Effect of internal pressure on incipient ferroelectricity of nanoconfined water molecules observed in hydrothermally grown beryl crystals

0570820 - FZÚ 2024 RIV DE eng J - Journal Article
Gorshunov, B. - Abalmasov, V. - Uskov, V. - Chan, Y.T. - Uykur, E. - Abramov, P. - Dressel, M. - Thomas, V. - Savinov, Maxim
Effect of internal pressure on incipient ferroelectricity of nanoconfined water molecules observed in hydrothermally grown beryl crystals.
Physica Status Solidi B. Roč. 260, č. 3 (2023), č. článku 2200405. ISSN 0370-1972. E-ISSN 1521-3951
Institutional support: RVO:68378271
Keywords : dielectric spectroscopy * ferroelectrics * phase transitions
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 1.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1002/pssb.202200405

Quasistatic dielectric permittivity of D2O type I molecules within hydrothermally grown beryl crystals characterized by different internal pressure and content of D2O type II molecules is measured at temperatures 4–300 K. All crystals are found to display quantum paraelectric behavior of the D2O-I molecular subsystem permittivity, that is, permittivity growth while cooling from room temperature followed by saturation below 15–40 K. Processing the data with the Barrett expression shows that excess internal pressure and excess content of D2O-II molecules lead to an increase in quantum temperature T1 and a decrease in the Curie constant C, with the Curie temperature TC remaining unchanged. The discovered strengthening of quantum effects (growth of T1) within an ensemble of dipole–dipole-coupled D2O-I mol ecules is associated with an enhanced azimuthal tunneling of these molecules within the hexagonal localizing potential.
Permanent Link: https://hdl.handle.net/11104/0342158