Abstract
Commercially available single crystals of (111) SrTiO3 were found to contain impurities of varying amounts that strongly affected their dielectric performance at cryogenic temperatures. Three crystals with total impurities of 111, 126, and 625 ppm, primarily of barium and yttrium, were analyzed. Relative permittivity (εr) and loss tangent were investigated with high resolution as a function of temperature (4 K to 100 K), DC voltage (0 V/cm to 800 V/cm), and frequency (100 Hz to 1 MHz). An impurity level as low as ≈500 ppm barium resulted in an increase of the maximum permittivity (εm) to approximately 50,000 at 6 K. This relatively high permittivity value was tunable by up to 80% at a low DC field of less than 1 kV/cm between 4 and 80 K. It is suggested that in this temperature range and with no DC field applied, SrTiO3 single crystals doped with Ba may be used as a highly sensitive temperature sensor.
Recommended Citation
H. Trinh et al., "Effects of yttrium and barium trace impurities on the dielectric properties of SrTiO3 (111) single crystals at cryogenic temperatures," Journal of Materials Science: Materials in Electronics, vol. 36, no. 31, Springer, Nov 2025.
The definitive version is available at https://doi.org/10.1007/s10854-025-15957-8
Department(s)
Materials Science and Engineering
Publication Status
Open Access
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2026 The Authors, All rights reserved
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution 4.0 License.
Publication Date
2025-11-03
