47 documents found, page 1 of 5
Perovskite-inspired low-dimensional hybrid azetidinium bismuth halides: [(CH2)3...
Jin, Young Un; Marler, Bernd; Salak, Andrei N.; Escobar-Castillo, Marianela; Benson, Niels; Lupascu, Doru C.Bi-based halide perovskites have been considered as alternatives to Pb-based perovskites with the intention of avoiding the use of lead in the field of photovoltaics. Over the last few years, novel Bi-based halide perovskites have shown potential in reaching good photovoltaic performance, as suggested by their similar electronic structure to Pb-based perovskites. Nevertheless, their lower dimensionality entails...
Weakly-coupled barium titanate stannate-based relaxors as energy storage materials
Kröll, Eva; Devecioglu, Lara; Salak, Andrei N.; Piotrowsky, Lukas; Shvartsman, Vladimir V.; Lupascu, Doru C.Lead-free relaxor ferroelectrics are promising materials for energy storage applications. To find new material systems for electrostatic capacitors, many researches have dedicated their work to formulate new ecologically safe compositions. In our study, we have prepared (1−x)Ba(Ti0.93Sn0.07)O3−xBiYO3 (BTS7-BY) solid solutions via the solid-state method. The parent composition, Ba(Ti0.93Sn0.07)O3 is a ferroelect...
Commercial synthetic hydrotalcite as an adsorbent nanomaterial for removal of b...
Sidarenka, Anastasiya V.; Leanovich, Sviatlana I.; Kalamiyets, Emiliya I.; Vieira, Daniel E. L.; Cardoso, João P. V.; Tedim, João; Salak, Andrei N.Layered double hydroxides (LDHs) are regarded as potential adsorbents for water treatment from a wide range of pollutants. However, there are only a few studies concerning application of LDHs for elimination of microorganisms from aquatic systems. In this work, experiments were conducted to investigate the efficiency of commercial synthetic hydrotalcite Mg6Al2(CO3)(OH)16∙4H2O as an adsorbent for water purificat...
Brushite mineralised Scots pine (Pinus sylvestris L.) sapwood: revealing minera...
Garskaite, Edita; Balciunas, Giedrius; Drienovsky, Marian; Sokol, Denis; Sandberg, Dick; Bastos, Alexandre C.; Salak, Andrei N.Dicalcium phosphate dihydrate (CaHPO4$2H2O, DCPD, brushite) crystals were synthesised within Scots pine sapwood via a wet-chemistry route from aqueous solutions of Ca(CH3COO)2 and NH4H2PO4 salts. SEM/EDS analysis was used to assess the saturation of the wood cell lumina and cell wall as well as morphological features and elemental composition of the co-precipitated mineral. Brushite mineral crystallization and ...
Dissolution–precipitation synthesis and thermal stability of magnesium whitlockite
Kizalaite, Agne; Klimavicius, Vytautas; Balevicius, Vytautas; Niaura, Gediminas; Salak, Andrei N.; Yang, Jen-Chang; Cho, Sung Hun; Goto, TomoyoMagnesium whitlockite (Mg-WH, Ca18Mg2(HPO4)2(PO4)12) is a promising candidate for biomedical application in bone regeneration; however, the fabrication of Mg-WH bioceramics by conventional methods is limited. Mg-WH is known to be thermally unstable and decomposes upon heating. The mechanism of thermal decomposition and phase evolution has not comprehensively been investigated so far. In the present work, Mg-WH ...
Lead-free organic–inorganic azetidinium alternating metal cation bromide: [(CH₂...
Jin, Young Un; Marler, Bernd; Karabanov, Andrei D.; Winkler, Kristina; Yap, Ian Chang Jie; Dubey, Astita; Spee, Leon; Escobar Castillo, MarianelaIn the last decade, organic–inorganic hybrid halide perovskite materials have developed into a very large research area in photovoltaics and optoelectronics as promising light harvesters. Lead-free double perovskites have recently been investigated as an environmentally friendly alternative to the leadcontaining compositions. However, lead-free organic–inorganic hybrid halide double perovskites have so far rare...
The orthorhombic-tetragonal morphotropic phase boundary in high-pressure synthe...
Salak, Andrei N.; Shvartsman, Vladimir V.; Cardoso, João Pedro; Pushkarev, Anatoli V.; Radyush, Yury V.; Olekhnovich, Nikolai M.; Khalyavin, Dmitry D.(1–x)BiMg0.5Ti0.5O3− xBiZn0.5Ti0.5O3 [(1− x)BMT–xBZT] ceramics of perovskite solid solutions, in which BMT and BZT are lead-free structural analogs of PbZrO3 and PbTiO3, respectively, have been synthesized under high pressure. It was found that the as-prepared compositions with a relative BZT content of <75 mol% are orthorhombic (space group Pnnm), while those with a BZT content above this value are tetragonal ...
Ce-substituted Mg-Al layered double hydroxides to prolong the corrosion protect...
Vieira, Daniel E. L.; Salak, Andrei N.; Ferreira, Mário G. S.; Vieira, Joaquim M.; Brett, Christopher M. A.Layered double hydroxides (LDH) have emerged as an alternative to chromates for corrosion protection by exploiting anion-exchange phenomena: the LDH releases corrosion inhibitor anions and captures the corrosive agent anions, extending the metal surface lifetime. In this work, the main aim was to promote continuation of corrosion protection after the end of the process of anion-exchange. For this purpose, ceriu...
Dielectric and infrared spectroscopy characterization of Co–Al layered double h...
Zamaraite, Ilona; Vieira, Daniel E. L.; Vieira, L. G.; Ribeiro, J. L.; Vieira, Joaquim M.; Salak, Andrei N.; Banys, JūrasLayered double hydroxides (LDHs) are natural 2D materials with promising functionalities. A comprehensive understanding of physical properties (such as electrical or optical) is critical for their current and future applications. Herein, dielectric and infrared spectroscopy to extensively characterize thermal behavior of dynamic effects in cobalt–aluminum LDH with Co-to-Al ratio of 2 and intercalated with nitra...
Interplay of magnetic properties and doping in epitaxial films of h-REFeO3 mult...
Baghizadeh, Ali; Vaghefi, Pegah Mirzadeh; Huang, Xing; Borme, Jerome; Almeida, B. G.; Salak, Andrei N.; Willinger, Marc-Georg; Amaral, Vitor B.Multiferroic materials demonstrating coexistence of magnetic and ferroelectric orders are promising candidates for magnetoelectric devices. While understanding the underlying mechanism of interplaying of ferroic properties is important, tailoring their properties to make them potential candidates for magnetoelectric devices is challenging. Here, the antiferromagnetic Neel ordering temperature above 200 K is rea...