Fyzikální ústav Akademie věd ČR

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Research subjects of department 32

Growth of single crystals

Development of crystal growth technologies using the technique of Czochralski, homogeneous crystals growth conditions for PbWO₄ and for the tungstates of alcaline earths AWO₄ (A = Ca, Sr, Ba); defects in crystals; growth of doped crystals, growth conditions for PbWO₄ single crystals doped at a high level (several percents) by rare earth elements; growth of non-stoichiometric PbWO₄ single crystals and study of their absorption and emission centers. The full text >>

Scintillation materials

Preparation and study of powder materials and ceramics based on some hafnates and aluminates, pure or doped by rare earth elements (Ce, Pr, Eu, Tb) and by some other dopes (Pb, Bi). The starting powder materials are in case of the hafnates (SrHfO₃, Lu₄Hf₃O₁₂) prepared via reaction in the solid state at higher temperatures, the lutetium and yttrium garnets (Lu₃Al₅O₁₂, Y₃Al₅O₁₂) are precipitated from solutions. The full text >>

Synthesis of ferroelectric and antiferroelectric liquid crystals

Methods of synthesis of the liquid crystals having the rod like form molecules and equipped with alkoxypropionate or alkyllactate chiral ending. Study of influence of the lateral substitution by the groups CH₃, OCH₃, Cl, Br, or F on the occurrence area of the phase SmC*. Synthesis of the non-chiral liquid crystals composed of the bent-shaped (bent-core, banana shaped) molecules. The synthesis of the photosensitive liquid crystalline materials the molecules of which contain in their mesogenic core a double bond of the stilbene type or an azo group. The full text >>

Preparation of the monomers with liquid-crystalline features

The synthesis method development of the chiral monomers with the liquid-crystalline features which have a terminal double bond, an acrylate group, or terminal hydroxy groups. In cooperation with other groups within the frame of the project COST preparation of grafted liquid crystalline polymers of siloxane, acrylate or urethane types. The full text >>

Chromatographic determination of impurities and their elimination using the high pressure liquid chromatography

Application of the high pressure liquid chromatography (HPLC) at the determination of impurities contents in liquid crystalline materials of all types beforehand the measurement of their physical characteristics. Chromatographic determination of the E-Z isomer ratio for the photosensitive liquid crystalline materials. Utilisation of preparative HPLC for reaching an extreme purity of liquid crystalline substances. The full text >>

Study of photochemical behaviour of fullerenes

Separation and determination of fullerenes by the HPLC method using Cosmosil Buckyprep stationary phase for study of photochemical degradation of the C₆₀ a C₇₀ fullerenes. Determination of traces of C₆₀ in natural geological materials. The full text >>

Chemical analyses of inorganic materials

The decomposition methods development and analysis of less common oxide type materials (e.g. PbWO₄, KTaO₃, LiNbO₃), and determination of trace impurities and doping elements in those materials. Determination of impurities and of main components in metals and alloys. Analyses of lead chlorides and bromides and of their mixtures, and determination of metallic impurities and of oxygen in these materials. The full text >>