TY  - JOUR
AU  - Golubović, Aleksandar
AU  - Gajić, Radoš
AU  - Nikolić, Slobodanka
AU  - Djurić, Stevan
AU  - Valčić, Andreja
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3498
AB  - LiNbO3 single crystals were grown by the Czochralski technique in an air
atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate of rotation wc
= 35 rpm were calculated from the dynamic of fluids equations for buoyancy-driven
and forced convections under which the shape of the melt/crystal interface changed. The
domain inversion was carried out at 1473 K using a 10 min 3.75 V/cm electric field.
The obtained crystals were cut, polished and etched to determine the presence of
dislocations and single domain structures. The lattice parameters a = 0.51494 nm, c =
1.38620 nm and V = 0.3186 nm
3
were determined by X-ray powder diffraction. The
optical properties were studied by infrared spectroscopy in the wave number range 20 
5000 cm
-1
. With decreasing temperature, an atypical behaviour of the phonon modes,
due to the ferroelectric properties of LiNbO3 single crystal, could be seen. The optical
constants were calculated by Kramers-Kronig analysis and the value of the critical
temperature was estimated. The obtained results are discussed and compared with
published data.
AB  - Monokristali LiNbO3 su dobijeni metodom rasta kristala po Čohralskom na
 vazduhu.Iz jednačina dinamike fluida za termičku i forsiranu konvekciju izračunati
 su kritični prečnik kristala Dc
 = 1,5 cm i vrednost kritične brzine rotacije wc = 35
 o/min pri kojima dolazi do promene oblika fronta kristalizacije. Monodomenizacija
 je obavljena na temperaturi od 1473 K, pri električnom polju od 3,75 V/cm u trajanju od
 10 minuta. Dobijeni kristali su sečeni, polirani i nagrizani da bi se odredilo
 prisustvo dislokacija i dobijanje monodomenske strukture. Rendgenskom difrakcijom
 praha odredjeni su parametri jedinične ćelije a = 0,51494 nm
 , c = 1,38620 nm i zapremina
 V = 0,3186 nm
 3
 .Optičke osobine su proučavane u infracrvenoj oblasti spektra u opsegu
 talasnih brojeva od 20–5000 cm
 –1
 . Refleksioni spektri su snimani na različitim
 temperaturama da bi se posmatrao položaj fononskih modova. Sa opadanjem temperature
 može da se vidi atipično ponašanje fononskih modova što se pripisuje feroelektričnim
  osobinama monokristala LiNbO3. Optičke konstante monokristala LiNbO3 su
 dobijene korišćenjem Kramers-Kronig analize i procenjena je vrednost kritične temperature.Dobijeni rezultati su diskutovani i uporedjivani sa podacima iz literature.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The crystallization and optical properties of LiNbO3 single crystals
T1  - Kristalizacija i optičke osobine monokristala LiNbO3
VL  - 65
IS  - 5-6
SP  - 391
EP  - 397
DO  - 10.2298/JSC0006391G
ER  - 

@article{
author = "Golubović, Aleksandar and Gajić, Radoš and Nikolić, Slobodanka and Djurić, Stevan and Valčić, Andreja",
year = "2000",
abstract = "LiNbO3 single crystals were grown by the Czochralski technique in an air
atmosphere. The critical crystal diameter Dc = 1.5 cm and the critical rate of rotation wc
= 35 rpm were calculated from the dynamic of fluids equations for buoyancy-driven
and forced convections under which the shape of the melt/crystal interface changed. The
domain inversion was carried out at 1473 K using a 10 min 3.75 V/cm electric field.
The obtained crystals were cut, polished and etched to determine the presence of
dislocations and single domain structures. The lattice parameters a = 0.51494 nm, c =
1.38620 nm and V = 0.3186 nm
3
were determined by X-ray powder diffraction. The
optical properties were studied by infrared spectroscopy in the wave number range 20 
5000 cm
-1
. With decreasing temperature, an atypical behaviour of the phonon modes,
due to the ferroelectric properties of LiNbO3 single crystal, could be seen. The optical
constants were calculated by Kramers-Kronig analysis and the value of the critical
temperature was estimated. The obtained results are discussed and compared with
published data., Monokristali LiNbO3 su dobijeni metodom rasta kristala po Čohralskom na
 vazduhu.Iz jednačina dinamike fluida za termičku i forsiranu konvekciju izračunati
 su kritični prečnik kristala Dc
 = 1,5 cm i vrednost kritične brzine rotacije wc = 35
 o/min pri kojima dolazi do promene oblika fronta kristalizacije. Monodomenizacija
 je obavljena na temperaturi od 1473 K, pri električnom polju od 3,75 V/cm u trajanju od
 10 minuta. Dobijeni kristali su sečeni, polirani i nagrizani da bi se odredilo
 prisustvo dislokacija i dobijanje monodomenske strukture. Rendgenskom difrakcijom
 praha odredjeni su parametri jedinične ćelije a = 0,51494 nm
 , c = 1,38620 nm i zapremina
 V = 0,3186 nm
 3
 .Optičke osobine su proučavane u infracrvenoj oblasti spektra u opsegu
 talasnih brojeva od 20–5000 cm
 –1
 . Refleksioni spektri su snimani na različitim
 temperaturama da bi se posmatrao položaj fononskih modova. Sa opadanjem temperature
 može da se vidi atipično ponašanje fononskih modova što se pripisuje feroelektričnim
  osobinama monokristala LiNbO3. Optičke konstante monokristala LiNbO3 su
 dobijene korišćenjem Kramers-Kronig analize i procenjena je vrednost kritične temperature.Dobijeni rezultati su diskutovani i uporedjivani sa podacima iz literature.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The crystallization and optical properties of LiNbO3 single crystals, Kristalizacija i optičke osobine monokristala LiNbO3",
volume = "65",
number = "5-6",
pages = "391-397",
doi = "10.2298/JSC0006391G"
}

Golubović, A., Gajić, R., Nikolić, S., Djurić, S.,& Valčić, A.. (2000). The crystallization and optical properties of LiNbO3 single crystals. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 65(5-6), 391-397.
https://doi.org/10.2298/JSC0006391G

Golubović A, Gajić R, Nikolić S, Djurić S, Valčić A. The crystallization and optical properties of LiNbO3 single crystals. in Journal of the Serbian Chemical Society. 2000;65(5-6):391-397.
doi:10.2298/JSC0006391G .

Golubović, Aleksandar, Gajić, Radoš, Nikolić, Slobodanka, Djurić, Stevan, Valčić, Andreja, "The crystallization and optical properties of LiNbO3 single crystals" in Journal of the Serbian Chemical Society, 65, no. 5-6 (2000):391-397,
https://doi.org/10.2298/JSC0006391G . .

TY  - JOUR
AU  - Nikolić, Pantelija M.
AU  - Todorović, Dragan M.
AU  - Vujatović, S.S.
AU  - Djurić, Stevan
AU  - Mihailović, P.
AU  - Blagojević, V.
AU  - Radulović, Katarina
AU  - Bojičić, A.I.
AU  - Vasiljević-Radović, Dana
AU  - Elazar, Jovan
AU  - Urošević, Dragan
PY  - 1998
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5762
AB  - Anisotropy in the thermal and electronic properties for two directions of a thermal wave propagation in GeSe2 single crystal was investigated using the photoacoustic frequency transmission technique. First, the electric field of an incident polarized light beam was adjusted to be perpendicular to the "c" axis (El⊥c), and then parallel to it (El//c) . It is shown that there is an obvious difference in the PA amplitude and phase spectra of the same sample, for cases when El//c and El⊥c axis. The results for thermal diffusivity DT obtained by fitting procedure for these two orientations of the electric field with regard to the "c" axis, are calculated: DT//=1.1×10-2 and DT⊥=1.7×10-3 cm2/s, e.g. their ratio is 6.6. The electronic transport parameters are also given: the carrier ambipolar diffusion coefficient D//=1.5 cm2/s and D⊥=2.5 cm2/s.
PB  - The Japan Society of Applied Physics
T2  - Japanese Journal of Applied Physics
T1  - Anisotropy in Thermal and Electronic Properties of Single Crystal GeSe2 Obtained by the Photoacoustic Method
VL  - 37
SP  - 4925
EP  - 4930
DO  - 10.1143/JJAP.37.4925
ER  - 

@article{
author = "Nikolić, Pantelija M. and Todorović, Dragan M. and Vujatović, S.S. and Djurić, Stevan and Mihailović, P. and Blagojević, V. and Radulović, Katarina and Bojičić, A.I. and Vasiljević-Radović, Dana and Elazar, Jovan and Urošević, Dragan",
year = "1998",
abstract = "Anisotropy in the thermal and electronic properties for two directions of a thermal wave propagation in GeSe2 single crystal was investigated using the photoacoustic frequency transmission technique. First, the electric field of an incident polarized light beam was adjusted to be perpendicular to the "c" axis (El⊥c), and then parallel to it (El//c) . It is shown that there is an obvious difference in the PA amplitude and phase spectra of the same sample, for cases when El//c and El⊥c axis. The results for thermal diffusivity DT obtained by fitting procedure for these two orientations of the electric field with regard to the "c" axis, are calculated: DT//=1.1×10-2 and DT⊥=1.7×10-3 cm2/s, e.g. their ratio is 6.6. The electronic transport parameters are also given: the carrier ambipolar diffusion coefficient D//=1.5 cm2/s and D⊥=2.5 cm2/s.",
publisher = "The Japan Society of Applied Physics",
journal = "Japanese Journal of Applied Physics",
title = "Anisotropy in Thermal and Electronic Properties of Single Crystal GeSe2 Obtained by the Photoacoustic Method",
volume = "37",
pages = "4925-4930",
doi = "10.1143/JJAP.37.4925"
}

Nikolić, P. M., Todorović, D. M., Vujatović, S.S., Djurić, S., Mihailović, P., Blagojević, V., Radulović, K., Bojičić, A.I., Vasiljević-Radović, D., Elazar, J.,& Urošević, D.. (1998). Anisotropy in Thermal and Electronic Properties of Single Crystal GeSe2 Obtained by the Photoacoustic Method. in Japanese Journal of Applied Physics
The Japan Society of Applied Physics., 37, 4925-4930.
https://doi.org/10.1143/JJAP.37.4925

Nikolić PM, Todorović DM, Vujatović S, Djurić S, Mihailović P, Blagojević V, Radulović K, Bojičić A, Vasiljević-Radović D, Elazar J, Urošević D. Anisotropy in Thermal and Electronic Properties of Single Crystal GeSe2 Obtained by the Photoacoustic Method. in Japanese Journal of Applied Physics. 1998;37:4925-4930.
doi:10.1143/JJAP.37.4925 .

Nikolić, Pantelija M., Todorović, Dragan M., Vujatović, S.S., Djurić, Stevan, Mihailović, P., Blagojević, V., Radulović, Katarina, Bojičić, A.I., Vasiljević-Radović, Dana, Elazar, Jovan, Urošević, Dragan, "Anisotropy in Thermal and Electronic Properties of Single Crystal GeSe2 Obtained by the Photoacoustic Method" in Japanese Journal of Applied Physics, 37 (1998):4925-4930,
https://doi.org/10.1143/JJAP.37.4925 . .