News

 

In my Ph.D. thesis, I fabricated highly-dense polycrystalline bulk ceria compounds (Ce1-xMxO2-δ) varying dopant type/concentration by different thermal treatments, including field-assisted sintering, cold sintering process, and conventional free sintering for room temperature electromechanical applications. Such approaches develop different microstructure with modified defect configurations at the ion-blocking barriers. Electrochemical, mechanical, microstructural, and electromechanical characterization were performed on the samples. It was found that M33 demonstrates strain saturation and non-Debye frequency relaxation depending on the extent of dopant-defect electro-steric interaction. Remarkably, neither grain size nor bulk conductivity dominated effect is observed. 

 

My current research which proceeds since October 2020 within the DFG funded research unit “periodic low-dimensional defect structures in polar oxides” is to investigate the correlation of point defects, domain structure, charge transport, and electromechanical properties of the model system lithium niobite-tantalate (LiNb1-xTaxO3, LNT). The objective of this work is to enhance the electromechanical quality factor of resonant devices, temperature range, long-term stability in harsh operating conditions as well as to develop a device for contactless measurement for acoustic losses.

 

Figure: Atomistic mechanism of non-classical electrostriction in ceria 

Dr. Ahsanul Kabir
Technical University of Clausthal
Institute of Energy Research and Physical Technologies
38640 Goslar, Germany
Email: ahsanul.kabir@tu-clausthal.de
Researchgate: https://www.researchgate.net/profile/Ahsanul_Kabir6