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T.S Sampathkumar

Bio: T.S Sampathkumar is an academic researcher from University of Madras. The author has an hindex of 1, co-authored 1 publications receiving 7 citations.

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TL;DR: The effect of BaBiO 3 addition on the structural, thermal, and superconducting properties of YBa 2 Cu 3 O 7−δ (123) superconductor have been studied as mentioned in this paper.

7 citations


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TL;DR: A brief overview of the main types and principles of solid-state proton conductors with perovskite structure is given in this paper, in terms of the defect chemistry, proton transport and chemical stability.
Abstract: A brief overview is given of the main types and principles of solid-state proton conductors with perovskite structure. Their properties are summarized in terms of the defect chemistry, proton transport and chemical stability. A good understanding of these subjects allows the manufacturing of compounds with the desired electrical properties, for application in renewable and sustainable energy devices. A few trends and highlights of the scientific advances are given for some classes of protonic conductors. Recent results and future prospect about these compounds are also evaluated. The high proton conductivity of barium cerate and zirconate based electrolytes lately reported in the literature has taken these compounds to a highlight position among the most studied conductor ceramic materials.

139 citations

Journal ArticleDOI
TL;DR: In this article, the structural, electronic and thermodynamic properties of XZrS3 (X = Ba,Sr,Ca) compounds with orthorhombic Pbnm and cubic Pnma-3m phases have been investigated and reported.
Abstract: The structural, electronic and thermodynamic properties of XZrS3 (X = Ba,Sr,Ca) compounds with orthorhombic Pbnm and cubic Pm-3m phases have been investigated and reported. The calculations have been performed using various density functionals within the generalized gradient approximation. The obtained lattice parameters for the Pnma phase reveal very good agreement with experiment. The computed electronic band structures show that in the cubic phase the material of interest is an indirect band-gap (R–Г) semiconductor, whereas it is a direct band gap (Г–Г) in the orthorhombic phase. The semiconducting XZrS3 (X = Ba,Sr,Ca) compounds are found to satisfy the stability criteria against volume change. Based on the quasi-harmonic Debye model, the thermodynamic properties of the material in question have been predicted taking into account the lattice vibrations. The variation of the lattice constant, bulk modulus, heat capacity, Debye temperature and thermal expansion coefficient as a function of pressure in the range 0–30 GPa and temperatures of 0–1500 K has been computed. Our findings show that external effects such as temperature and pressure are highly effective in tuning some of the macroscopic properties of the compounds under study.

16 citations

Journal ArticleDOI
TL;DR: In this article, the edge and surface antiferromagnetic properties of the ABO3 perovskite-type nanoparticle and their components (A, B and O) were investigated through the Effective Field Theory developed by Kaneyos.
Abstract: The edge and surface antiferromagnetic properties of the ABO3 perovskite-type nanoparticle and their components (A, B and O) are investigated through the Effective Field Theory developed by Kaneyos...

14 citations

Journal ArticleDOI
TL;DR: In this paper, structural and electrical properties of ferroelectric-superconductor composites with variable volume fractions were studied, and the percolation threshold for the insulating-conducting transition at room temperature was evaluated.
Abstract: We studied the structural and electrical properties of ferroelectric-superconductor composites with variable volume fractions. Specifically, the insulating-(super)conducting transition is examined. Our results show that compatibility between Pb 2 (ScTa)O 6 ferroelectric and YBa 2 Cu 3 O 7−δ superconducting materials is strong, as superconducting composites with 56% of ferroelectric material in volume have a zero resistance critical temperature at 87 K. From resistivity measurements, the critical fraction of YBCO, for which the insulating-superconducting transition occurs at low temperature, and the percolation threshold for the insulating-conducting transition at room temperature are evaluated. For this second transition, we estimate that the transport critical exponent, t = 2.0 ± 0.3, is in excellent agreement with the percolation theory in three dimensions (3D). This gives strong evidence that transport in the composites takes place in 3D and indirectly confirms that the interfacial reactivity between the two materials is very weak, as shown by the X-ray diffraction patterns.

6 citations

Journal ArticleDOI
TL;DR: In this article, the superconducting properties of the ABO3-type Perovskites were investigated by effective field theory, and it was found that the core (B) atom of the core exhibits type II superconducted hysteresis behaviors when it interacts antiferromagnetic with the shell (A and O) atoms.
Abstract: Superconducting magnetic hysteresis properties of the ABO3-type Perovskites are investigated by the effective field theory. It is found that the core (B) atom of the ABO3 exhibits type II superconducting hysteresis behaviors when it interacts antiferromagnetically with the shell (A and O) atoms. Therefore, the magnetic hysteresis curve of B atoms in the ABO3 has binary coercive field points (lower coercivity; Hc1, and upper coercivity; Hc2). B atoms have a Meissner state at HHc2. Our results indicate that the superconducting properties of the ABO3-type Perovskites result from the antiferromagnetic interaction between the shell (O) and core (B) atoms.,>

3 citations