- Acronym: EntroPer
- Project Code: PN-III-P1-1.1-PD-2021-0625
- Contract Number: 22PD
- Start: 01/04/2022
- Duration: 24 months
- Budget: 249.996,00 Lei
- Contracting Agency:: Executive Agency for Higher Education, Research, Development and Innovation Funding
- Coordinating Institution: : University POLITEHNICA of Bucharest – National Research Center for Micro and Nanomaterials
Address: Spl. Independentei 313, Sector 6, Bucharest, Romania
Project manager: Lect. Dr. Eng. Vasile-Adrian SURDU
Supervisor: Prof. Dr. Eng. Adelina Carmen IANCULESCU
The concrete objective of the project is to contribute to the fundamental understanding of the role of long-order and short-order interactions in the phenomenology of relaxor-ferroelectric behavior. This will be realized by inducing chemical disorder in oxide systems, by entropy-driven stabilization on A and/or B-site of ABO3 perovskite structure. The main objective is ambitious considering the complexity of the proposed compositions with 5 cations on an equivalent crystallographic site of ABO3 perovskite structure, and potential difficulties in preparing single-phase ceramics. The approach of the project is experimental and multidisciplinary and involves activities of powders preparation by wet-chemistry Pechini method, elaboration of ceramics by alternative sintering strategies (conventional sintering and Spark Plasma Sintering) and complex investigation of the composition, structure, microstructure as well as functional properties (relative permittivity, dielectric losses). The successful achievement of the objective may open a way to new design strategy and understanding of the chemical disorder influence and microstructural design on electrical behavior for perovskite oxide relaxors.
The estimated scientific results of the project are summarized in two points:
(i) Understanding of the chemical disorder contribution to functional properties of and domain wall formation in relaxors with high configurational entropy on A-site, B-site or both cationic sites of the perovskite structure. Result indicators such as permittivity, dielectric constant, dielectric loss values, ferroelectric domain walls characteristics will be assessed to relative to typical perovskite relaxors.
(ii) Understanding of the composition – structure – microstructure – functional properties relation in high entropy perovskites. The results indicators are the distortion of the perovskite structure for high entropy oxides, grain size, grain boundary density assessed relative to permittivity, dielectric constant and dielectric loss values.