National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Determination of temperature dependence of pyroelectric coefficient and permitivity TGS trough approximation function
Zelinka, Jiří
Technical report describes the numerical method emploeyd for evaluation of properties of tryglicinium sulfate based pyroeletric materials prepared in the IREE. The raw experimental data related to temperature dependence of capacitance and of the polarization curves of the samples are interpolated using appropriate approximation function. The program optimizes parameter values of the function expressing the permitivity and the pyroelectric coefficient.
Technology of infrared detectors preparation on the basis of LATGS/Pt/IV/ and LADTGS/Pt/II/ single crystals
Novotný, Jan ; Zelinka, Jiří ; Franc, J.
Single crystals of triglycine sulphate /TGS/ and deuterated TGS doped with Pt.sup.4+.sup. and Pt.sup.2+.sup. and L-alanin, /LATGS/Pt/IV/ and LADTGS/Pt/II/ were grown from aqueous solutions. Surface morphology, domain structure and P-E hysteresis loops have been investigated. We have found on the basis of experimental results that prepared single crystals are very suitable materials for construction on infrared detectors.
Preparation and properties of pyroelectric detectors for optoelectronic applications /III/
Novotný, Jan ; Zelinka, Jiří ; Podvalová, Zdislava ; Malina, Václav ; Vávra, Vladimír ; Franc, J. ; Fronc, Václav ; Fronc, Václav
The single crystals of TGS doped with Pt-ions and with L-alanine were grown as in ferroelectric phase as the full-shaped crystals. The growth rate along the axis c of the doped crystals is much higher than in an undoped one. Morphology, domain structure and hysteresis loops were investgated. The effect of the dopant on the growth velocity is explained on the basis of catalytic action of platinum complexes. The pyroelectric detectors were prepared from these materials and their parameters are presented.
Technology LATGS/PtIV single crystal for high sensitivity infrared detectors
Novotný, Jan ; Franc, J. ; Zelinka, Jiří
Single crystals of TGS doped with Pt/IV/ and L-alanin were grown from aqueous solutions. Surface morphology, domain structure and P-E hysteresis loops have been investigated. We have found that LATSGS/Pt/IV/ crystals are excellent materials for construction of infrared detectors.
Crystal growth from low-temperature solutions - theory and experiments
Novotný, Jan
Growth of crystals from low-temperature solutions belong to extended methods to acquire of high quality single crystals. Presented work reports the basic theories of crystal growth from solutions and shows their applications to optimization of crystal qrowth conditions where goal is preparation of high quality of single crystals. Next are shown experimental results of preparation of optical non-linear crystals for optoelectronics obtained at crystal growth laboratory of IREE AS CR.

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