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Browsing by Author "Emura, S."

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Absence of first order magnetic transition, a curious case of Mn3InC

Dias, E.T.; Das, A.; Hoser, A.; Emura, S.; Nigam, A.K.; Priolkar, K.R. (Journal of Applied Physics. 125; 2019; ArticleID_063904.)

The volume expanding magnetostructural transition in Mn3GaC and Mn3SnC has been identified to be due to distortion of Mn6Coctahedra. Despite a similar lattice volume as Mn3SnC and similar valence electron contribution to ...
Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6 ferromagnetic Heusler alloy

Priolkar, K.R.; Bhobe, P.A.; Lobo, D.N.; D'Souza, S.W.; Barman, S.R.; Chakrabarti, A.; Emura, S. (Physical Review B. 87(14); 2013; Article ID: 144412.)

Magnetism in Ni-Mn-Z (Z=Ga, In, Sn, Sb) Heusler alloys has so far been predominantly attributed to Rudermann-Kittel-Kasuya-Yoshida type interactions between Mn atoms. We investigate magnetic interactions in one such alloy, ...
Carbon-supported Pt-Fe alloy as a methanol-resistant oxygen-reduction catalyst for direct methanol fuel cells

Shukla, A.K.; Raman, R.K.; Choudhury, N.A.; Priolkar, K.R.; Sarode, P.R.; Emura, S.; Kumashiro, R. (Journal of Electroanalytical Chemistry. 563(2); 2004; 181-190.)

Crossover of methanol from the anode to the cathode through the polymer-electrolyte membrane in solid-polymer-electrolyte direct methanol fuel cells constitutes a significant loss in their performance. Pt/C and Pt-Fe/C ...
Ce(1-x)Rh(x)O(2-delta) solid solution formation in combustion-synthesized Rh/CeO2 catalyst studied by XRD, TEM, XPS, and EXAFS

Gayen, A.; Priolkar, K.R.; Sarode, P.R.; Jayaram, V.; Hegde, M.S.; Subbanna, G.N.; Emura, S. (Chemistry of Materials. 16(11); 2004; 2317-2328.)

Ionically dispersed Rh over CeO2 in Rh/CeO2 catalysts prepared by a single step solution combustion method is shown to improve the redox property and catalytic activity. The H-2/ Rh ratio obtained from hydrogen uptake ...
Controlling disorder in the ZnGa sub(2)O sub(4):Cr sup(3+) persistent phosphor by Mg sup(2+) substitution

Basavaraju, N.; Priolkar, K.R.; Bessiere, A.; Sharma, S.; Gourier, D.; Binet, L.; Viana, B.; Emura, S. (Physical Chemistry Chemical Physics. 19(2); 2017; 1369-1377.)

In this work we study the effect of increasing site occupancy disorder on the persistent luminescence of Cr sup(3+) doped zinc gallate spinel. This disorder was introduced by progressive substitution of Zn sup(2+) by Mg ...
Correlation between local structure distortions and martensitic transformation in Ni-Mn-In alloys

Lobo, D.N.; Priolkar, K.R.; Bhobe, P.A.; Krishnamurthy, D.; Emura, S. (Applied Physics Letters. 96(23); 2010; Article ID: 232508.)

The local structural distortions arising as a consequence of increasing Mn content in Ni(2)Mn(1+x)In(1-x) (x=0, 0.3, 0.4, 0.5, and 0.6) and its effect on martensitic transformation have been studied using extended x-ray ...
Effect of site occupancy disorder on martensitic properties of Mn2NiIn type alloys: X-ray absorption fine structure study

Lobo, D.N.; Priolkar, K.R.; Koide, A.; Emura, S. (Journal of Applied Physics. 121; 2017; ArticleID 053902.)

We have carried out ab-initio calculations of the local structure of Mn and Ni in the Mn sub(2)Ni sub(1.5)In sub(0.5) alloy with different site occupancies in order to understand the similarities in martensitic and magnetic ...
Effect of Ti(4+) substitution on structural, transport and magnetic properties of La(0.67)Sr(0.33)Mn(1-x)Ti(x)O(3)

Kulkarni, V.; Priolkar, K.R.; Sarode, P.R.; Rawat, R.; Banerjee, A.; Emura, S. (Journal of Physics-Condensed Matter. 20(7); 2008; Article ID: 075203)

La(0.67)Sr(0.33)Mn(1-x)Ti(x)O(3) (0 less than or equal to x less than or equal to 0.20) polycrystalline materials are prepared by employing lower annealing temperature compared to the temperatures reported for the materials ...
Ferromagnetic interactions and martensitic transformation in Fe doped NI-Mn-In shape memory alloys

Lobo, D.N.; Priolkar, K.R.; Emura, S.; Nigam, A.K. (Journal of Applied Physics. 116(18); 2014; Article ID 183903.)

The structure, magnetic and martensitic properties of Fe doped Ni-Mn-In magnetic shape memory alloys have been studied by differential scanning calorimetry, magnetization, resistivity, Xray diffraction (XRD) and EXAFS. ...
Formation of Ce(1-x)Pd(x)O(2-delta) solid solution in combustion-synthesized Pd/CeO2 catalyst: XRD, XPS, and EXAFS investigation

Priolkar, K.R.; Bera, P.; Sarode, P.R.; Hegde, M.S.; Emura, S.; Kumashiro, R.; Lalla, N.P. (Chemistry of Materials. 14(5); 2002; 2120-2128.)

Pd/CeO2 (1 at. percent) prepared by the solution-combustion method shows a higher catalytic activity for CO oxidation and NO reduction than Pd metal, PdO, and Pd dispersed over CeO2 by the conventional method. To understand ...
Importance of structural distortions in enhancement of transition temperature in FeSe(1-x)Te(x) superconductors

Ingle, K.E.; Priolkar, K.R.; Pal, A.; Zargar, R.A.; Awana, V.P.S.; Emura, S. (Superconductor Science and Technology. 28; 2015; Article ID 015015.)

Temperature (12 K less than or equal to T less than or equal to 300 K) dependent extended x-ray absorption fine structure (EXAFS) studies at the Fe K edge in FeSe(1-x)Te(x) (x = 0, 0.5 and 1.0) compounds have been carried ...
Influence of local structure on magnetic properties of layered cobaltites PrBaCo(2)O(5+delta), delta greater than 0.5

Ganorkar, S.; Priolkar, K.R.; Sarode, P.R.; Banerjee, A.; Rawat, R.; Emura, S. (Journal of Physics-Condensed Matter. 24(47); 2012; Article ID: 476003.)

The effect of local structure on the magnetic and transport properties of the layered perovskites has been investigated. The samples PrBaCo(2)O(5+delta), (delta = 0.80 and 0.67) crystallize in the same 112 type tetragonal ...
Ionic Dispersion of Pt over CeO(2) by Combustion Method: Structural Investigation by XRD, TEM, XPS and EXAFS

Bera, P.; Priolkar, K.R.; Gayen, A.; Sarode, P.R.; Hegde, M.S.; Emura, S.; Kumashiro, R.; Jayaram, V.; Subbanna, G.N. (Chemistry of Materials. 15(Apr); 2003; 2049-2060.)

The structure and chemical nature of Pt in combustion-synthesized Pt/CeO(2) catalysts have been investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ...
Local structural changes in paramagnetic and charge-ordered phases of Sm(0.2)Pr(0.3)Sr(0.5)MnO(3): an EXAFS study

Priolkar, K.R.; Kulkarni, V.; Sarode, P.R.; Emura, S. (Journal of Physics-Condensed Matter. 20(33); 2008; Article ID: 335227)

Sm(0.5-x)Pr(x)Sr(0.5)MnO(3) exhibits a variety of ground states as x is varied from 0 to 0.5. At an intermediate doping of x = 0.3 a charge-ordered CE-type antiferromagnetic insulating (AFI) ground state is seen. The ...
Local structural distortions and their role in superconductivity in SmFeAsO(1-x)F(x) superconductors

Ingle, K.; Priolkar, K.R.; Pal, A.; Awana, V.P.S.; Emura, S. (Superconductor Science and Technology. 27(7); 2014; Article No. 075010.)

EXAFS studies at the As K edge as a function of temperature were carried out in SmFeAsO(1-x)F(x) (x = 0 and 0.2) compounds to understand the role of local structural distortions in superconductivity observed in F-doped ...
Mechanism of magnetostructural transformation in multifunctional Mn sub(3)GaC

Dias, E.T.; Priolkar, K.R.; Ranjan, R.; Nigam, A.K.; Emura, S. (Journal of Applied Physics. 122(10); 2017; ArticleID_103906.)

Mn sub(3)GaC undergoes a ferromagnetic to antiferromagnetic, volume discontinuous cubic-cubic phase transition as a function of temperature, pressure, and magnetic field. Through a series of temperature dependent x-ray ...
Orbital ordering in Pr(0.5)Sr(0.5)MnO(3): PrK-edge XAFS study

Priolkar, K.R.; Kulkarni, V.D.; Sarode, P.R.; Kumashiro, R.; Emura, S. (Physica Scripta. T115; 2005; 442-444.)

Pr K-edge XAFS spectrum as a function of temperature in Pr(0.5)Sr(0.5)MnO(3) has been recorded on BL01B1 beam line at Spring-8, in order to study the effect of lattice distortions as the sample passes from a paramagnetic ...
Phase separation and effect of strain on magnetic properties of Mn sub(3)Ga sub(1-x)Sn sub(x)C

Dias, E.T.; Das, A.; Hoser, A.; Emura, S.; Nigam, A.K.; Priolkar, K.R. (Journal of Applied Physics. 124(15); 2018; ArticleID_153902.)

While the unit cell volume of compounds belonging to the Mn sub(3)Ga sub(1-x)Sn sub(x)C (0 less than or equal to x less than or equal to 1) series shows a conformity with Vegard’s law, their magnetic and magnetocaloric ...
Role of Ni-Mn hybridization in the magnetism of the martensitic state of Ni-Mn-In shape memory alloys

Priolkar, K.R.; Lobo, D.N.; Bhobe, P.A.; Emura, S.; Nigam, A.K. (EPL - Europhysics Letters. 94(3); 2011; Article ID: 38006.)

Extended X-ray Absorption Fine Structure (EXAFS) studies on Ni(50)Mn(25+x)In(25-x) have been carried out at the Ni and Mn K-edge as a function of temperature. Thermal evolution of nearest-neighbor Ni-Mn and Mn-Mn bond ...
Structural investigation of activated lattice Oxygen in Ce(1-x)Sn(x)O(2) and Ce(1-x-y)Sn(x)Pd(y)O(2-delta) by EXAFS and DFT calculation

Gupta, A.; Hegde, M.S.; Priolkar, K.R.; Waghmare, U.V.; Sarode, P.R.; Emura, S. (Chemistry of Materials. 21(24); 2009; 5836-5847.)

Substitution of Sn4+ ion in CeO(2) creates activated oxygen in Ce(0.8)Sn(0.2)O(2) leading to higher oxygen storage capacity compared to Ce(0.8)Zr(0.2)O(2). With Pd ion substitution in Ce(0.8)Sn(0.2)O(2), activation of ...

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