Structural, optical and conductivity properties in tetragonal BaTi1- x Co x O3 (0≤ x ≤0.1)

L T H Phong; N T Dang; N V Dang; Van-Quynh Nguyen; D H Manh; P H Nam; L H Nguyen; P T Phong

doi:10.1039/d2ra01411d

Structural, optical and conductivity properties in tetragonal BaTi_{1- x} Co _x O₃ (0≤ x ≤0.1)

RSC Adv. 2022 May 30;12(25):16119-16130. doi: 10.1039/d2ra01411d. eCollection 2022 May 23.

Authors

L T H Phong¹, N T Dang^{2

3}, N V Dang^{4

5}, Van-Quynh Nguyen⁶, D H Manh¹, P H Nam^{1

7}, L H Nguyen^{8

9}, P T Phong^{8

9}

Affiliations

¹ Institute of Materials Science, Vietnam Academy of Science and Technology Hanoi Vietnam.
² Institute of Research and Development, Duy Tan University 550000 Da Nang Vietnam.
³ Faculty of Natural Sciences, Duy Tan University 550000 Da Nang Vietnam.
⁴ Department of Physics and Technology, Thai Nguyen University of Science Thai Nguyen City Vietnam.
⁵ Hong Duc University Thanh Hoa Vietnam.
⁶ University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology Ha Noi Vietnam.
⁷ Graduate University of Science and Technology, Vietnam Academy of Science and Technology Hanoi Vietnam.
⁸ Laboratory of Magnetism and Magnetic Materials, Science and Technology Advanced Institute, Van Lang University Ho Chi Minh City Vietnam phamthanhphong@vlu.edu.vn.
⁹ Faculty of Technology, Van Lang University Ho Chi Minh City Vietnam.

Abstract

This work investigates the structure, optical and electrical conductivity properties of BaTi_1-x Co _x O₃ (0≤ x ≤0.1) ceramics prepared by the hydrothermal method. The X-ray diffraction and Raman scattering analysis demonstrates that the prepared samples have a single-phase tetragonal structure with P4mm symmetry. The UV-vis diffuse reflectance spectrum confirms the influence of Co concentration on the direct optical band gap of BaTi_1-x Co _x O₃ ceramics. The optical band gap shifts from 3.14 eV to 3.44 eV as the Co concentration increases from 0 to 0.1. The dielectric constant increases with the depletion of frequency according to the Maxwell-Wagner and Koops model. The AC conductivity versus frequency curve indicates that the conduction mechanism is determined by using the correlated barrier hopping (CBH) model. The Cole-Cole plot of the complex impedance was investigated for the prepared samples. The compounds showed dielectric relaxation of the non-Debye type.