Stability and mechanical properties of {AxA′(1-x)}{ByB′(1-y)}O3 ceramics
TMS Middle East - Mediterranean Materials Congress on Energy and Infrastructure Systems, MEMA 2015, Doha, Qatar, 11 - 14 Ocak 2015, ss.423-432, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.1002/9781119090427.ch45
- Basıldığı Şehir: Doha
- Basıldığı Ülke: Qatar
- Sayfa Sayıları: ss.423-432
- Anahtar Kelimeler: First-principle calculations, Elastic constants, BaTiO3 crystals
- Kırklareli Üniversitesi Adresli: Evet
Özet
ABO3 ceramics and their alloys form the basis of piezoelectricity based energy harvesting, actuators and electromechanical sensing for material health monitoring. Enhancing their electromechanical response is crucial for these technological applications. In this study we investigate the phase stability, anisotropic mechanical properties of various {AxA′(1-x)}{ByB′(1-y)}O3 alloys using ab-initio density functional theory methods. The effects of composition, order on structure, energetics, elastic stiffness tensors are systematically investigated within the generalized-gradient approximation for A, A′=Ba, Sr, Pb, K, Ag; B, B′=Ti, Zr, Nb using super cells with 2×2×2 unit cells, unite cubic phase. In the present work, we have used Linear Response Theory as well as homogeneous field methods to provide an assessment of the performance of these methods for determination of properties.