A5103147998- Photorefractive and Nonlinear Optics
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Photonic and Optical Devices
- Solid-state spectroscopy and crystallography
- Microwave Dielectric Ceramics Synthesis
- Optical and Acousto-Optic Technologies
- Acoustic Wave Resonator Technologies
Justus-Liebig-Universität Gießen
2024
The ferroelectric to paraelectric phase transition in ${\mathrm{LiTaO}}_{3}$ and pure as well Mg-doped ${\mathrm{LiNbO}}_{3}$ is investigated theoretically by atomistic calculations the framework of density functional theory, experimentally calorimetry electrical conductivity measurements. First-principles models within stochastic self-consistent harmonic approximation (SSCHA) allow consider anharmonic effects thus obtain a realistic estimate Curie temperature ${T}_{C}$ both ferroelectrics....
The investigation of the structural phase transition in vicinity Curie temperature crystals is motivated by expected combination advantageous high‐temperature properties and , including high piezoelectric modules remarkable stability, respectively. marks ultimate limit for exploiting properties; however, transition‐related modifications might impact this other even below . Remarkably, from ferroelectric to paraelectric phase, whose strongly depends on composition x shows a significant drop...
Lithium niobate (LNO) and lithium tantalate (LTO) see widespread use in fundamental research commercial technologies reaching from electronics over classical optics to integrated quantum communication. The mixed crystal system (LNT) allows for the dedicate engineering of material properties by combining advantages two parental materials LNO LTO. Vibrational spectroscopies such as Raman spectroscopy or (Fourier transform) infrared (IR) are vital techniques provide detailed insight into...
The investigation of the structural phase transition in vicinity Curie temperature $T_c$ LiNb$_{1-x}$Ta$_x$O$_3$ crystals is motivated by expected combination advantageous high-temperature properties LiNbO$_3$ and LiTaO$_3$, including high piezoelectric modules remarkable stability, respectively. marks ultimate limit for exploiting properties, however related modifications might impact this other even below $T_c$. Remarkably, from ferroelectric to paraelectric phase, whose strongly depends...
The ferroelectric to paraelectric phase transition in LiTaO$_3$ and pure as well Mg doped LiNbO$_3$ is investigated theoretically by atomistic calculations the framework of density functional theory, experimentally calorimetry electrical conductivity measurements. First principles models within stochastic self-consistent harmonic approximation (SSCHA) allow consider anharmonic effects thus obtain a realistic estimate Curie temperature $T_C$ both ferroelectrics. \textit{Ab initio} molecular...
Lithium niobate‐lithium tantalate solid solutions are new piezoelectric crystals that enable to combine the advantages of their edge compounds with respect high thermal stability lithium and Curie temperature niobate. This study aims determine acoustic losses bulk resonators varying Nb/Ta ratios correlation charge transport at temperatures up 900 °C reduced oxygen partial pressures. Techniques such as resonant spectroscopy contactless ringdown used losses. Further, electrical conductivity is...