Giuseppe Dalba

 Department of Physics
Faculty of Sciences
University of Trento
Via Sommarive 14,  I-38100 Povo (Trento), Italy


fax: +39-0461-881696
tel : +39-0461-881570

 

e-mail: giuseppe.dalba@unitn.it

http://alpha.science.unitn.it/~rx/raggi_x/index.html



 

Research topics

 

Ř  Local structure and dynamics in crystalline and non-crystalline solids, studied by correlation-sensitive probes, such as EXAFS

Ř  Local behaviour of negative thermal expansion in solids

Ř  Characterization of the local structure of luminescent materials (Porous Silicon, Si based nanosystems, rare-earth doped compounds) and its influence
on photo and electro-luminescence.

Ř  Characterization of thermal and static disorder in  amorphous systems.

Ř  Research on the relationship between local structure and ionic conduction properties of supersonic glasses.

Ř  Study of the local environment of highly diluted doping elements, belonging to III and V group, in thin films of hydrogenated amorphous germanium.

Ř  Refining the knowledge of the effects of thermal disorder on EXAFS spectroscopy

Ř  Study of luminescent nanostructures excited by synchrotron radiation carried outby  SNOM microscopy

Some recent publications

 

-S. I. Ahmed, G. Dalba, P. Fornasini,  M. Vaccari, F. Rocca, A. Sanson, J. Li and A. W. Sleight
Negative thermal expansion in crystals with the delafossite structure: An extended x-ray absorption fine structure study of CuScO2 and CuLaO2,
Phys. Rev. B 79, 104302 (2009) 

- A. Sanson, F. Rocca, C. Armellini, G. Dalba, P. Fornasini, and R. Grisenti;  Correlation between I-Ag distance and ionic conductivity in AgI fast-ion conducting glasses, 
Phys. Rev. Lett. 101, 155901 (2008).
-J. Purans, N. D. Afify, G. Dalba, R. Grisenti, S. De Panfilis, A. Kuzmin, V. I. Ozhogin, F. Rocca, A. Sanson, S. I. Tiutiunnikov, and P. Fornasini; Isotopic effect in extended x-ray-absorption fine structure of germanium,
Phys. Rev. Lett., 100, 055901 (2008)

-G. Dalba, N. D. Afify, F. Rocca; X-ray absorption spectroscopy studies of glass structure
Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B, June 2008, 49 (3), 149–15
-A. Sanson, F. Rocca, G. Dalba, P. Fornasini, and R. Grisenti; Influence of temperature on the local structure around iodine in fast-ion-conducting AgI:Ag2MoO4 glasses.
New Journal of Physics, 9, 88 (2007).
-N. D. Afify, G. Dalba, C. Armellini, M. Ferrari, F. Rocca, A. Kuzmin; Local structure around Er 3+ in SiO2-HfO2 glassy waveguides using EXAFS, Phys.  Rev. B 76, (2007) 024114
-N. Daldosso, G. Das, S. Larcheri, G. Mariotto, G. Dalba, L. Pavesi, A. Irrera, F. Priolo, F. Iacona and F. Rocca; Silicon nanocrystal formation in annealed silicon-rich silicon oxide films prepared by plasma enhanced chemical vapor deposition
J. Appl. Phys. 101, 113510 (2007)
-G.Dalba, P. Fornasini, R. Grisenti, F. Rocca, N. Afify, and M. Affatigato; XAFS study of the local  order and mobility of Pb in PbO borate glasses. 
Phys. Chem. Glasses: Eur. J. Glass Sci. Technol. B, 47, 518-520 (2006).
-A. Sanson, F. Rocca, G. Dalba, P. Fornasini, R. Grisenti, M. Dapiaggi, G. Artioli; Negatine thermal expansion and local dynamics in Cu2O and Ag2O, Phys. Rev. B 73, 214305 (2006)
-A. Kuzmin, G. Dalba, P. Fornasini, F. Rocca, O. Sipr; X-ray absorption spectroscopy of strongly disordered glasses: local structure around Ag ions in g-Ag2O.nB2O3,
Phys. Rev. B 73, 174110 (2006).

Other papers

 

Teaching activity


Courses
- General Physics: Electricity and magnetism
-  Interaction of X-ray with matter

 

Book:
 G. Dalba, P. Fornasini: Esercizi di Fisica: Meccanica e Termodinamica, Springer, Milano (2006)
 

Recent invited talks, memberships, …

 

- X-ray absorption spectroscopy applications,  7th SESAME User Meeting Cairo, Egypt (December 2008)

- X-Ray Absorption Spectroscopy Studies of Glass Structure , XXIst International Congress on Glass - Strasbourg – France (July) (2007).

- Nano-scale chemical mapping and surface structural modification by joined use of X-ray microbeams and tip assisted local detection.

 “5th SESAME User Meeting” Alexandria, Egypt (December 27-29 Nov. 2006)

- The vitreous structure and its investigation by x-ray techniques utilizing synchrotron radiation - Er doped waveguidesfor optical amplifiers

  8th Otto Shott Colloquium, 2006 Jena, Germany

- Organizer and co-chairman of the first nd second  “African School and Workshop on X-rays in Materials. 2005,  2009 Dakar-Senegal

- Organizer of the Vth International conference on Borate Glasses Crystals and melts: new techniques and practical applications; G. Dalba, A.C. Wright Proceedings  Society of   Glass technology , 2008

- Co-chairman della conferenza: “Total Reflection X-Ray Fluorescence Analysis. and Related Methods” Trento, Italy (18-22 June 2007).

- Member of scientific committee of the International Borate glasses and melts conference
- Member of the Gilda facility at the European synchrotron radiation facility- Grenoble (France)

- Member of the Technical Committee (IGC-TC3) "Basic Glass Science" of the international Commission on Glass

- Coordinator of PhD in Physics  (University of Trento, (2004 -2007t)
- Director of the Physics department of the University of Trento (2009)

June 2009