## Abstract

We suggest theoretical prediction for Ba_{c}Sr _{1-c}TiO_{3} perovskite solid solutions (BST) combining ab initio DFT/B3PW calculations and alloy thermodynamics. This approach is based on calculations of a series of ordered super-structures in Ba-Sr simple cubic sublattice immersed in the rest TiO_{3} matrix. Although these structures are unstable with respect to the decomposition, the results of total energy calculations allow us to extract the necessary energy parameters and to calculate the phase diagram for the solid solutions (alloys). A novel approach applied to the BST system enables to predict that at T > 400 K Ba and Sr atom distribution is random. But below this temperature at small c Ba atoms aggregate into nanoclusters, thus leading to the formation of Ba-rich complexes of "almost pure" BaTiO_{3} (BTO) in mostly SrTiO_{3} (STO) matrix. At large c the formation of analogous SrTiO_{3} complexes in BaTiO_{3} is predicted.

Original language | English |
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Pages (from-to) | 478-484 |

Number of pages | 7 |

Journal | Microelectronic Engineering |

Volume | 81 |

Issue number | 2-4 |

DOIs | |

State | Published - 1 Aug 2005 |

Event | The Proceedings of the 2nd International Symposium on Nano- and Giga-Challenges in Microelectronics - Duration: 12 Sep 2004 → 17 Sep 2004 |

## Keywords

- Ab initio thermodynamics
- BaSrTiO solid solutions
- Electronic structure calculations
- Hybrid density functional calculations

## ASJC Scopus subject areas

- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Electrical and Electronic Engineering

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