Piezoelectrics are a category of useful supplies which were extensively used for software in trendy electro-mechanical and mechatronics applied sciences. *
The signal of longitudinal piezoelectric coefficients is usually constructive however not too long ago a couple of ferroelectrics, resembling ferroelectric polymer poly(vinylidene fluoride) and van der Waals ferroelectric CuInP2S6, had been experimentally discovered to have destructive piezoelectricity.
Within the article “Tunable and parabolic piezoelectricity in hafnia below epitaxial pressure” Hao Cheng, Peijie Jiao, Jian Wang, Mingkai Qing, Yu Deng, Jun-Ming Liu, Laurent Bellaiche, Di Wu and Yurong Yang, utilizing first-principles calculation and measurements, present that the signal of the longitudinal linear piezoelectric coefficient of HfO2 will be tuned from constructive to destructive through epitaxial pressure. *
Nonlinear and even parabolic piezoelectric behaviors are additional discovered at tensile epitaxial pressure. *
This parabolic piezoelectric conduct implies that the polarization decreases when rising the magnitude of both compressive or tensile longitudinal pressure, or, equivalently, that the pressure will increase when rising the magnitude of electrical area being both parallel or antiparallel to the route of polarization. The bizarre piezoelectric results are from the chemical coordination of the energetic oxygen atoms. *
These placing piezoelectric options of constructive and destructive signal, in addition to linear and parabolical behaviors, develop the present information in piezoelectricity and broaden the potential of piezoelectric purposes in direction of electro-mechanical and communications expertise. *
NanoWorld Pt/Ir coated Pointprobe® EFM AFM probes had been used for the pattern characterization by switching spectroscopy PFM measurements.
Switching spectroscopy PFM measurements had been carried out on the naked HZO movie floor at room temperature with Nanoworld Pointprobe® EFM in a commercially accessible atomic power microscope, whereas the LSMO electrode was grounded.
![Fig. 5 from Hao Cheng et al. (2024) “Tunable and parabolic piezoelectricity in hafnia under epitaxial strain”: [111]-oriented HZO films grown on (110) LAO substrates with different thicknesses of LSMO buffer layers.a XRD θ-2θ patterns of HZO films deposited on (110)-oriented LAO with 20-, 33-, 66-nm-thick LSMO buffer layers. b PFM phase loops of the HZO films deposited on 20-, 33- and 66-nm-thick LSMO buffered LAO substrates. c–e Reciprocal space mappings around the (310) spot of HZO/LSMO/LAO with c 20-, d 33-, and e 66-nm-thick LSMO buffer layers. NanoWorld Pt/Ir coated Pointprobe® EFM AFM probes the sample characterization by switching spectroscopy PFM measurements.](https://www.nanoworld.com/blog/wp-content/uploads/2025/05/Fig-5-from-Hao-Cheng-et-al-2024-Tunable-and-parabolic-piezoelectricity-in-hafnia-under-epitaxial-strain-NanoWorld-EFM-AFM-probe-blog.jpg)
a XRD θ-2θ patterns of HZO movies deposited on (110)-oriented LAO with 20-, 33-, 66-nm-thick LSMO buffer layers. b PFM section loops of the HZO movies deposited on 20-, 33- and 66-nm-thick LSMO buffered LAO substrates. c–e Reciprocal house mappings across the (310) spot of HZO/LSMO/LAO with c 20-, d 33-, and e 66-nm-thick LSMO buffer layers.
*Hao Cheng, Peijie Jiao, Jian Wang, Mingkai Qing, Yu Deng, Jun-Ming Liu, Laurent Bellaiche, Di Wu and Yurong Yang
Tunable and parabolic piezoelectricity in hafnia below epitaxial pressure
Nature Communications quantity 15, Article quantity: 394 (2024)
DOI: https://doi.org/10.1038/s41467-023-44207-w
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