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Structural Properties and Temperature Behaviour οf Optical Absorption Edge in Polycrystalline ZnO:X (Cu,Ag) Films

100%

Kulyk B., Figà V., Kapustianyk V., Panasyuk M., Serkiz R., Demchenko P.

Acta Physica Polonica A

2013

vol. 123

issue 1

92-97

Silver- and copper-doped ZnO films were prepared by radio-frequency magnetron sputtering on glass substrates. The influence of dopants content on the structural, morphological properties as well as on evolution of the optical absorption edge was considered. It has been found that Ag- and Cu-doped ZnO films are characterized by wurtzite crystalline structure with the preferred direction of crystalline orientation (002). The sizes of grains within the films were found to be dependent on the type of dopant. The temperature evolution of the optical absorption edge is described by the modified Urbach rule that reflects polycrystalline nature of the material. The corresponding parameters concerning electron- (exciton-) phonon interaction, phonon energies and temperature changes of the band-gap were determined and analysed.

Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals

84%

Kapustianyk V., Eliyashevskyy Y., Czapla Z., Dacko S., Czupiński O., Rudyk V., Serkiz R., Sereda S., Semak S.

Acta Physica Polonica A

2015

vol. 127

issue 3

791-794

This paper presents the results of investigations of the temperature dependence of heat capacity and dielectric dispersion in the vicinity of ferroelectric-ferroelastic phase transition of dimethylammonium metal sulphate hexahydrate crystals DMAAl_{1-x}Cr_{x}S. In particular, it is shown that the isomorphous substitution of metal ion noticeably changes the temperature of phase transition and parameters of the fundamental ferroelectric dispersion observed around T_{c1}. These changes are explained in terms of clusters sizes and dynamics in the framework of order-disorder type phase transition mechanism.

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2 Acta Physica Polonica A

1 2015

1 2013

2 Kapustianyk V.

2 Serkiz R.

1 Czapla Z.

1 Czupiński O.

1 Dacko S.

1 Demchenko P.

1 Eliyashevskyy Y.

1 Figà V.

1 Kulyk B.

1 Panasyuk M.

1 Rudyk V.

1 Semak S.

1 Sereda S.

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Structural Properties and Temperature Behaviour οf Optical Absorption Edge in Polycrystalline ZnO:X (Cu,Ag) Films

Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_{1-x}Cr_{x}S Crystals