A5012784505- Luminescence Properties of Advanced Materials
- Solid-state spectroscopy and crystallography
- Crystal Structures and Properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Glass properties and applications
- Solid State Laser Technologies
- Nonlinear Optical Materials Research
- Lanthanide and Transition Metal Complexes
- Magnetism in coordination complexes
- Photorefractive and Nonlinear Optics
- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Nuclear materials and radiation effects
- Advanced Condensed Matter Physics
- Crystallography and molecular interactions
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Photochemistry and Electron Transfer Studies
- Transition Metal Oxide Nanomaterials
- Multiferroics and related materials
- Thermal Expansion and Ionic Conductivity
- Inorganic Fluorides and Related Compounds
- Crystal structures of chemical compounds
- Metal complexes synthesis and properties
- Synthesis and Characterization of Heterocyclic Compounds
Włodzimierz Trzebiatowski Institute of Low Temperature and Structure Research
2013-2025
Polish Academy of Sciences
2015-2024
University of Wrocław
1966-2021
Wroclaw University of Economics and Business
2011-2020
University of Electro-Communications
2014
Wrocław University of Science and Technology
2012
National Veterinary Research Institute
1989-2007
Center for Research and Advanced Studies of the National Polytechnic Institute
2005
International Laboratory of High Magnetic Fields and Low Temperatures
2005
Utrecht University
1995
We report the synthesis, crystal structure, thermal, dielectric, Raman, infrared, and magnetic properties of hydrogen deuterated divalent metal formates, [(CH3)2NH2][M(HCOO)3] [(CH3)2ND2][M(HCOO)3], where M = Ni, Mn. On basis Raman IR data, assignment observed modes to respective vibrations atoms is proposed. The thermal studies show that for Ni compounds deuteration leads a decrease phase transition temperature Tc by 5.6 K, whereas it has negligible effect on in Mn analogues. This behavior...
Flavonoids are a group of secondary plant metabolites important for growth and development. They show also protective effect against colon breast cancer, diabetes, hypercholesterolemic atherosclerosis, lupus nephritis, immune inflammatory reactions. Thus, overproduction these compounds in flax by genetic engineering method might potentiate biotechnological application products. Flax plants third generation overexpressing key genes flavonoid pathway cultivated field were used as material...
Vibrational properties and the temperature-induced phase transition mechanism have been studied in [NH4][Zn(HCOO)3] [ND4][Zn(DCOO)3] metal organic frameworks by variable-temperature dielectric, IR, Raman measurements. DFT calculations allowed proposing detailed assignment of vibrational modes to respective motions atoms unit cell. Temperature-dependent studies reveal a very weak isotopic effect on temperature confirm that ordering ammonium cations plays major role transition. We also present...
We show that doping of multiferroic formates with various trivalent cations is a new route for the synthesis tunable luminescent multiferroics.
A novel formate [(CH3)2NH2][Na0.5Cr0.5(HCOO)3] (DMNaCr) was prepared by a solvothermal method. This compound crystallizes in the perovskite-type metal framework (space group R3[combining macron]) with disordered dimethylammonium (DMA(+)) cations. X-ray diffraction, DSC, Raman and IR studies show that contrast to isostructural iron analogue [(CH3)2NH2][Na0.5Fe0.5(HCOO)3] (DMNaFe), DMNaCr does not exhibit any structural phase transition at low temperatures. behavior has been attributed smaller...
A temperature-dependent Raman study of ${\text{Ho}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$ and ${\text{Dy}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$ single crystals was performed in the 5--873 K temperature range. Polarized spectra allowed us to establish symmetries observed bands revise mode assignment made previous works. Our studies revealed also two additional near 287 $300\text{ }{\text{cm}}^{\ensuremath{-}1}$ for ${\text{Dy}}_{2}{\text{Ti}}_{2}{\text{O}}_{7}$, which can be assigned crystal field...
Abstract The temperature‐dependent Raman studies of A 2 Ti O 7 (A = Dy, Er, Gd) were performed on single crystals and polycrystalline samples in the 4.2–295 K temperature range. spectra showed softening majority phonon modes upon cooling whole range studied large decrease linewidths. These changes have been analyzed terms strong third‐order phonon–phonon anharmonic interactions. Moreover, 312 330 cm −1 Er (Gd ) hardening down to about 130 (100 K) then anomalous below this temperature....
Bi 2 W O 6 ferroelectric single crystal was investigated by micro-Raman scattering and infrared spectroscopies. Symmetry of modes established the mode assignment proposed.
Two new 2-N-phenylamino-(4 or 6)-methyl-3-nitropyridine derivatives were synthesized. Their structures characterized on the basis of X-ray diffraction, IR, and Raman spectra as well electron UV-Vis emission measurements. The experimental results analyzed in terms theoretical data which quantum chemical DFT NBO calculations applied. To elucidate relaxation pathways electronically excited states, multiple excitation wavelengths employed to probe energy dissipation mechanisms studied compounds....
High-pressure Raman scattering and luminescence studies of ${\mathrm{Bi}}_{2}\mathrm{W}{\mathrm{O}}_{6}:{\mathrm{Eu}}^{3+}$, which is a member the bismuth layered Aurivillius family ferroelectrics, are presented. These showed onset two reversible second order phase transitions near 3.4 $6.2\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. The pressure dependence bands provides strong evidence that first transition involves loss $\mathrm{W}{\mathrm{O}}_{6}$ tilt mode around pseudotetragonal axis....
In recent decades cultivation of flax and its application have dramatically decreased. One the reasons for this is unpredictable quality properties fibre, because they depend on environmental factors, retting duration growing conditions. These factors contribution to fibre composition, which consists cellulose, hemicelluloses, lignin pectin. By far, it largely established that in flax, reduces an accessibility enzymes either pectin, hemicelluloses or cellulose (during biofuel synthesis paper...
Studies of perovskite-like [C<sub>3</sub>N<sub>2</sub>H<sub>5</sub>][Mg(HCOO)<sub>3</sub>] revealed a temperature-induced phase transition at 451 K and pressure-induced transitions near 3 7 GPa.
Thirteen edible oils: sunflower, avocado, hemp, high-linolenic flax, low-linolenic safflower, walnut, roasted sesame, rice, corn, rapeseed, pumpkin seed, and hazel were studied in this work. Their fatty acid composition, iodine, acidic, peroxide, saponification values determined. Infrared Raman spectra of the oils recorded range 400–3200 cm−1. The integral intensities bands at about 1655 2852 cm−1 corresponding to ν(C=C) ν(CH2) vibrations evaluated used construct a relationship between...