Browsing Zinātniskie raksti (CFI) / Scientific articles by Title
Now showing items 372-391 of 514
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Polarization and acoustic properties of barium-modified lead-free potassium–sodium niobate ceramics
(Estonian Academy Publishers, 2017)Results of polarization and polarization switching in samples prepared by solid phase synthesis of the (1-х)(K0.5Na0.5)(Nb0.93Sb0.07)O3–xBaTiO3 + 0.5mol%MnO2 system at x = 0.01, 0.02, and 0.04 (KNNS7–xBT) studied over a ... -
Portable low-cost open-source wireless spectrophotometer for fast and reliable measurements
(Elsevier Ltd, 2020)We demonstrate a low-cost standalone portable spectrophotometer for fast and reliable measurement execution. The data acquired can be both displayed via a dedicated smartphone application or a computer interface, allowing ... -
Positron annihilation lifetime spectroscopy insight on free volume conversion of nanostructured MgAl2 O4 ceramics
(Multidisciplinary Digital Publishing Institute (MDPI), 2021)Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials. Choosing technological modification of ... -
Post deposition annealing effect on properties of CdS films and its impact on CdS/Sb2Se3 solar cells performance
(Frontiers Media, 2023)Antimony selenide (Sb2Se3) is one of the emerging photovoltaic absorber materials possessing abundance and non-toxicity as the main attributes. Following CdTe technology, CdS is a widely used partner layer for Sb2Se3 solar ... -
Preparation and dielectric properties of (Na0.5K0.5)NbO3 ceramics with ZnO and CdO addition
(Taylor and Francis Ltd., 2019)The sintering conditions, phase structure, and electrical properties of the ZnO and CdO doped (Na0.5K0.5)NbO3 (NKN) ceramics were investigated and discussed. All the samples were prepared by a solid state reaction method. ... -
Probing densified silica glass structure by molecular oxygen and E’ center formation under electron irradiation
(Nature Research, 2023)This study aims to learn more about the structure of densified silica with focus on the metamict-like silica phase (density = 2.26 g/cm3) by examining the formation of E’ point defects and interstitial molecular oxygen O2 ... -
Probing the Thermochromic Phase Transition in CuMoO4 by EXAFS Spectroscopy
(Wiley-VCH Verlag, 2018)Extended X-ray absorption fine structure (EXAFS) spectroscopy at the Mo K-edge is used to follow the thermochromic γ-to-α phase transition in copper molybdate (CuMoO4). The temperature dependence (10–300 K) of the radial ... -
Production of Phosphorescent Coatings on 6082 Aluminum Using Sr0.95Eu0.02Dy0.03Al2O4-δ Powder and Plasma Electrolytic Oxidation
(MDPI AG, 2019)In this study, a new approach for producing phosphorescent aluminum coatings was studied. Using the plasma electrolytic oxidation (PEO) process, a porous oxide coating was produced on the Al6082 aluminum alloy substrate. ... -
Programmable material testing device for mechanoluminescence measurements
(Elsevier, 2022)Mechanoluminescent materials transform mechanical energy into visible light. Phenomena could prove to be advantageous to various next-generation monitoring systems employed in the fields of security and healthcare if the ... -
Progress in development of a new luminescence setup at the FinEstBeAMS beamline of the MAX IV laboratory
(Elsevier Ltd, 2019)FinEstBeAMS is a new materials science beamline at the 1.5 GeV storage ring of the MAX IV Laboratory in Lund, Sweden. It has been built based on grazing incidence monochromatization of synchrotron light, which allows to ... -
Prospects of Decarbonizing Industrial Areas in the Baltic States by Means of Alternative Fuels
(Polskie Towarzystwo Inzynierii Ekologicznej (PTIE), 2022)All three Baltic States have reached good fi gures regarding the change in total greenhouse gas emissions from transport during 1990-2017. Particularly successful is Lithuania, showing a negative value of -2.7%. Latvia ... -
Proton migration barriers in BaFeO3-δ – insights from DFT calculations
(Royal Society of Chemistry, 2023) -
Proton migration barriers in BaFeO3−δ – insights from DFT calculations
(Royal Society of Chemistry, 2023)Proton migration in the triple conducting perovskite BaFeO3−δ is investigated using first-principles density functional theory calculations. Oxygen-deficient BaFeO3−δ exhibits pronounced lattice distortions that entail ... -
Pulsed Electric Field: Fundamentals and Effects on the Structural and Techno-Functional Properties of Dairy and Plant Proteins
(MDPI, 2022)Dairy and plant-based proteins are widely utilized in various food applications. Several techniques have been employed to improve the techno-functional properties of these proteins. Among them, pulsed electric field (PEF) ... -
Pulsed Electric Fields Alter Expression of NF-κB Promoter-Controlled Gene
(MDPI, 2022)The possibility to artificially adjust and fine‐tune gene expression is one of the key mile-stones in bioengineering, synthetic biology, and advanced medicine. Since the effects of proteins or other transgene products ... -
Radiation-induced stable radicals in calcium phosphates: Results of multifrequency epr, ednmr, eseem, and endor studies
(Multidisciplinary Digital Publishing Institute (MDPI), 2021)This article presents the results of a study of radiation-induced defects in various synthetic calcium phosphate (CP) powder materials (hydroxyapatite—HA and octacalcium phosphate—OCP) by electron paramagnetic resonance ... -
Radioluminescence, thermoluminescence and dosimetric properties of ZnO ceramics
(Elsevier Ltd, 2017)Two types of ZnO ceramics were fabricated and characterized by XRD, SEM methods. The radioluminescence spectra were measured within the 300–550 K range. The defect luminescence band peaking at ~2.35 eV is the dominant one ... -
Raman spectral identification of phase distribution in anodic titanium dioxide coating
(Estonian Academy of Sciences, 2017)Growing need for cleaner environment and energy production has brought about a hunt for perspective materials. One of such perspective materials is titanium dioxide (TiO2, titania) due to its chemical stability and ... -
Re-Evaluation of Chromium Doped Alumina for Dosimetric Applications
(De Gruyter, 2021)Many medical examinations involve ionizing radiation. Although the range of available dosimeters is rather wide, their linearity and chemical stability are limited. Recently, there has been a growing interest in new, ...