A Piezoresponse Force Microscopy Study of CaxBa1−xNb2O6 Single Crystals

Shvartsman, Vladimir V.; Gobeljic, Danka; Dec, J.

doi:10.3390/ma10091032

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…Compared to the SBN solid solution, CBN should be similar to SBN-35. Yet, CBN has much smaller domains [38,39] and shows higher level of disorder than SBN-35. The relaxor behaviour in SBN for higher Sr compositions is partially caused by the random occupation of the pentagonal channels, and the size of the ferroelectric domain decreases with increasing Sr content, along with the relaxor behaviour [40] .…”

Section: Discussionmentioning

confidence: 95%

Phonons and relaxations in unfilled tetragonal tungsten-bronzes

Buixaderas

Dec

2021

Mat & Dev

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The lead-free unfilled tetragonal tungsten-bronzes SBN and CBN are investigated by Raman, infrared and high-frequency dielectric spectroscopies. The substitution in the different channels affects phonons as well as relaxations. Relaxations in SBN show similar qualitative behaviour on increasing Sr content and relaxor behaviour, but for the extreme relaxor samples all characteristic frequencies are higher with stronger contribution to the permittivity in the GHz-THz range is stronger. The presence of a soft anharmonic central mode in the THz range together with the slowing down of a relaxation from GHz to MHz ranges reveals the coexistence of displacive and order-disorder scenarios for the ferroelectric phase transition in this family.

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Section: Discussionmentioning

confidence: 95%

Phonons and relaxations in unfilled tetragonal tungsten-bronzes

Buixaderas

Dec

2021

Mat & Dev

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“…There, the single-crystal nature was proven and a refined quantitative analysis of different structural and compositional parameters could be established. As an additional integrity test of the two samples of the present study, the ferroelectric domain properties of the z-cut crystal plate were checked by piezoresponse force microscopy (PFM), revealing the typical fractal-like nanodomain pattern known from the literature [5,29], see Figure S2. Furthermore, extended domains written by an atomic-force-microscope tip were imaged via Cherenkov second-harmonic-generation microscopy (CSHG) to observe the vanishing of the domain contrast upon heating (Figure S3).…”

Section: Crystal Growthmentioning

confidence: 99%

Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals

et al. 2021

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In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner.

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Investigation on degree of non-ergodicity and local piezoelectric properties in Na0.5Bi0.5TiO3–BiFeO3–PbTiO3 system

Kuruvila,

Shvartsman,

Hotari

et al. 2023

Journal of Applied Physics

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Knowledge of the statics and dynamics of ferroelectric domains is of immense importance since they are directly correlated with macroscopic polarization and strain. For the present work, piezoresponse force microscopy (PFM) is used to afford insight into field-induced phase transitions and local switching properties of a (1–2x)Na0.5Bi0.5TiO3–xBiFeO3–xPbTiO3 system for compositions, x = 0.01, 0.03, 0.05, and 0.07. Rietveld analysis of x-ray diffraction data reveals crystallization of the compound in single and dual phases in the chosen compositions. Upon the application of a local electric field, a phase transition from relaxor to normal ferroelectric (FE) is observed for all samples. A decrease in degree of non-ergodicity is realized within this composition range, which is found by analyzing the stability of field-induced ferroelectric domains. The field-induced FE domains for lower concentrations of x are found to be irreversible and a reversible nature was found for higher values of x. In addition, spatial variations of local switching parameters are investigated with the help of switching spectroscopic-PFM and a maximum local d33 was found for compositions having dual phases.

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A Piezoresponse Force Microscopy Study of CaxBa1−xNb2O6 Single Crystals

Cited by 4 publications

References 20 publications

Phonons and relaxations in unfilled tetragonal tungsten-bronzes

Phonons and relaxations in unfilled tetragonal tungsten-bronzes

Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals

Investigation on degree of non-ergodicity and local piezoelectric properties in Na0.5Bi0.5TiO3–BiFeO3–PbTiO3 system

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