A. Pakalniskis A. Lukowiak, G. Niaura, P. Gluchowski, D. V. Karpinsky, D. O. Alikin, A. S. Abramov, A. Zhaludkevich, M. Silibin, A. L. Kholkin, R. Skaudzius, W. Strek, A. Kareiva
Single phase barium titanate-bismuth ferrite ((1-x)BaTi$_3$-(x)BiFe$_3$, BTO-BFO) solid solutions were prepared using citric acid and ethylene glycol assisted sol-gel synthesis method. Depending on the dopant content the samples are characterized by tetragonal, tetragonal-pseudocubic, pseudocubic and rhombohedral structure as confirmed by Raman spectroscopy and XRD measurements. An increase of the BFO content leads to a reduction in the cell parameters accompanied by a decrease in polar distortion of the unit cell wherein an average particle size increases from 60 up to 350 nm. Non zero piezoresponse was observed in the compounds with pseudocubic structure while no polar distortion was detected in their crystal structure using X-ray diffraction method. The origin of the observed non-negligible piezoresponse was discussed assuming a coexistence of nanoscale polar and non-polar phases attributed to the solid solutions with high BFO content. A coexistence of the nanoscale regions having polar and non-polar character is considered as a key factor to increase macroscopic piezoresponse in the related compounds due to increased mobility of the domain walls and phase boundaries.
Electrical Studies of Barkhausen Switching Noise in Ferroelectric lead zirconate titanate (PZT) and BaTiO3: Critical Exponents and Temperature-dependence
Hybrid Barium Titanate Waveguide Designs For Efficient Nonlinear Frequency Conversion
Fraunhofer Institute for Applied Optics and Precision Engineering IOF（弗劳恩霍夫应用光学和精密工程研究所）；Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena（耶拿弗里德里希·席勒大学阿贝光子学中心应用物理研究所）；Max Planck School of Photonics（马克斯·普朗克光子学校）
Theoretical investigation of electronic, optical and thermoelectric properties of tellurium doped barium titanate (BTO) through modified Becke Johnson exchange potential
Goldstone-mediated polar instability in hexagonal barium titanate
University of Warwick（华威大学）；Durham University（杜伦大学）；Luxembourg Institute of Science and Technology（卢森堡科学与技术研究所）；European Synchrotron Radiation Facility（欧洲同步辐射装置）；Institut Laue-Langevin（朗之万研究所）
Stabilization of highly polar BiFeO$_3$-like structure: a new interface design route for enhanced ferroelectricity in artificial perovskite superlattices
Electric Charge Transport and Dielectric Properties of the Barium Titanate Ceramics Obtained by Spark-Plasma Sintering with Different Carbon Content
Institute of Physics of the National Academy of Sciences of Ukraine（乌克兰国家科学院物理研究所）；Educational Scientific Institute of High Technologies, Taras Shevchenko National University of Kyiv（基辅塔拉斯舍甫琴科国立大学高等技术教育科学研究所）；Frantsevich Institute for Problems in Materials Science, National Academy of Sciences of Ukraine（乌克兰国家科学院弗兰采维奇材料科学问题研究所）；Department of Chemistry, Stockholm University（斯德哥尔摩大学化学系）；Department of Physical Materials Science and Heat Treatment, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”（乌克兰国立技术大学“伊戈尔·西科尔斯基基辅理工学院”物理材料科学与热处理系）
Possible ferrimagnetism and ferroelectricity of half-substituted rare-earth titanate: a first-principles study on Y$_{0.5}$La$_{0.5}$TiO$_3$
具有钙钛矿结构的钛酸盐，包括铁电体（例如，BaTiO $_3$）和铁磁材料（例如，YTiO（$_3$）是重要的功能材料。最近的理论研究预测了应变EuTiO $_3$和钛酸盐超晶格中的多铁性态，其中前者已经被实验证实。在这里，第一性原理计算进行调查Y半取代的LaTiO 3的结构，磁性和电子性质。我们的研究结果表明，由于固有的相竞争，Y $_{0.5}$ La $_{0.5}$ TiO $_3$的磁性敏感地依赖于其结构细节。最低能态是铁磁态，导致0.25 $μ_{\rm B}$ /Ti。此外，Y $_{0.5}$ La $_{0.5}$ TiO $_3$的某些构型表现出混合的非正常极化，这可以显著地受到磁性的影响，从而导致多铁性。由于取代的猝灭无序，具有随机A位离子的真正Y $_{0.5}$ La $_{0.5}$ TiO 3材料可能表现出有趣的弛豫行为。
Impact of Carbon Contamination on the Low-Temperature Electric Conduction of the Spark-Plasma Sintered Barium Titanate Ceramics
Institute of Physics of the National Academy of Sciences of Ukraine（乌克兰国家科学院物理研究所）；Frantsevich Institute for Problems in Materials Science, National Academy of Sciences of Ukraine（乌克兰国家科学院弗兰特谢维奇材料科学问题研究所）；V. Lashkarev Institute of Semiconductor Physics, National Academy of Sciences of Ukraine（乌克兰国家科学院瓦·拉舍列夫半导体物理研究所）
Role of the rare-earth doping on the multiferroic properties of BaTiO$_3$: First-principles calculation
采用从头算自旋极化密度泛函理论（AB-initio spin polarized Density Functional Theory plus U）研究了Eu（$^{3+}$）掺杂钛酸钡（Ba $_{1-x}$ Eu $_x$ O $_3$）体系的电子和磁性.在这项研究中，投影增强波（PAW）方法和Perdew-Zunger（LSDA）近似，这已被用于交换相关能，已被认为是考虑到一个超晶胞模型。在该模型中，自旋极化和Hubbard势被用来修正稀土离子部分填充f轨道中的电子-电子库仑相互作用。电子能带结构表明，随着掺杂浓度的增加，带隙能量和介电性能降低。另一方面，现代极化理论也表明，Ba $_{1-x}$ Eu $_x$ O $_3$体系的电极化的强度随铕含量的增加而增加，而态密度显示出铁磁特性（总磁化强度不为零）.磁性也显示强烈依赖于强局域Eu 4f-态在晶格中的交换相互作用。
