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Feb 11, 2021

High performance electromechanically active materials by Ahsanul Kabir

YCN Research in Spot - February 2021

Electromechanically active materials i.e. materials change their shape in response to an electric field have a wide range of sensing and actuating applications from low to high temperatures.

The state-of-the-art material contains lead (Pb) which is highly toxic and restricted by the EU RoHS directive. Moreover, very recently, a new family of electromechanically active materials has been discovered: oxygen defective ceria. Such material displays a gigantic electromechanical response with an electrostriction strain coefficient (M33) ~10−16-10−18 m2/V2, following a non-classical behavior. The governing mechanism is attributed to the rearrangement of electroactive elastic dipoles (CeCe-Vo) that rearranges the bond length under an electric field. 
 
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

Last news

Jun 13, 2024
Next deadline for the JECS Trust mobility Grant is 31st August 2024!

Please note that the decisions of the JECS Trust board will not be known before Mid-October 2024 and so the project submitted must not begin before mid-November 2024.

Jun 10, 2024
2024 ECerS International Ceramist Student Exchange Program – 3rd call!

In the frame of the 2024 ECerS International Student exchange program, ECerS is opening a third call, this time to allow grants to European Students to attend the 2024 Fall meeting of Korean Ceramic Society (COEX) that will be organised by the Korean Ceramic Society in Seoul, Korea, from 16th to 18th October 2024.

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