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Macroconch ammonites from the Štramberk Limestone deposited in the collections of the Czech Geological Survey (Tithonian, Outer Western Carpathians, Czech Republic)

Vašíček Zdeněk, Malek Ondřej

Volumina Jurassica

2019

Vol. 17, no. 1

81--94

11 specimens of large sized ammonites from the Štramberk Limestone deposited in the collections in Prague represent 6species. Two species belong to the superfamily Lytoceratoidea, the remaining ones to the superfamily Perisphinctoidea. The perisphinctid specimens belong to the Lower and the Upper Tithonian, and the lytoceratids probably correspond to the same stratigraphic level. Two species, namely Ernstbrunnia blaschkei and Djurjuriceras mediterraneum were not known from the Štramberk Limestone earlier.

On the defect structure of alkaline earth titanates.

Komornicki S.

Inżynieria Materiałowa

1998

R. XIX, nr 4

819-822

Nonstoichiometry in strontium titanate as an example of alkaline earth titanates was discussed in terms of Sr/Ti ratio and dopant concentration and extended defect existence. For some dopant concentrations and titanium or strontium excess a self-compensation of cation and anion vacancies could be observed, leading to unusual pressure dependencies of electrical conductivity.

Defect-related properties of SrTiO3.

Pasierb P., Komornicki S., Rękas M.

Inżynieria Materiałowa

1998

R. XIX, nr 4

848-851

The defect structure and the chemical diffusion coefficients Dchem were determined in Ti excess undoped and Nb doped SrTiO3 thin films as well as in undoped SrTiO3 single crystal (1 0 0). The observed difference in Dchem was explained basing on the defect structure models. In both cases of SrTiO3 thin films, the low-mobility strontium vacancies are the predominant defects, while in case of SrTiO3 single crystal the high-mobility oxygen vacancies are responsible for the much faster oxygen gradient decay.