Оксидні матеріали електронної техніки – отримання, властивості, застосування.
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Item Concentration and temperature-driven phase transitions in the NdAlO3-EuAlO3 system(Видавництво Львівської політехніки, 2012) Ohon, N.; Pashuk, A.; Hoffmann, S.; Vasylechko, L.Phase and structural behaviour in the NdAlO3– EuAlO3 system has been studied in a whole concentration range. Depending on x two kinds of solid solutions Nd1-xEuxAlO3 one with rhombohedral (x £ 0.15) and one with orthorhombic (x ³ 0.25) symmetry exist at room temperature. A morphotropic phase transition occurs at x ≈ 0.20, where the co-existence of both phases was observed. First-order structural phase transition Pbnm↔R 3 c has been detected in Nd0.6Eu0.4AlO3 at 627 K both from in situ high-temperature X-ray synchrotron powder diffraction and thermal analysis data.Item Concentration and temperature-driven phase transitions in the NdAlO3-EuAlO3 system(Видавництво Львівської політехніки, 2012) Ohon, N.; Pashuk, A.; Hoffmann, S.; Vasylechko, L.Phase and structural behaviour in the NdAlO3– EuAlO3 system has been studied in a whole concentration range. Depending on x two kinds of solid solutions Nd1-xEuxAlO3 one with rhombohedral (x £ 0.15) and one with orthorhombic (x ³ 0.25) symmetry exist at room temperature. A morphotropic phase transition occurs at x ≈ 0.20, where the co-existence of both phases was observed. First-order structural phase transition Pbnm↔R 3 c has been detected in Nd0.6Eu0.4AlO3 at 627 K both from in situ high-temperature X-ray synchrotron powder diffraction and thermal analysis data.Item Synthesis and structural relationship of complex tantalum phosphates in the flux system K2O–P2O5–Ta2O5–MoO3(Видавництво Львівської політехніки, 2012) Babaryk, A. A.; Odynets, I. V.; Baumer, V. N.; Slobodyanik, N. S.; Khainakov, S.; Hoffmann, S.Single crystals of K2Ta4O11 (I), K(TaO2)2PO4 (II) and K3Ta5O11(PO4)2 (III) were synthesized by flux-aided method in the pseudo-quaternary system K2O–P2O5–Ta2O5–MoO3. Tight interrelation of their crystal structures has been found via X-ray diffraction study. Experimental solid-state band gap measurements revealed its semiconductor nature corroborated with DFT calculations. Local structure of PO4 groups in (II) and (III) compounds was probed with 31P MAS NMR spectroscopy.Item New cobaltites and chromites with a distorted K2NiF4 type of structure(Видавництво національного університету „Львівська політехніка”, 2009) Vasylechko, L.; Fedorchuk, A.; Trots, D.; Prots, Yu.; Schmidt, M.; Hoffmann, S.