Raj Sankar C

Dr. RAJ SANKAR C

Qualification: 

M.Sc, Ph.D, NET with JRF

Designation: 

Assistant Professor

Department: 

Chemistry

Courses presently handled: 

B.Sc., M.Sc.

Area of Interests: 

Inorganic Chemistry, Physical Chemistry

Publications: 

  1. J. P. Palakkal, C. Raj Sankar*, P. N. Lekshmi, M. Valant, M. V. Mihelj and M. R. Varma*, Large positive and negative magnetodielectric coupling in LaFe0.5Mn0.5O3, Accepted, Journal of Magnetism and Magnetic Materials (2018)
  2. J. P. Palakkal, C. Raj Sankar, A. Kaipamangalath, M. R. Varma, Structural, magnetic, and magnetotransport properties of LaFe0.5Ni0.5O3, Accepted, Ceramic International (2018) [https://doi.org/10.1016/j.ceramint.2018.09.005]
  3. J. P. Palakkal, M. Rijila, A. P. Paulose, C. Raj Sankar*, Collective dipolar relaxation in a molecular nanomagnet, Mn12-acetate, Journal of Magnetism and Magnetic Materials 466, 289-294 (2018) [https://doi.org/10.1016/j.jmmm.2018.07.026]
  4. V. S. Aswathy, and C. Raj Sankar*, Low temperature thermoelectric and magnetoresistive properties of Tl2Cu3FeQ4 (Q= S, Se, Te), Inorganic Chemistry Frontiers
    5, 1553-1562  (2018)[https://doi.org/10.1039/C8QI00058A]
  5. J. P. Palakkal, Chinna Obula Reddy, Ajeesh P Paulose, C. Raj Sankar*, Surface spin tunneling and heat dissipation in magnetic nanoparticles, Accepted, Materials Research Express, (2018) [https://doi.org/10.1088/2053-1591/aab0f6]
  6. J. P. Palakkal, C. Raj Sankar, A. P. Paulose, M. Valant, A. Badasyan, and M. R. Varma, Unusual magnetodielectric effects in La2CuMnOinduced by dynamic crossover in dielectric relaxation at TC, Accepted, Materials Research Bulletin, (2018) [https://doi.org/10.1016/j.materresbull.2017.12.027]
  7. J. P. Palakkal, C. Raj Sankar*, A. P. Paulose, M. R. Varma, Hopping conduction and spin glass behavior of La2FeMnO6, Accepted, Journal of Alloys and Compounds (2018) [https://doi.org/10.1016/j.jallcom.2018.01.210]
  8. V. S. Aswathy, C. Raj Sankar*, M. R. Varma, A. Assoud, M. Bieringer, and H. Kleinke, Thermoelectric properties and thermal stability of layered chalcogenides, TlScQ2, Q= Se, Te,, Dalton Transactions 46, 17053 (2017) [http://dx.doi.org/10.1039/C7DT03446F]
  9. J. P. Palakkal, C. Raj Sankar, and M. R. Varma, Multiple magnetic transitions, Griffiths-like phase, and magnetoresistance in La2CrMnO6, Journal of Applied Physics 122, 073907 (2017).  [https://doi.org/10.1063/1.4999031]
  10. Y. Shi, A. Assoud, C. Raj Sankar, H. Kleinke, Tl2Ag12Se7: a new pnp conduction switching material with extraordinarily low thermal conductivity, Chemistry of Materials, 29, 9565-9571 (2017) [http://dx.doi.org/10.1021/acs.chemmater.7b04015]
  11. A. Assoud, Q. Guo, C. Raj Sankar, H. Kleinke, Crystal structure, electronic structure and physical properties of the new quaternary chalcogenides Tl2NdAg3Se4 and Tl2NdAg3Te4, Inorganic Chemistry Frontiers, 4, 315 - 323 (2017). [http://dx.doi.org/10.1039/c6qi00436a]
  12. A. Assoud, C. Raj Sankar, H. Kleinke, Synthesis, crystal structure, electronic structure and electrical conductivity of La3GeSb0.31Se7 and La3SnFe0.61Se7, Solid State Sci. 38, 124 - 128 (2014). [http://dx.doi.org/10.1016/j.solidstatesciences.2014.10.009]
  13. C. Raj Sankar, A. Assoud and H. Kleinke, New layered-type quaternary chalcogenides, Tl2PbMQ4 (M = Zr, Hf, Q = S, Se): Structure, electronic structure and electrical transport properties, Inorg. Chem. 52, 13869-13874 (2013).[ http://dx.doi.org/10.1021/ic4025316
  14. S. Bangarigadu-Sanasya, C. Raj Sankar, P. A. Dube, J. E. Greedan, H. Kleinke, Magnetic properties of Tl9LnTe6, Ln = Ce, Pr, Tb and Sm, J Alloys Compd. . 589, 389 (2014).  [http://dx.doi.org/10.1016/j.jallcom.2013.11.229]
  15. C. Raj Sankar, A. Becker, A. Assoud and H. Kleinke, New quaternary chalcogenides, Tl18Pb2M7Q25 (M = Ti, Zr, and Hf, Q = S and Se): Crystal structure, electronic structure, and electrical transport properties, Inorg. Chem. 52, 1895 (2013) [http://dx.doi.org/10.1021/ic3020699]
  16. S. Bangarigadu-Sanasy, C. Raj Sankar, P. Schlender and H. Kleinke, Thermoelectric properties of Tl10–xLnxTe6, with Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Er, and 0.25 ≤ x ≤ 1.32 ( J. Alloys Compd.  594, 126 (2013) [http://dx.doi.org/10.1016/j.jallcom.2012.09.023]
  17. C. Raj Sankar, B. A. Kuropatwa, A. Assoud and H. Kleinke, Structures and properties of the ternary thallium chalcogenides Tl2MQ3 (M = Zr, Hf; Q = S, Se), (Dalton Transactions,41, 9646, 2012)
  18. O. Mayasree, C. Raj Sankar, K. Kleinke and H. Kleinke, Cu clusters and chalcogen-chalcogen Bonds in various copper polychalcogenides, Coordination Chemistry Reviews, 256, 1377 (2012) [http://dx.doi.org/10.1016/j.ccr.2012.03.016]
  19. M. Guch, C. Raj Sankar, J. Salvador, G. Meisner, H. Kleinke, Effect of simultaneous doping of Indium and Iodine on thermoelectric properties of PbTe, Journal of Applied Physics, 111, 063706 (2012) [http://dx.doi.org/10.1063/1.3694742]
  20. C. Raj Sankar, S. Bangarigadu-Sanasy, A. Assoud and H. Kleinke, Thermoelectric properties of TlGdSe2, TlGdTe2 and Tl9GdTe6, Journal of Electronic Materials, 41, 1662 (2012) [http://dx.doi.org/10.1007/s11664-011-1846-z]
  21. C. Raj Sankar, M. Guch, A. Assoud and H. Kleinke, Structural, thermal, and physical properties of the thallium zirconium telluride Tl2ZrTe3, Chemistry of Materials, 23, 3886 (2011) [http://dx.doi.org/10.1021/cm200994t]
  22. O. Mayasree, C. Raj Sankar, Y. Cui, A. Assoud, H. Kleinke, Synthesis, structure and thermoelectric properties of Barium Copper Polychalcogenides with chalcogen-centered Cu clusters and Te22– dumbbells, European  Journal of Inorganic Chemistry, 2011, 4037 (2011) [http://dx.doi.org/10.1002/ejic.201100284]
  23. C. Raj Sankar, S. Bangarigadu-Sanasy, and H. Kleinke, Thermoelectric properties of new thallium tellurides, Mateials Research Society Symposium 1309, 67 - 76 (2011) [http://dx.doi.org/10.1557/opl.2011.99].
  24. M. Guch, C. Raj Sankar, J. Salvador, G. Meisner, and H. Kleinke, Thermoelectric properties of In-doped PbTe, Science of Advanced Materials, 3, 615 - 620 (2011) [http://dx.doi.org/10.1166/sam.2011.1191]
  25. O. Mayasree, C. Raj Sankar, A. Assoud and H. Kleinke, New barium copper chalcogenides synthesized by using two different chalcogen atoms: Ba2Cu6–xSTe4 and Ba2Cu6–xSeyTe5–y, Inorganic Chemistry 50, 4580 (2011) [http://dx.doi.org/10.1021/ic2002628]
  26. S. Bangarigadu-Sanasy, C. Raj Sankar, A. Assoud and H. Kleinke, Crystal Structures and Thermoelectric Properties of the series Tl10–xLaxTe6 with 0.5 ≤ x ≤ 1.15 Dalton Transactions 40, 862 (2011) [http://dx.doi.org/10.1039/C0DT01151G]
  27. C. Raj Sankar, S. Bangarigadu-Sanasy, A. Assoud and H. Kleinke, Structure and Properties of Thallium-group4-chalcogenides, Tl4MQ4 (M =Zr, Hf and Q =S, Se, Te), Inorganic Chemistry 50, 245 (2011) [http://dx.doi.org/10.1021/ic101925a]
  28. M. Guch, C. Raj Sankar, A. Assoud and H. Kleinke, Crystal structure and physical properties of the new antimonide Hf3Cu2Ge3.58Sb1.42, Chemistry of Materials 22, 6433 (2010) [http://dx.doi.org/10.1021/cm102632a]
  29. C. Raj Sankar, S. Bangarigadu-Sanasy, A. Assoud and H. Kleinke, Syntheses, Crystal Structures and Thermoelectric Properties of two new Thallium Tellurides: Tl4ZrTe4 and Tl4HfTe4, Journal of Materials Chemistry, 20, 7485 (2010) [http://dx.doi.org/10.1039/c0jm01363c]
  30. C. Raj Sankar, S. Vijayanand, and P. A. Joy, Ferromagnetic to spin glass cross over (La,Tb)2/3Ca1/3MnO3, Solid State Sciences, 11, 714 (2009) [http://dx.doi.org/10.1016/j.solidstatesciences.2008.10.002]
  31. C Raj Sankar, S Vijayanand, Seema Verma and P A Joy, Direct comparison of the aging and memory effects of magnetic nanoclusters and nanoparticles, Solid State Communications 141, 307 (2007) [http://dx.doi.org/10.1016/j.ssc.2006.11.015]
  32. C. Raj Sankar and P. A. Joy: Superspin glass behavior of a non-stoichiometric lanthanum manganite, LaMnO3.13, Physical Review B: 72, 132407 (2005) [http://dx.doi.org/10.1103/PhysRevB.72.132407]
  33. Tanushree Bala, C. Raj Sankar, Marina Baidakova, Vladimir Osipov, Toshiaki Enoki, P. A. Joy, B. L. V. Prasad, and Murali Sastry: Cobalt and Magnesium ferrite nanoparticles: Preparation using liquid foams as templates and their magnetic characteristics, Langmuir: 21, 10638 (2005) [http://dx.doi.org/10.1021/la051595k]
  34. C. Raj Sankar and P. A. Joy: Magnetic properties of the self-doped lanthanum manganites La1-xMnO3, Physical Review B: 72, 024405 (2005) [http://dx.doi.org/10.1103/PhysRevB.72.024405]
  35. C. Raj Sankar and P. A. Joy, Studies on the evolution of a low-temperature anomaly in the AC susceptibility of ferromagnetic La1-xMnO3 (0 < x ≤ 0.125) series,  Journal of Magnetism and Magnetic Materials 277, 209 (2004) [http://dx.doi.org/10.1016/j.jmmm.2003.11.001]
  36. P. A. Joy and C. Raj Sankar and S. K. Date:  The limiting value of x in the ferromagnetic compositions La1-xMnO3, Journal of Physics: Condensed Matter 14, L663 (2002) [http://dx.doi.org/10.1088/0953-8984/14/39/104]
  37.  P. A. Joy and C. Raj Sankar and S. K. Date: The origin of ferromagnetism in LaMnO3+d , Journal of Physics: Condensed Matter 14, 4985 (2002) [http://dx.doi.org/10.1088/0953-8984/14/19/320].
  38. C. Raj Sankar and P.A. Joy, Self-Doped lanthanum manganite: A potential magnetoresistive material for future applications, Magnetics Society of India (MSI) Bulletin 26, 19 (2003).
  39. C. Raj Sankar, P. A. Joy, and S. K. Date, Comparison of structural and magnetic properties of LaMnO3+dand La1-xMnO3, Inorganic Materials: Recent Advances, Ed: D. Bahadur, S. Vitta, and O. Prakash, Narosa Publishing House, New Delhi (2004).
  40. J. P. Palakkal and C. Raj Sankar*, Memory and aging effects of molecular nanomagnet Mn12 benzoate’ AIP Conference proceedings, accepted for publication.
  41. V. S. Aswathy, M. R. Varma, and C. Raj Sankar*, Electronic structure and low temperature magnetoresistance of polycrystalline TlMQ2 (M = Sc, Bi, Q = Se, Te) AIP Conference proceedings, accepted for publication.

 

Memberships: 

Member of international thermoelectric society

Reviewer of Journal of Alloys and Compounds (Elsevier), Physical Chemistry and Chemical Physics (RSC), Inorganic Chemistry (ACS)

Email: 

rajsankar@keralavarma.ac.in

Address: 

Dept of Chemistry, SKV College, Thrissur