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• W2086375858 abstract "Perturbed angular correlation (PAC) spectroscopy was used to measure electric-field gradients (EFG's) at Ti sites in the tetragonally distorted perovskite ${mathrm{PbTiO}}_{3}$, which is ferroelectric, and in the orthorhombically distorted perovskite ${mathrm{CdTiO}}_{3}$, and the ilmenite ${mathrm{CdTiO}}_{3}$, which are not ferroelectric. The PAC probe $^{181}mathrm{Hf}$${/}^{181}$Ta was substituted into Ti sites in these phases at concentrations of approximately 1% of the Ti concentrations. Nuclear quadrupole interactions were measured from 77 to 730 K for the ${mathrm{PbTiO}}_{3}$ phase and from 77 to ensuremath{sim}1260 K for the ${mathrm{CdTiO}}_{3}$ phases. The perturbation functions for ${mathrm{PbTiO}}_{3}$ are characterized by high frequencies that show near-axial symmetry and that decrease rapidly at temperatures near the ferroelectric-to-paraelectric transition temperature ${mathit{T}}_{mathit{c}}$. Also, they are characterized by extensive line broadening that increases at temperatures near ${mathit{T}}_{mathit{c}}$.The perturbation functions for the perovskite ${mathrm{CdTiO}}_{3}$ are characterized by low frequencies that show much asymmetry ensuremath{eta}ensuremath{simeq}0.4 and by little line broadening, and the associated EFG decreases linearly with temperature. For the ilmenite ${mathrm{CdTiO}}_{3}$, the perturbation functions are characterized by moderate frequencies that show near-axial symmetry and by very little line broadening, and the associated EFG decreases with the three-halves power of the temperature. For both of the ${mathrm{CdTiO}}_{3}$ phases, the asymmetries derived from the measured frequencies are consistent with the crystal-structure symmetries, and the line shapes could be attributed to static inhomogeneities. For the ferroelectric ${mathrm{PbTiO}}_{3}$ phase, the measured frequencies are consistent with the tetragonal crystal structure. But, the line shapes of the perturbation functions measured at temperatures near ${mathit{T}}_{mathit{c}}$ could not be explained by purely static inhomogeneities. Instead, in contrast to the ${mathrm{CdTiO}}_{3}$ phases, the line broadening at these temperatures was attributed primarily to a dynamic spin-relaxation mechanism.This particular interpretation supports an order-disorder model of the ferroelectric phenomenon." @default.
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• W2086375858 title "Temperature dependence of the nuclear quadrupole interactions at Ti sites in ferroelectric<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>PbTiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and in ilmenite and perovskite<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CdTiO</mml:mi></…" @default.
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• W2086375858 doi "https://doi.org/10.1103/physrevb.42.1885" @default.
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