PUBLICATIONS

Recent Publications

2025

• Akkaşoğlu, O., Karakaya, M., Novak, N., Fulanović, L., & Adem, U. (2025). Ferroelectric to relaxor crossover in Zr-doped BaTiO3-based ceramics and its consequences for the electrocaloric effect. Journal of Materials Chemistry C, 13(42), 21648-21655.

Here, we continue exploring the interesting properties of BT-rich BT-NBT solid solutions. B-site doping with Zr strongly tunes the properties.

• Umut Adem, Merve Karakaya, and Oğuz Akkaşoğlu, Electrocalorics: Materials and Physical Mechanisms, Book chapter in Advanced Smart and Multifunctional Materials Volume 1: Fundamentals and Types. , 137-166
  DOI:10.1021/bk-2025-1513.ch006

2024

• Karakaya, M., Gürbüz, İ., Fulanović, L., & Adem, U. (2024). Stabilization of the first-order phase transition character and enhancement of the electrocaloric effect by Na0.5Bi0.5TiO3 substitution in BaTiO3 ceramics. Journal of Materials Chemistry C, 12(48), 19612-19619.

We show that the increase in tetragonality with NBT substitution helps to maintain the first-order nature of the phase transition in BaTiO₃ and correspondingly large electrocaloric response, despite the simultaneous  enhancement of relaxor ferroelectric character with the NBT substitution. 

Figure: Comparison of the phase transition behavior of BT–NBT samples. (a) DSC measurements on heating and cooling, (b) dielectric measurements of heating and cooling at 10 kHz, and (c) temperature dependence of remanent polarization. In the insets of the figures in (c), P(E) loops at temperatures close to the Curie temperatures of the respective compositions are shown. 

 

• Sakar, Neslihan, Aylin Ziylan Albayrak, Merve Karakaya, Umut Adem, and Tunay Tansel. “Novel injectable calcium-magnesium phosphate cement-based composites with piezoelectric properties: advancements in bone regeneration applications.” Journal of Materials Science: Materials in Electronics 35, no. 15 (2024): 1023.

 

• Ünal, Muhammet Ali, Merve Karakaya, Tuğçe Irmak, Gökçe Yıldırım-Özarslan, A. Murat Avcı, Lovro Fulanovic, Ender Suvacı, and Umut Adem. “Electrocaloric behaviour of tape cast and grain oriented NBT-KBT ceramics.” Journal of the European Ceramic Society 44, no. 4 (2024): 2128-2134.

 

• Karacasulu, Levent, Merve Karakaya, Umut Adem, Vincenzo M. Sglavo, Mattia Biesuz, and Cekdar Vakifahmetoglu. “Fast-firing of potassium sodium niobate (KNN).” Open Ceramics (2024): 100541.

2023

• Karakaya, Merve, Emre Erdem, Yasar Akdogan, and Umut Adem. “Effects of different precursors on the aging and electrocaloric properties of Mn-doped Ba0. 95Sr0. 05TiO3 ceramics.” Journal of Materials Science: Materials in Electronics 34, no. 27 (2023): 1871.

 

• Coban Tetik, Hatice Sule, Ender Suvaci, A. Murat Avci, Umut Adem, and Merve Karakaya. “Development of textured lead-free NBT-based piezoelectric materials in a matrix, synthesized by an alternative route, via templated grain growth.” Journal of Materials Science: Materials in Electronics 34, no. 4 (2023): 324.

 

• Tokkan, Melike, Mustafa M. Demir, and Umut Adem. “Enhanced electrocaloric effect of P (VDF-TrFE)-based nanocomposites with Ca and Sn co-doped BaTiO3 particles.” Ceramics International 49.2 (2023): 2904-2910.

2021

• M. Karakaya, U. Adem, Enhanced room temperature energy storage density of Bi(Li_1/3Ti_2/3)O₃ substituted Bi_0.5Na_0.5TiO₃–BaTiO₃ ceramics, Journal of Physics D: Applied Physics,  54, 275501, (2021).

2020

• Yifeng Han, Meixia Wu, Churen Gui, Chuanhui Zhu, Zhongxiong Sun, Mei-Huan Zhao, Aleksandra A. Savina, Artem M. Abakumov, Biao Wang, Feng Huang, LunHua He, Jie Chen, Qingzhen Huang, Mark Croft, Steven Ehrlich, Syed Khalid, Zheng Deng, Changqing Jin, Christoph P. Grams, Joachim Hemberger, Xueyun Wang, Jiawang Hong, Umut Adem, Meng Ye, Shuai Dong & Man-Rong Li, Data-driven computational prediction and experimental realization of exotic perovskite-related polar magnets, NPJ Quantum Materials, 5, 92, (2020).

 

• A. Kurnia, Emriadi, Nandang Mufti, Zulhadjri, U. Adem, Electrocaloric effect of alkali co-substituted Sr0.6Ba0.4Nb2O6 ceramics, Journal of Alloys and Compounds, 844, 156132, (2020).

 

• L. Karacasulu, M. Tokkan, M. Bortolotti, G. Ischia, U. Adem, C. Vakifahmetoglu, Electrical characteristics of low temperature densified barium titanate, Ceramics International, 46, 16670-16676, (2020).

 

• Keriman Şanlı  and Umut Adem. “Electrocaloric properties of Ba0. 8Sr0. 2Ti1-xZrxO3 (0≤ x≤ 0.1) system: The balance between the nature of the phase transition and phase coexistence.” Ceramics International 46 (2020) (2), 2213-2219.

2019

• Ç. Meric Güvenç, and Umut Adem. “Influence of aging on electrocaloric effect in Li+ doped BaTiO3 ceramics.” Journal of Alloys and Compounds 791 (2019): 674-680.

 

• He-Ping Su, Shu-Fang Li , Yifeng Han, Mei-Xia Wu , Churen Gui , Yanfen Chang , Mark Croft , Steven Ehrlich , Syed Khalid , Umut Adem , Shuai Dong , Young Sun , Feng Huang  and Man-Rong Li  “Predicted polymorph manipulation in an exotic double perovskite oxide.” Journal of Materials Chemistry C 7.39 (2019): 12306-12311.

2016

• A.J.C.Buurma, G.R.Blake, T.T.M.Palstra, U.Adem, Multiferroic Materials: Physics and Properties, Chapter written for Reference Module in Materials Science and Materials Engineering, Elsevier, 2016

All publications

https://scholar.google.com.tr/citations?user=cQdz5bkAAAAJ&hl=tr