Number of investigations of ferroelectric perovskite compounds has been increasing as these materials are involved in fabrication of many electronic devices. One of the promising material is a composite of a Na0.5Bi0.5TiO3 and SrTiO3 due to its pronounced ferroelectric properties. In the study pre-synthesized Na0.5Bi0.5TiO3 and SrTiO3 powders were mixed and subsequently sintered. For dense samples electrical properties were measured. We observed that even after short sintering time of one hour these two materials reacted with each other extensively and formed various solid solutions. The ratio between the components effected final composition of the composite and electrical properties significantly. The results were compared with the measurements that were previously carried out on samples produced by solid state synthesis.
D.10 Educational activities
COBISS.SI-ID: 36231173In our work, pulsed laser deposition has been used to grow SrTiO3 on (100) silicon. Prior to deposition native oxide was removed from the surface of the silicon substrate using HF treatment. The results show that the optimal conditions for the direct growth of SrTiO3 on silicon involve a two-step procedure, in which the initial vacuum and the lower deposition temperature have an important role. The obtained films are textured with (100) orientation. Improved growth characteristics were observed in the case when SrO was used as a buffer layer. In this case the SrTiO3 film is epitaxial with STO(110)//Si(100) and STO[100]//Si[110]. In addition, X-ray photoemission spectroscopy of the film shows that the SrO and Sr2SiO4 layers are formed at the interface, which influence the growth direction of the SrTiO3 layer considerably.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 25948199In the present study we investigated the synthesis and structural characteristics of the Na0.5Bi0.5TiO3–KTaO3 ceramic system. The solid-state reactions were followed using X-ray powder diffraction, scanning electron microscopy and thermal analysis, which is mainly due to the presence of volatile elements. We observed that the solid solution exists across the whole concentration range, while numerous firings are required to attain a sufficient level of homogeneity. Meanwhile, considerable weight losses were detected, which can be compensated only by a surplus of selected elements, mainly Bi2O3. We determined that the homogeneity in the Na0.5Bi0.5TiO3–KTaO3 ceramic system has a significant effect on the dielectric properties.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 25924903