalline size increased with an increase of Co content. The optical bandgap value of solid solution increased from 2.23[Formula: see text]eV for NiTiO3 to 2.36[Formula: see text]eV for CoTiO3. The magnetic hysteresis loop results indicate that all samples showed paramagnetic state at room temperature. A correlation between magnetization values and composition of the materials was observed with magnetization values which increased with increasing of CoTiO3 content in solid solution. Ferroelectric polarization analysis showed that the polarization of the Ni[Formula: see text]CoxTiO3 solid solution depended on x value and reached the maximum with [Formula: see text].

Funder

Hanoi University of Science and Technology

Publisher

World Scientific Pub Co Pte Ltd

Subject

Electrical and Electronic Engineering,Computer Science Applications,Condensed Matter Physics,General Materials Science,Bioengineering,Biotechnology

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