Dr. R. Ratheesh Fax
:+91-487-721 347 |
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Born on 31st May, 1968; Age: 31; Indian Citizen Presently working as Alexander von Humboldt Postdoctoral fellow at Institute of Chemistry, University of Osnabrück, Germany on ‘Dielectric Ceramic Materials’
PRESENT ADDRESS:
Dr.R.Ratheesh Humboldt Fellow Anorganische Chemie Institüte fur Chemie Universität Osnabrüc Barbarastraße 7 D-49069 Osnabrück Germany PH +49-541-969-2782 FAX: +49-541-969-2370 E-mail: ratheesh@uos.de
Ph.D. (Doctor of Philosophy), Physics (Materials Science): 1995, Kerala University PGDCA(Post Graduate Diploma in Computer Applications); First Class:1992 Technical Education, Government of Kerala M.Sc.(Master of Science), Physics; First Class: 1990 Barkathullah Viswa Vidhyalaya B.Sc.(Bachelor of Science), Physics; First Class: 1988 Kerala University
PROFESSIONAL & RESEARCH EXPERIENCES (1991-1997)
One of the driving philosophies behind my study and work in physics is that the understanding and application of physical interactions and processes leads to new, elegant and economical use of technology in society. The advance of technology brings about an improvement in the efficiency of labour and resources, the quality of life and creates new possibilities wherever it is applied: sometimes unexpectedly. I have a wide ranging interest in physics and science in general. Area of Research Interests: Microwave studies of ceramics dielectric resonator materials; substrate materials, Phase transition analysis of inorganic single crystals using temperature dependent Laser Raman spectroscopy, Thin films etc. Carried out research towards Ph.D. in the field of Laser Raman Spectroscopy from Department of Physics, University of Kerala, Kariavattom, Trivandrum, India under the guidance of Prof. V. Unnikrishnan Nayar. Worked as Research Associate at Regional Research Laboratory (CSIR), Trivandrum, India in the area of microwave ceramic dielectric resonators.
Current area of reaserch include Preparation, Characterisation and Lattice vibrational studies using Infrared and Raman spectroscopy of dielectric ceramics for microwave applications; Whispering Gallery Mode microwave characterisation of Dielectric Resonators, Growth and characterisation of non-linear and electrooptic materials etc. Studied the microwave resonator properties such as dielectric constant, quality factor and temperature-coefficient in relation with various structural aspects of ceramics. Microwave dielectric properties of ceramic compacts are studied using an Hp network analyser. Worked as a postdoctoral fellow at Department of Physics, University of Westrn Australia under Dr. Micheal E. Tobar, Deputy Director, Low Noise Oscillator Group, AIGRC on the Whispering Gallery Mode microwave measurements of Ceramic Dielectric Resonators.
Collaborative Projects/Programmes with Foreign Universities
Japan
Prof. M. Ichikawa
Department of Physics Hokkaido University Sapporo , Japan
No of research papers with this group :3
Austria
Dr.G.Giester
Institute fur Mineralogie und Kristallographie Universitat Wien ,
Austria No of research papers with this group :2
United States of America
Dr.R.E.Morris
Department of Chemistry
University of California Santa Barbara, U.S.A.
No of research papers with this group : 2
Hungary
Prof. Gabor Keretztury
Department of Chemistry Hungarian Academy of Sciences Budapest,
Hungary No. of research papers with this group: 2
Australia
Dr. Micheal E. Tobar
Department of Physics
University of Western Australia, Nedlands 6907 Perth Australia
No. of research papers with this group : 2
Patent
A New Ceramic Material for Microwave Integrated Circuit Applications H.Sreemoolanadhan, R. Ratheesh, M.T.Sebastian and P.Mohanan; File No. 40. NF. 1996
Referred Journal Articles
1.Whispering Gallery Mode microwave characterisation of Ba(Mg1/3 Ta2/3) O3 Ceramics R.Ratheesh, M.T.Sebastian, M.E.Tobar, J. Hartnett and D.G. Blair, J. Phys. D, 32, 2821-26 (1999).
2.Preparation, Characterisation and Properties of Ba(B'1/2, Nb1/2)O3 [B'= La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er, Y &In] Ceramic Microwave Dielectric Resonators H.Sreemoolanadhan, R.Ratheesh, M.T.Sebastian and P.Mohanan, J. Electroceramics, 1999 (In Press)
3.Preparation, Characterisation and Microwave Dielectric Properties of RETiNbO6 [ RE= Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Y, Yb] ceramics M.T.Sebastain, Sma Solomon, R.Ratheesh, Jacob George and P. Mohanan, J. Ame. Ceram. Soc. 1999 (In Press)
4.New High Permittivity and low loss ceramic in the BaO-TiO2-Nb2O5 composition R.Ratheesh, H. Sreemoolanadhan, M.T.Sebastian and P. Mohanan , J. Mater. Sci.:Materials in Elect., 9(4) 291 (1998)
5. Preparation, Characterisation and Dielectric Properties of Ceramics in the BaO-Nd2O3-TiO2 Systems R.Ratheesh, H. Sreemoolanadhan, M.T. Sebastian and P. Mohanan, Ferroelectrics, 211, PP1-8 (1997)
6. The synthesis and characterisation of Hf-substituted (Zr0.8, Sn0.2)TiO4 H. Sreemoolanadhan, R.Ratheesh, M. T. Sebastian and P. Mohanan, J. Phys. D: Appl. Phys., 30, 1809 (1997).
7. Vibrational analysis of Ba5-xSrxNb4O15 microwave dielectric ceramic resonators, R. Ratheesh, H. Sreemoolanadhan, and M. T. Sebastian, J. Solid State Chem. 131, 2(1997).
8. Barium Terbium Niobate: A New Ceramic microwave dielectric resonator H. Sreemoolanadhan, R.Ratheesh, M.T.Sebastian and P. Mohanan, Mater. Lett. 33, 161-165, 1997
9. Samarium Titanium Niobate(SmTiNbO6): A New Microwave Dielectric Ceramic, M. T. Sebastian, R. Ratheesh, H. Sreemoolanadhan, Sam Solomon and P.Mohanan, Mater. Res. Bull., 32, 1279(1997).
10. Vibratioanl Spectra of three Aluminium Selenites Al2(SeO3)3.6H2O, Al2(SeO3)3.3H2O and AlH(SeO3)2.3H2O R.Ratheesh, G. Suresh, V.U. Nayar and R.E. Morris, Spectrochim Acta 53 A, 1975-1979(1997)
11. Vibrational Analysis of Cu(HSeO3)2.H2O Single Crystal at Room and Liquid Nitrogen Temperatures R.Ratheesh, G. Suresh, M.J.Bushiri and V.U.Nayaer, Ind. J. Cryog., 20(1), 17(1995)
12. Vibrational analysis of Cu(HSeO3)2.H2O single crystal, R.Ratheesh, G. Suresh, M.J.Bushiri and V. U. Nayar, Spectrochim Acta. A52, 1313(1996)
13. Infrared and Polarized Raman spectra of RbAl(SO4)2.12H2O Single crystals, G.Suresh, R.Ratheesh, T.Pradeep,R.S.Jayasree, V.U.Nayar and G.Keresztury, J. Solid State Chem., 122, 333-337 (1996).
14. Vibrational spectra of NH4Sm(SO4)2.4H2O and (NH4)2Ln(SO4)2.4H2O[Ln=Yb,Tm), G.Suresh, R.Ratheesh, K.Manoj Kumar and V.U.Nayar, J. Solid State Chem.,121, 408-414 (1996) .
15. Raman spectroscopic investigations on the phase transitions in Rb3H(SeO4)2 and Rb3D(SeO4)2 single crystals G.Suresh, R.Ratheesh, V.U.Nayar and M.Ichikawa,Spectrochimica Acta., A52, 465 (1995)
16. Spectroscopic investigation of a single crystal K3H(SeO4)2 , G.Suresh, R.Ratheesh, V.U.Nayar and M.Ichikawa,Ferroelectrics, 173, 257 (1995).
17. IR and Raman spectra of LaH(SeO3)2 and FeH(SeO3)2; R.Ratheesh, G.Suresh, V.U.Nayar, G. Giester and R.E .Morris, Indian J. Phys., 69B(4), 307-313, 1995.
18. Infrared and Polarized Raman spectra of Cu(HSeO3)2.H2O single Crystals R.Ratheesh, G.Suresh, M.J.Bushiri and V.U.Nayar, Spectrochimica Acta , 51A , 1509,1995
19. Infrared and Polarized Raman spectra of M6[TeMo6O24].7H2O [M=K and NH4] and (NH4)6[TeMo6O24].Te(OH)6.7H2O single crystals, R.Ratheesh, G.Suresh and V.U.Nayar , J. Solid State Chemistry, 118, 341, 1995.
20 IR and Polarized Raman spectra of a single crystal; Rb3H(SeO4)2 in the ferroelastic phase, G.Suresh, R.Ratheesh,V.U.Nayar, M.Ichikawa and G.Keresztury, Spectrochimica Acta, 51A, 3, 1995.
21. Vibrational Analysis of NaM2(OH)(H2O)(MoO4)2[M= Ni, Zn] R.Ratheesh, G.Suresh and V.U.Nayar , Pramana, 44, 5, 1995. 22. Microwave Dielectric properties of Ba2La4Ti5O18 and Ba2Nd4Ti5O18 Ceramics; R.Ratheesh, H.Sreemoolanadhan, M.T.Sebastian and P.Mohanan, (communicated to Ferroelectrics)
Symposia/Seminars
1. Microwave characterisation of Ba(Mg1/3, Ta2/3)O3 dielectric ceramics using the Whispering Gallery Mode method R. Ratheesh, M.T. Sebastian, M.E. Tobar, J. Harnett and D.G. Blair, 12th Frequency and Time Forum, Warzawa, Poland (1998)
2. Whispering Gallery mode microwave characterisation of Ba2Nd4Ti5O18 dielectric resonators, R.Ratheesh, H.Sreemoolanadhan, M.T.Sebastian, M.E.Tobar, J.G.Hartnett, D.G.Blair, Advances in Microwave and Lightwaves, Ed. E.K. Sharma, Allied Publishers, New Delhi, pp.8-11, 1998
3. Preparation, structure and Properties of Ba(RE1/2,Nb1/2)O3 Microwave resonators H. Sreemoolanadhan, R.Ratheesh, Sam Solamon, M.T.Sebastian and P. Mohanan, XXVIII National Seminar on Crystallography, M.G. University, Kottayam, 1997.
4. BaCe2Ti5O15: A new dielectric resonator H. Sreemoolanadhan, R. Ratheesh, M.T. Sebastian, K.A. Jose and P. Mohanan, Proceedings of the National Symposium on Antennas and Propagation (APSYM) 1996, Cochin.
5. Effect of Hf substitution on the microwave dielectric properties of (Zr0.8Sn0.2)TiO4 H. Sreemoolanadhan, R. Ratheesh , M.T. Sebastian and P. Mohanan, Proceedings of IX National Seminar on Ferroelectrics and Dielectrics, 1994, Nagpur.
6. Structure and dielectric properties of (Ba,Sr)Nb4O15 ceramics H. Sreemoolanadhan, R. Ratheesh and M.T. Sebastian, Proceedings of the National Symposium on Recent Advances in Microwaves and Lightwaves, Edited by Enakshi K. Sharma, New Age International Publishers, (New Delhi) 97-101 (1995)
7. A New High Permittivity and Low Loss Ceramic with BaO-3TiO2-2Nb2O5 Composition, R.Ratheesh, H. Sreemoolanadhan, S. Suma, M.T. Sebastian, K.A. Jose and P. Mohanan, Asia-Pacific Microwave conference, December 17-20, New Delhi, India (1996).
8. Vibrational spectra of three aluminium selenites Al2(SeO3)3.6H2O, Al2(SeO3)3.3H2O and AlH(SeO3)2.3H2O R.Ratheesh, M. Latha Nayar and V.U. Nayar, Proceedings of the Saha Centenary International Symposium on Spectroscopy and Astro Physics, October 4 to 6, 1993, Allahabad, India.
9. A New High Permittivity and High Q Dielectric Ceramic for Microstrip Applications R.Ratheesh, H. Sreemoolanadhan, M.T.Sebastian and P.Mohanan, International Meeting of the Pacific Rim Ceramic Societies, Cairns, Australia (1996).
10.Vibrational Analysis of Ga(HSeO3)(Se2O5) and Fe(HSeO3)3, R. Ratheesh, G. Suresh, V.U.Nayar, G. Giester and R.E. Morris, International Symposium on Spectroscopy, Jan. 3-5, BARC, Bombay, India (1996).
11.Temperature dependent Raman spectral studies on the internal modes of the Heteropolyanion [TeMo6O24]6- in M6[TeMo6O24].7H2O [ M= K, NH4] and NH6[TeMo6O24]Te(OH)6.7H2O Single Crystals. R. Ratheesh, G. Suresh and V.U. Nayar, Proceedings of the Natioanl Symposium on Spectroscopy, Varanasi (1994)
12.Vibrational Spectra of LiCs(PO3)2 and BaCs4(PO3)6 G. Suresh, R. Ratheesh, T. Pradeep and V.U. Nayar, Proceedings of the fifth Kerala Science Congress, 1993, Kerala, India
13.IR and Raman spectra of NaNi2(OH)(H2O)(MoO4)2 and NaNi2(OD)(D2O)(MoO4)2 R. Ratheesh, G. Suresh, T. Pradeep and V.U. Nayar, Proceedings of the fifth kerala Science Congress, 1993, Kerala, India
14.IR and Polarized Raman Spectra of MgTeO3.6H2O single crystal M. Abdul Sathar, R. Ratheesh and V.U. Nayar, Proceedings of the sixth Kerala Science Congress, 1994, Palghat, India.
15.Vibrational Analysis of Cu(HSeO3)2.H2O single Crystal at room and liquid nitrogen temperatures R.Ratheesh, G. Suresh, M.J. Bushiri and V.U. Nayar, Proceedings of the Symposium on Cryogenics, Aurangabad, 1995.
Dr.M.T.Sebastian
Dept. Ceramics & Materials Engineering
Clemson University Clemson,
SC 29634-0907 U.S.A. mts@CLEMSON.EDU
Dr. Micheal Tobar
Department of Physics University of Western Australia
WA 6907 AUSTRALIA
Tel: (08) 9380 2759
Email: mike@pd.uwa.edu.au
Prof. Dr. V.Unnikrishnan Nayar
Head Department of Optoelectronics University of Kerala
Kariavattom Trivandrum 695 581
Kerala India
E-Mail dlcampus@md2.vsnl.net.in
Prof.Dr. Roger Blachnik
Head Institut für Chemie Anorganische Chemie Universität Osnabrück D-49069
Osnabrück Germany
Fax: +49-541-969-2370
E- mail: rblachnik@uos.de
