Exploring foci of
2025-06-18
Compositionally graded Ba1−<i>x</i>Sr<i>x</i>TiO3 thin film for SIMS applications
2025-06-18 • J. Scola, J. García, François Jomard, Estelle Loire, J. Wolfman, B. Négulescu, Guozhen Liu, M.A. Pinault-Thaury
A heterostructure of Ba1−xSrxTiO3/La1.1Sr0.9NiO3/SrTiO3 has been analyzed by magnetic sector secondary ion mass spectrometry (SIMS). The stoichiometry parameter x of the top layer was made varying continuously from 0 to 1 along the width of the sample by combinatorial pulsed laser deposition. Prior to SIMS analysis, the composition gradient of Ba1−xSrxTiO3 was quantitatively characterized by chemical characterizations including wavelength and energy dispersive x-ray spectroscopies. Even if the Ti content is consta…
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2025-02-13
Evidence of the matrix effect on a compositionally graded oxide thin film
2025-02-13 • J. Scola, François Jomard, Estelle Loire, J. Wolfman, B. Négulescu, G. Z. Liu, M.A. Pinault-Thaury
A heterostructure of Ba$_{1-x}$Sr$_x$TiO$_3$/La$_{1.1}$Sr$_{0.9}$NiO$_3$ /SrTiO$_3$ has been analysed by magnetic sector secondary ion mass spectrometry (SIMS). The stoichiometry parameter $x$ of the top layer was made varying continuously from 0 to 1 along the width of the sample by combinatorial pulsed laser deposition. Prior to SIMS analysis, the composition gradient of Ba$_{1-x}$Sr$_x$TiO$_3$ was quantitatively characterized by chemical characterizations including wavelength and energy dispersive X-ray spectro…
Marangoni Effect
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2025-07-17
History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) -- 0.5 ( BaZr 0.2 Ti 0.8 O 3 )
2025-07-17 • Kevin Nadaud, Guillaume F. Nataf, Nazir Jaber, Edgar Chaslin, B. Négulescu, J. Wolfman
In this article, dielectric nonlinearities in 0.5(Ba0.7 Ca0.3 TiO3 ) -- 0.5(BaZr 0.2 Ti0.8 O3 ) thin film are studied using impedance spectroscopy and harmonic measurements, as a function of the AC measuring field, at different frequencies and upon cycling. The measurements reveal that the pinching of the hysteresis loop, characterized by a phase angle of the third harmonic close to --270 deg, is stronger for low frequencies. This confirms that the pinching is induced by the presence of polar nanoregions (PNRs), w…
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Exploring foci of
2024-01-22
Subcoercive field dielectric response of 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) thin film: Peculiar third harmonic signature of phase transitions and residual ferroelectricity
2024-01-22 • Kevin Nadaud, Guillaume F. Nataf, Nazir Jaber, Micka Bah, B. Négulescu, Pascal Andreazza, P. Birnal, J. Wolfman
Subcoercive field non-linearities in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) (BCTZ 50/50) thin film elaborated using pulsed laser deposition are studied using permittivity and phase angle of the third harmonic measurements as a function of the AC measuring field EAC and temperature. The global phase transition temperature Tmax for which the permittivity is maximum, decreases from 330 to 260 K when EAC increases. Rayleigh analysis of the AC field dependence of the relative permittivity shows a regular decrease in t…
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2024-09-08
SIMS analysis of an oxide thin film with continuous composition gradient
2024-09-08 • J. Scola, François Jomard, J. Wolfman, B. Négulescu, M.A. Pinault-Thaury
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