We herein report dielectric studies on Ca0.9Nd0.1Ti0.9Al0.1O3−δ single crystals grown by the optical floating zone technique in the temperature range from room temperature to 660 K.

Kalainathan S

Department of Physics

School of Advanced Sciences

Vellore Campus

Murugesan G

Nithya R

Hussain S.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

RSC Advances

Journal of Crystal Growth

Colossal dielectric behaviour of Sr2TiMnO6-δ single crystals

Hydroxyapatite doped with disparate ions is synthesized by Sol-gel technique. Hydroxyapatite is a widely bio-ceramic material for orthopedics and dental applications with weak mechanical strength. The hydroxyapatite doped with various ions which is often reported to enhance mechanical strength and to control bacterial infections. The aim of the work concentrates to improve the hardness of the material. Antibacterial activity enhances with the ions which combine with hydroxyapatite. These effects noticeably reveal that the hydroxyapatite can be well utilized with doping ions in order to develop their efficiency against the various bacterial strains. The effect of co-dopants investigated on their phase structure, bond formation, surface and optical properties are studied using X-ray diffraction technique, Fourier Transform Infra-red analysis, Atomic Force Microscopy and Ultraviolet–Visible spectroscopy. The crystalline size of all the synthesized materials varies from 39 to 49 nm. All the composites exhibit hexagonal crystal structure. The functional groups confirm the bonding formation of prepared samples. The surface roughness of hydroxyapatite were successfully analyzed and observed that the dopants increase the roughness. The dielectric property explains the space charge polarization is present at low frequency and negative temperature coefficient of resistance in the prepared samples. The addition of ions improves the mechanical properties of host materials, which well suitable for coating on implantation devices and for various medical applications. © 2019 Elsevier B.V.

Materials Chemistry and Physics

Study of structural, mechanical and dielectrical properties of ions doped apatite for antibacterial activity

The examinations of a bacterial zone, the antibacterial activity of synthesized materials are analyzed using different bacterial pathogens. The phases and crystalline size of the synthesized materials are calculated and the roughness of the materials shown in atomic force microscopy (AFM) can be used in medical applications. Zinc is doped with ions as co-dopants into hydroxyapatite using the sol–gel method. The synthesized materials are analyzed using X-ray diffraction, Fourier transform infrared spectroscopy, AFM, dielectric studies, ultra-violet–visible spectroscopy, mechanical strengths and antibacterial activity. This paper focuses on the mechanism of the dielectric properties analyzed for ion-doped hydroxyapatite which is used to enhance bone growth and various properties of materials which play a vital role in the medical field. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

Applied Physics A

Electrical, mechanical and surface analysis of ion-doped hydroxyapatite for antibacterial activity

(Ba1−xSrxTi0.6Zr0.3Mn0.1O3) x = 0.1 and 0.2 ferroelectric material were synthesized by solid state method. XRD studies confirmed the single phase formation, and the functional group confirmation was done using Fourier transform infrared spectroscopy. Dielectric relaxations were observed at different frequency ranges for different temperatures. Activation energy Ea is calculated using Arrhenius equation from impedance and modulus which corresponds to the existence of oxygen vacancies. © 2017, Springer Science+Business Media New York.

Journal of Materials Science: Materials in Electronics

Effect of Sr-doping on structure and electrical properties of (Ba1−xSrxTi0.6Zr0.3Mn0.1O3) x = 0.1 and 0.2 synthesized by solid state reaction

Dielectric relaxation in CoFe2−xYxO4 (x = 0.2, 0.4, 0.6) prepared by hydrothermal method

High temperature dielectric relaxation anomalies in Ca0.9Nd0.1Ti0.9Al0.1O3−δ single crystals

Single crystals of multifunctional Ca0.9Nd0.1Ti0.9Al0.1O3 have been grown in air and also in argon atmosphere using an optical floating zone technique.

CrystEngComm

Optical and spectroscopic studies of Ca0.9Nd0.1Ti0.9Al0.1O3 single crystals grown by an optical floating zone technique

Journal of Alloys and Compounds

Dielectric relaxation in YMnO3 single crystals

Oxygen-vacancy and charge hopping related dielectric relaxation and conduction process in orthorhombic Gd doped YFe0.6Mn0.4O3 multiferroics

Dielectric properties of ErFeO 3 ceramics over a broad temperature range

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