Leonardas Žigas

Leonardas Žigas

Contact info:

dr. Leonardas Žigas
Faculty of Physic
Vilnius Pedagogical University
Vilnius, Lithuania

Phone:+370-2 79-00-43
Fax:    +370-2 75-17-32

Email: zigai@vpu.lt
           kkol@vpu.lt

WEB: www.vpu.lt
          www.ltmrs.lt/members/l_zigas

Leonardas Žigas was born in Trainiškio km. Ignalinos raj., Lithuania, in 1953. (1953 04 11)
He received the diploma of Physicist and of Physics Teacher at Vilnius Pedagogical University in 1978
and the Ph.D. degree in Physics in 2001, also at VPI.
Then he continued working at Vilnius Pedagogical University (VPI), while presently he is a researcher at Faculty of Main Physics of Vilnius Pedagogical University.
Leonardas Žigas has authored more than 30 scientific papers.

Field of scientific studies :

VPU General Physic “Solid State Optical Scientific labaratory” Science Employee.
Works with Fourier spectrometer LAFS-1000, messurement range (10 - 550 cm-1).
Spectra calculation using Kramers -Kronig method.
Calculation of Potencial energy of crystals atomic unit cell.

Some publications :

^{A. Audzijonis, V. Paulikas, L.
Žigas, A. Stasiukynas, J. Narušis, S. Kvedaravičius.

Ferroelectric phase tranzition in SbSI type crystals

Phase Transitions. 67. p. 437-446, 1998.
A. Kajokas, J. Grigas, A.
Brilingas, J, Banys, K. Lukaszewicz, A. Audzijonis, L. Žigas.

Origin of anomalies of physicals properties in Bi₂S₃
crystals

Lithuanian Journal of Physics, 39, N 1, p. 45. 1999.
J. Grigas, A. Kajokas, A.
Audzijonis and L. Žigas.

Peculiarites and properties of SbSI electroceramcs

Journal of the European Ceramic Society, 21, 1337-1340, 2001.
A. Audzijonis, L. Žigas, R.
Žaltauskas, J. Narušis and L. Audzijonienė.

Electronic potentials of normal vibration modes in SbSI crystals

Ferroelectrics, 274, p. 1-15, 2002.

A. Audzijonis, G. Gaigalas, V. Lazauskas, L. Žigas, J. Narušis, A. Pauliukas

Electron- phonon interaction in the SbSI atomic chain.

Lithuanian Journal of Physics 42, N 6, 421-425 (2002).
A. Audzijonis, L. Žigas, J.
Siroicas, J. Narušis, R. Žaltauskas, A. Pauliukas, A. Čerškus, R. Šadžius.

Investigation of the soft mode of SbSBr_xI_1–x crystals

Ferroelectrics, 300, 15-31 (2004).
A. Audzijonis, L. Žigas , J.
Siroicas, R. Žaltauskas, A. Pauliukas and A. Čerškus.

Investigation of vibrational spektra of SbO_xS_1-xI
crystals in the phase transition region,

Ferroelectrics, 308, 113-129 (2004).
A. Audzijonis, G. Gaigalas, V.
Lazauskas, L. Žigas, J. Narušis, A. Pauliukas.

Electron–phonon interaction and Jahn–Teller effect in the SbSI atomic chain

Physica B – Condensed matter , 351 , 1-2, 27-34, (2004) . ISSN
0921-4526
A. Audzijonis, L. Žigas, J.
Siroicas, A. Čerškus, A. Pauliukas.

Origin of soft mode in SbSe_xS_1–xI crystals

Physica B – Condensed matter , 351 , 1-2, 35-44, (2004).
A. Audzijonis, L. Žigas, R.
Žaltauskas, V. Paulikas and A. Pauliukas.

Growing and investigation of vibrational spectra in the SbO_xS_1–xI
crystals in the phase transition region

Lithuanian Journal of Physics 44, N 5, 399-402 (2004).

A. Audzijonis, L. Žigas , J. Narušis, N. Mykolaitienė, D. Balnionis, A.
Čerškus A. Pauliukas.

Investigation of the anharmonicity of normal vibrational modes in Sb₂S₃
cluster

Lithuanian Journal of Physics, 44, N. 6, 447-450 (2004).

A. Audzijonis, G. Gaigalas, V. Lazauskas, L. Žigas, J. Narušis, A. Pauliukas.

Electron–phonon interaction and Jahn–Teller effect in the SbSI atomic chain

Physica B – Condensed matter , 351 , 1-2, 27-34 (2004).

A. Audzijonis, L. Žigas, J. Siroicas, A. Čerškus, A. Pauliukas.

Origin of soft mode in SbSe_xS_1–xI crystals

Physica B – Condensed matter , 351 , 1-2, 35-44 (2004).

A. Audzijonis, L. Žigas, G. Gaigalas, V. Paulikas, R. Žaltauskas, A. Čerškus,
D. Balnionis.

The nature of soft mode and ferroelectric phase transition in SbO_xS_1–xI
and SbSe_xS_1–xI mixed crystals

Ferroelectric Letters 31, 5-6, 113-118 (2004).

A. Audzijonis, G. Gaigalas, V. Lazauskas, L. Žigas, J. Narušis, N.
Mykolaitienė and A. Pauliukas.

Jahn-Teller efect in the SbSBr crystals atomic chain

Phase Transitions 77, 11 941-954 (2004).

A. Audzijonis, G. Gaigalas, L. Žigas, J. Narušis, A. Pauliukas, R. Žaltauskas
and A. Čerškus.

Splitting of the XPS in Ferroelectric SbSBr crystals

Ferroelectric Letters 32, 5-6, 111-118 (2005).

A. Audzijonis, G. Gaigalas, L. Žigas, A. Pauliukas, R. Žaltauskas, A. Čerškus
and J. Narušis.

Theoretical investigation of the electronic structure of ferroelectric SbSI
cluster at phase transition

Central European Journal of Physics 3, 3, 382-394 (2005).

A. Audzijonis, R. Žaltauskas, L. Žigas, I.V. Vinokurova, O.V. Farberovich, A.
Pauliukas, A. Kvedaravičius.

Variation of the energy gap of the ferroelectric SbSI crystals at phase
transition

Physica B – Condensed matter 371 68-73 (2006).

A. Audzijonis, L. Žigas, I. V. Vinokurova, O. V. Farberovič, R. Žaltauskas, E.
Čijauskas, A. Pauliukas, A. Kvedaravičius.

Investigation of the vibration spectrum of SbSI crystals in harmonic and in
anharmonic aproximations

Physica B – Condensed matter 373, 1, 157-162 (2006).

Audzijonis, L. Žigas, J. Siroic, A. Pauliukas, R. Žaltauskas, A. Čerškus and
J. Narušis.

Investigation of the electronic structure of the SbSeI cluster

Physica Status Solidi (b) 243, 3 610-617 (2006).

International conferences :

A. Audzijonis, J. Grigas, A.
Kajokas, S. Kvedaravičius, V. Paulikas and L. Žigas.

Origin of Ferroelectric phase tranzition in partly disordered modified SbSI
crystals,

“Molekulių dinamika ir faziniai virsmai”, Vilnius, 65 (1999).
J. Grigas, A. Kajokas, A.
Audzijonis and L. Žigas.

Peculiarities and properties of SbSI electroceramics,

“Electroceramics VII 2000”, Portorož, Slovenia, 59 (2000).
J. Grigas, A. Audzijonis, A.
Kajokas and L. Žigas.

Modified SbSI Ferroelectric: peculiarities and properties.

“XXV International school Ferroelectric physics”, Krakow, Poland, 16 (2000).
B. Schatz, M. Goppert, C.
Maier, R. Becker, R. Žaltauskas, L. Žigas, A. Audzijonis und C. Klingshim.

Ubergang zwischen paraelektrischer und ferroelektrischer Phasse im
V-VI-VII-Halbleitersystem SbSe_xS_1-xI.

“E-Verhandlungen 2000 Programm und Abstracts der Sitzung HL 38”, Deutsche, 16
(2000).}

Patents:

The co-author of seven patents. The latest two of them:

A. Audzijonis, A. Stasiukynas, L. Žigas ir k.t.
Bangiškai moduliuotos šviesos spektrofotometras.
Patentas Nr. 4762 (paskelbtas 2001 02 26).

A. Audzijonis, A. Stasiukynas, L. Žigas ir k.t.
Kristalo moduliuotos šviesos atspindžio ir sugerties koeficientų matavimo būdas.
Patentas Nr. 4876 (paskelbtas 2001 12 27).

Keywords:

SbSI; Sb₂S₃; Bi₂S₃; Bi_xSb_1-xI; SbSe_xS_1-xI; SbSBr_xI_1-x;
potencial energy; normal modes; phase transition; ferroelectric properties; LAFS-1000.

Leisure :

Huntig,
The author of www.medziokle.lt web site..

Last updated: 01.04.2006