Article
Materials Science, Multidisciplinary
Elena Buixaderas, Cosme Milesi-Brault, Premysl Vanek, Jan Kroupa, Floriana Craciun, Francesco Cordero, Carmen Galassi
Summary: The coexistence of multiple structural instabilities in Zr-rich Pb(Zr,Ti)O3 allows for the sequential condensation of these instabilities, triggering a series of phase transitions instead of directly reaching the AFE phase. This behavior is particularly prominent in compositions near the antiferroelectric morphotropic phase boundary and the tricritical point around room temperature, such as PZT 95/5, where three phases are energetically available. Experimental results on PZT 96/4 and 95/5 ceramics revealed a complex and hysteretic thermal behavior due to the complex microstructure and coexistence of different phases within the samples. Based on the observed thermal behavior of the intermediate polar states, ceramics with compositions near PZT 95/5 show potential for novel room temperature device applications, and a new phase-control approach is proposed using small temperature gradients and appropriate heating-cooling cycles.
Article
Materials Science, Multidisciplinary
Chaorui Qiu, Zhuo Xu, Zheyi An, Jinfeng Liu, Guanjie Zhang, Shujun Zhang, Long-Qing Chen, Nan Zhang, Fei Li
Summary: Alternating current (AC) electric field poling has been actively studied to tailor the domain configuration of relaxor ferroelectric crystals, but there is still no consensus on the mechanism of the change and redistribution of ferroelectric domains under AC electric field. This study using three-dimensional synchrotron X-ray diffraction reveals that AC electric field can efficiently merge ferroelectric domains, leading to increased domain size and electromechanical properties. The most stable state for AC-poling rhombohedral PMN-PT crystals is expected to be the lamellar domain structure with specific characteristics.
Article
Engineering, Electrical & Electronic
Abhipshit Kumar, Sujoy Saha, Hariom Prakash, Bhoopesh Mahale, Ram Prakash Singh, Anil Adukkadan, Rajeev Ranjan, Naveen Kumar
Summary: In this study, the influence of high temperature processing environment on the electromechanical response of a high-performance piezoelectric system (PMNPZT) was investigated. It was found that the environment which generates more defects significantly improves both the weak signal and large signal electromechanical response of the system.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Sang Hyo Kweon, Eun-Ji Kim, Goon Tan, Isaku Kanno
Summary: In this study, piezoelectric energy harvesters (PEHs) based on epitaxial PZT thin films with varied Zr/[Zr+Ti] ratio were fabricated. The PZT/Si films showed a broader morphotropic phase boundary (MPB) range compared to bulk PZT. The effective piezoelectric coefficients (|e(31,f)|) were evaluated for different MPB compositions, and the results showed that the MPB-R composition had the highest direct |e(31,f)|, while the MPB-T composition had the highest converse |e(31,f)|. The MPB-T composition also exhibited a high output power density under specific conditions, making it highly promising for high-performance PEH applications.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Physics, Applied
Akari Kanagawa, Yasuhiro Fujii, Kenji Ohwada, Yukikuni Akishige, Shinya Tsukada
Summary: The study investigated morphotropic phase boundaries (MPBs) in relaxor Pb(Zn1/3Nb2/3)O-3-ferroelectric PbTiO3 systems using angle-resolved polarized Raman spectroscopy at 800 K. By utilizing the multivariate curve resolution (MCR) method, spectral features were accurately extracted and anomalies at x = 0.07 near the MPB were observed. This demonstrates the potential of Raman spectroscopy to extract information related to MPBs even in a simple high-temperature paraelectric phase.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Composites
Shogo Mamada, Tatsuya Ohta, Masafumi Yamato
Summary: Aligned-type piezoelectric rubber combines the piezoelectricity of PZT with the elasticity of silicone rubber, resulting in higher piezoelectric performance and lower Young's modulus compared to PVDF and CAT.
PLASTICS RUBBER AND COMPOSITES
(2021)
Article
Physics, Applied
F. Cordero
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Chemistry, Physical
Francesco Cordero, Floriana Craciun, Francesco Trequattrini, Patrizia Imperatori, Anna Maria Paoletti, Giovanna Pennesi
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
Article
Materials Science, Multidisciplinary
Francesco Cordero
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2018)
Article
Materials Science, Ceramics
F. Craciun, F. Cordero, M. Cernea, V. Fruth, I. Atkinson, N. Stanica, B. S. Vasile, R. Trusca, A. Iuga, P. Galizia, C. Galassi
CERAMICS INTERNATIONAL
(2019)
Article
Chemistry, Physical
Francesco Cordero, Elena Buixaderas, Carmen Galassi
Article
Chemistry, Physical
Francesco Cordero, Floriana Craciun, Francesco Trequattrini, Amanda Generosi, Barbara Paci, Anna Maria Paoletti, Giovanna Pennesi
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2019)
Article
Physics, Applied
David Chapron, Francesco Cordero, Marc D. Fontana
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Physical
Francesco Cordero, Floriana Craciun, Francesco Trequattrini, Amanda Generosi, Barbara Paci, Anna Maria Paoletti, Gloria Zanotti
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Francesco Cordero, Floriana Craciun, Anna Maria Paoletti, Gloria Zanotti
Summary: The study analyzed the influence of water on the structural stability and transformations of MAPI and FAPI through spectroscopic techniques, revealing that interstitial water can affect the phase transitions in the perovskite materials.
Article
Crystallography
Francesco Cordero, Floriana Craciun, Francesco Trequattrini, Simona Ionita, Daniel Lincu, Raul-Augustin Mitran, Victor Fruth, Simona Brajnicov, Antoniu Moldovan, Maria Dinescu
Summary: We investigated the dielectric and anelastic spectra of molecular piezoelectric materials TMCM-MnCl3 and TMCM-Mn0.95M0.05Cl3. The dielectric permittivity decreases at the structural transition temperature, indicating the formation of ferroelectric domains. Elastic anomalies also occur, showing the improper character of the ferroelectric transition. Thermally activated relaxation processes are observed below room temperature, attributed to point defects such as Cl vacancies and their complexes with TMCM vacancies. Cu and Fe substitutions enhance the losses attributed to domain wall relaxation. Water condensation in the powders compacted by cold pressing is observed. The piezoelectric activity of the films is assessed by PFM.
Article
Engineering, Multidisciplinary
Floriana Craciun, Francesco Cordero, Elisa Mercadelli, Nikola Ilic, Carmen Galassi, Carlo Baldisserri, Jelena Bobic, Paola Stagnaro, Giovanna Canu, Maria Teresa Buscaglia, Adis Dzunuzovic, Mirjana Vijatovic Petrovic
Summary: Ultrasound energy harvesting has emerged as a promising technique for wireless power supply of implanted medical devices. This study reports on bio-compatible NBT-BT/PVDF flexible composites with high piezoelectric response in the ultrasonic range. The results show that these composites have enhanced high frequency piezoelectric response and high energy density harvested from an ultrasound source.
COMPOSITES PART B-ENGINEERING
(2023)
Correction
Materials Science, Multidisciplinary
F. Cordero, F. Trequattrini, F. Craciun, C. Galassi
Correction
Materials Science, Multidisciplinary
F. Cordero, F. Craciun, F. Trequattrini, C. Galassi, P. A. Thomas, D. S. Keeble, A. M. Glazer
Article
Physics, Multidisciplinary
Francesco Cordero, Francesco Trequattrini, Paulo Sergio da Silva Jr, Michel Venet, Oktay Aktas, Ekhard K. H. Salje
Summary: Elastic softening in Ba1-xSrxTiO3 paraelectric phases is most pronounced near the transition temperatures and gradually decreases during heating, extending to the highest measured temperature for Ba-rich compounds. The excess compliance of the precursor softening follows a power law relationship with temperature, with different characteristic exponents ranging from 1.5 in SrTiO3 to 0.2 in BaTiO3. The softening is described by extremely low Vogel-Fulcher energies, indicating a change from a displacive to a weakly order-disorder character of the elastic precursor. The high-temperature elastic properties of these materials are significantly affected by precursor softening, as the elastic softening remains at about 33% of the unsoftened Young's modulus even at temperatures as high as 750 K in BaTiO3.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
F. Cordero, F. Trequattrini, F. Craciun, H. T. Langhammer, D. A. B. Quiroga, P. S. Silva