Clustering processes in oxide vitreous systems with 4f ions

 

Project CEEX MATNANTECH nr.47/2006
Director of project - Prof. dr. Eugen CULEA
Technical University of Cluj-Napoca

1.The research partnership

2.The target of the project

The study of new oxide vitreous systems with rare-earth ions:

  • Obtaining of samples from the Bi2O3-B2O3-R2O3 vitreous system with R=Gd, Eu
  • The study of the effects of V2O5 si Al2O3 addition and of heat treatments
  • Structural characterization of the samples; characterization of some of the physical properties of the samples
  • The study of the clustering process of the rare-earth ions 

 3. Planul de realizare al proiectului

    • Stage I-2006 Documentation study concerning the vitreous systems based on bismuth oxide, boron oxide and vanadium oxide (SVBBV). Structure, properties, technological applications. Elaboration of the obtaining method of SVBBV with 4f ions. Selection of the optimum method of preparation. Preliminary structural studies.
    • Stage II-2007: a.Characterization of the structure and properties and characterization of the clustering process of the 4f ions in the Bi2O3-B2O3-R2O3 vitreous system with R=Gd and Eu ions. The influence of the modifier oxide on the host vitreous matrix and on the clustering process of the 4f ions. b.The influence of the secondary network former oxide formatorului, V2O5 on the structure and physical properties and on the clustering of the 4f ions in the Bi2O3-B2O3-R2O3 vitreous system with R=Gd, Eu.
    • Stage III-2007: The effect of the preparation process parameters and of the heat treatment on the Bi2O3-B2O3-R2O3 vitreous system with R=Gd, Eu.
    • Stage IV-2008:a.Study of the influence of Al2O3 addition on the structure, properties and clustering process of 4f ions in the Bi2O3-B2O3-R2O3 vitreous systems with R=Gd and Eu. b.Synthesis and correlation of the results concerning the clustering process of 4f ions in oxide vitreous systems.

    The project was realised in agreement with the schedule.

     

5.Results

a. Sample preparation:

    Samples were obtained in the Bi2O3-B2O3-R2O3 vitreous system with R=Gd si Eu. The preparation was realized by mixing appropriate amounts of the constituent oxides, the melting of mixtures and the undercooling of the melts.

b. Experimental techniques and equipments

  • X ray diffraction (Shimadzu 6000 diffractometer);
  • IR spectroscopy (FTIR JASCO 6200 spectrometer, 400¸20.000 cm-1 range);
  • magnetic susceptibility measurements (Faraday type magnetic balance, 80¸300 K temperature range);
  • EPR spectroscopy (SE/X 2543 and Adani PS8400 spectrometers);
  • UV-Vis spectroscopy (Spekord and Camspec spectrometers, 10.000-30.000 cm-1range);
  • analiza termodiferentiala (analizor TD/TG JASCO 400);
  • density measurements (picnometric method)

c. Rezults

  • Structural information based on X ray diffraction, IR and EPR spectroscopy were obtained concerning the studied system. They were found out the compositional limits permiting the obtaining of the vitreous samples, respectively the compositions that lead to partially crystallized samples.
  • Information were obtained concerning some of the spectroscopic properties of the samples based on IR and UV-Vis data. IR data were used for the modelling of the molecular structure of the studied systems. During the modelling process theoretical IR spectra were obtained and were fitted to the experimental ones.
  • Information were obtaine concerning some physical properties of the studied systems (density, refractive index). The compositional variation of these properties was corellated with the structural changes occuring in the studied systems.
  • Information concerning the magnetic behaviour of the gadolinium and europium ions in the host vitreous matrix were obtained based on magnetic susceptibility measurements.
  • Information concerning the addition of V2O5 si Al2O3 on the structure and physical properties of the studied systems were obtained.

d. Publications based on the research results

    Publications in ISI journals

    1. I.Coroiu, Gh.Borodi, I.Vida-Simiti, Al.Darabont, I.Bratu, E.Culea, N.Jumate, Journal of Optoelectronics and Advanced Materials, Vol. 8, No. 2, 529,2006.
    2. E.Culea, I. Bratu, M. Bogdan, L. Giurgiu, I. Vida-Simiti, M. Culea, L. Pop, M. Bosca, Journal of Optoelectronics and Advanced Materials, Vol. 8, No. 3, 2006, 1140.
    3. E.Culea, L.Pop, R.Muntean, M.Bosca, I.Bratu, Modern Physics Letters B, 21, 3 (2007) 1-7.
    4. L.Pop, T.Ristoiu, N.Dempsey, M.Culea and E.Culea, Modern Physics Letters B 20 (30) (2007) 1957-1962.
    5. P.Pascuta, L. Pop, S.Rada, M. Bosca, E. Culea, J.Mater. Sci. Mater. Electronics, Online first, (2008) 19:424-428, DOI:10.1007/s10854-007-9359-5.
    6. Gh.Borodi, I.Bratu, S. Simon, Materials Letters 61, 4715 (2007).
    7. V.Simon, M.Todea, A.F.Takacs, M.Neumann, S.Simon, Solid State Commun. 141, 42 (2007).
    8. D.A.Udvar, S.Simon, J. Optoelectr. Adv. Mater. 9(3), 646 (2007).
    9. P. Pascuta, M. Bosca, S. Simon, E. Culea, Mod. Phys. Lett. B, 22, 6 (2008) 447-453.
    10. P.Pascuta, E.Culea, Materials Letters, 62 (2008) 4127-4129.
    11. S.Rada, M Culea, M. Neumann, E. Culea, Chem. Phys. Letters, 460 (2008) 196-199.
    12. S. Rada, E.Culea, M. Bosca, M. Culea, R. Muntean, P. Pascuta, Vib. Spectrosc., DOI:10.1016/j.vibspec2008.04.001.
    13. L.Pop, E.Culea, M.Bosca, M.Neumann, R.Muntean, P.Pascuta, S.Rada,J.Optoel.& Adv.Mat, vol.10, 3 (2008) 619-622.
    14. P.Pascuta, E.Culea, Materials Letters, 62 (2008) 4127-4129.
    15. S.Rada, M Culea, M. Neumann, E. Culea, Chem. Phys. Letters, 460 (2008) 196-199.
    16. P.Pascuta, M.Bosca, M.Culea, S.Simon, E.Culea, Modern Physics Let.B, 22, 6 (2008) 447-453.
    17. L.Pop, E.Culea, M.Bosca, M.Neumann, R.Muntean, P.Pascuta, S.Rada, J.Optoel.Adv.Mat, vol.10, 3 (2008) 619-622.
    18. E. Culea, M. Flora, J.Optoel.Adv.Mat, Vol. 10(9) (2008) 2413.
    19. P. Pascuta, M. Bosca, S. Rada, M. Culea, I. Bratu, E. Culea, J.Optoel.Adv.Mat, Vol. 10(9) (2008) 2416.
    20. P. Pascuta, M. Bosca, S. Rada, L. Pop, E. Culea, J.Optoel.Adv.Mat, Vol. 10(9) (2008) 2210.
    21. Maria Bosca, Lidia Pop,, Gheorghe Borodi, Petru Pascuta, Eugen Culea, J.Alloys & Compounds, 2009 doi:10.1016/j.jallcom.2009.01.001.
    22. Petru Pascuta, Gheorghe Borodi, Eugen Culea, J.Non-Cryst.Solids 354 (52-54) (2008) 5475. 23.S. Rada, M. Culea, E. Culea, J.Phys.Chemistry A 112(44), 2008, 11251.

    Publications in non-ISI journals

    1. L.Pop, E.Culea, M.Bosca, M.Culea, American Institute of Physics (AIP), April (2007) 679.
    2. L.Pop, E.Culea, M. Bosca, American Institute of Physics (AIP), Aprilie (2007) 591. 

    Publications in volums of scientific conferences

    1. E.Culea, E. Indrea, I. Bratu, E. Veress, M. Fábián, E. Sváb, Fith International Conf. on Inorganic Materials, Ljubljana, Slovenia, 23-26 September 2006, p.152.
    2. Lidia Pop, M.Bosca, E.Culea, A.Takacs, M.Neumann, Monica Culea, 10th Int.Conf.on Non-Crystalline Materials NCM10, September 18-22, 2006, Praha, Czech Republic, p.276.
    3. L.Pop, R.Fechete, P.Pascuta, S.Rada, M.Culea, M.Bosca, R.Chelcea, E.Culea, Conf.Int.Fizica TIM-06, 24-25 noiembrie 2006, Timisoara, pg.61.
    4. L.Pop, E.Culea, M.Culea, S.Rada, P.Pascuta, R.Fechete, M.Bosca, R.Chelcea, Conf.Int.Fizica TIM-06, 24-25 noiembrie 2006, Timisoara, pg.68.
    5. P.Pascuta, S.Rada, l.Pop, M.Pop, E.Culea, Conf.Int.Fizica TIM-06, 24-25 noiembrie 2006, Timisoara, pg.71.
    6. S. Rada, P. Pascuta, M. Bosca, L. Pop, E. Culea, 4th International Conference on Advanced Vibrational Spectroscopy, June 10-15, 2007, Corfu, Greece, pag. 235;
    7. P. Pascuta, M. Bosca, S. Rada, L. Pop, E. Culea, XXIst International Congress on Glass, July 1-6, 2007, Strasbourg, France, pag. 26;
    8. S. Rada, E. Culea, M. Bosca, P. Pascuta, XXIst International Congress on Glass, July 1-6, 2007, Strasbourg, France, pag. 27;
    9. S. Rada, E. Culea , P. Pascuta, M. Bosca, 8th International Balkan Workshop on Applied Physics, July 5-7, 2007, Constanta, Romania, pag. 225;
    10. M. N. Grecu, S. Constantinescu, S. Georgescu, A. M. Chinie, P. Pascuta, E. Culea , ICAME 2007 -Int.Conf. on Applications of Mosbauer Effect, Kampur, India, 14-19 octombrie 2007, p.308;
    11. V.Simon, O.Ponta, S.Simon, M.Neumann, PIM-2007, Int.Conf.on Progresses in Isotopic and Molecular processes, Cluj-Napoca, 20-22 septembrie 2007, p.87.
    12. Grecu Maria Nicoleta, Constantinescu Serban, Georgescu Serban, Chinie Ana, Pascuta Petru, Culea Eugen, 16th Int.Conf.on Defects in Insulating Materials ICDIM 2008, 24-29 August 2008, Aracaju, Brazil-A-173.
    13. E.Culea, L.Pop, M.Bosca, 3rd Adv.Spectroscopies on Biomedical and Nanostructured Systems, 7-10 sept.2008, Cluj-Napoca, p.111.
    14. P.Pascuta, M.Bosca, L.Pop, S.Rada, E.Culea, Adv.Spectroscopies on Biomedical and nanostructured Systems, 7-10 sept.2008, Cluj-Napoca, p.124.
    15. S.Rada, M.Culea, P.Pascuta, E.Culea, 3rd Adv.Spectroscopies on Biomedical and nanostructured Systems, 7-10 sept.2008, Cluj-Napoca, p.132.
    16. S.Rada, V.Maties, M.Rada, L.Pop, E.Culea, XXIX European Congress on Molecular Spectroscopy, 31 August-5 September 2008, p.85.
    17. E.Culea, L.Pop, M.Bosca, XXIX European Congress on Molecular Spectroscopy, 31 August-5 September 2008, p.157.
    18. P.Pascuta, S.Rada, Gh.Borodi, M.Bosca, L.Pop, E.Culea, XXIX European Congress on Molecular Spectroscopy, 31 August-5 September 2008, p.170.
    19. M.N.Grecu, S.Constantinescu, P.Pascuta, E.Culea, S.Georgescu, EUROMAR 2008, Magnetic resonance Conference, 6-11 July 2008, Sankt Petersburg, Rusia, p. 154.