Temperature Dependence of Permittivity and Loss Tangent of Lithium Tantalate at Microwave Frequencies
Abstract
Lithium tantalate (LiTaO/sub 3/) exhibits excellent electro-optical, piezoelectric, and pyroelectric properties and a very low thermal expansion. In this paper, we report measurements of loss tangent and the real part of the relative permittivity /spl epsiv//sub r/spl perp// measured in c-axis LiTaO/sub 3/ crystals in the temperature range from 14 K to 295 K at a frequency of 11.4 and 10 GHz. Microwave properties of LiTaO/sub 3/ were determined by measurements of the resonance frequency and the unloaded Q/sub o/ factor of a TE/sub 011/ mode cylindrical cavity containing the sample under test and accounting for uncalibrated cables and adaptors inside the cryocooler. The permittivity of LiTaO/sub 3/ was found to increase from 38.9 to 41.1 and the loss tangent to change from 1.1/spl times/10/sup -4/ to 6.5/spl times/10/sup -4/ over the full temperature range. Due to its low loss and relatively high permittivity, LiTaO/sub 3/ is suitable for microwave applications.
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LiTaO3 has Pockels coefficient r33 = 30.5 pm/V, birefringence reduced by more than 10 times, higher optical destruction threshold, and 10-times-lower microwave losses compared to LN.
“Although the Pockels coefficient is similar to that of LN (r33 = 30.5 pm/V), LT exhibits advantages such as: a birefringence reduced by more than 10 times (which suppresses mode mixing in the guides); a higher optical destruction threshold; and 10-times-lower microwave losses [187,188], essential for quantum transduction [189,190].”
From Metal Oxide Thin Films for Advanced Photonic Applications (2026) · cites this paper as [188]
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- Authors
- Jacob, M. V., Hartnett, J. G., Mazierska, J., Giordano, V., Krupka, J., & Tobar, M. E.
- Affiliations
- James Cook University (AU)
- The University of Western Australia (AU)
- Massey University (NZ)
- Centre National de la Recherche Scientifique (FR)
- Warsaw University of Technology (PL)
- Venue
- IEEE Transactions on Microwave Theory and Techniques
- Published
- 2004-02
- Volume
- 52
- Issue
- 2
- Pages
- 536-541
- ISSN
- 0018-9480 (ISSN-L)
- OpenAlex
- W2097653326
- Cited by
- 27
- References
- 18
- Citations by year
- 2026: 7 · 2025: 2 · 2024: 5 · 2022: 1 · 2021: 1 · 2020: 3 · 2019: 1 · 2018: 1
- FWCI
- 0.65
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- IEEE Transactions on Microwave Theory and Techniques (publishedVersion)
- UWA Profiles and Research Repository (UWA) (submittedVersion)
- HAL (submittedVersion)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Microwave Dielectric Ceramics Synthesis
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Microwave and Dielectric Measurement Techniques
- Physical Sciences › Materials Science › Materials Chemistry › Ferroelectric and Piezoelectric Materials
- Keywords
- lithium tantalate, temperature dependence, dielectric constant, loss tangent, microwave dielectric properties, unloaded Q, low-loss dielectrics
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