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Dielectric Constant Of Lithium Tantalate

Tantalum 06/19/2020

the dielectric constant of lithium tantalate

Dielectric Constant Of Lithium Tantalate

Temperature Dependence of Permittivity and Loss.

Lithium tantalate (LiTaO3) exhibits excellent electro-optical, piezoelectric, and pyroelectric properties and a very low thermal expansion.

The temperature dependences of εr and loss tangent (tanδ) of LiTaO

As it is well known the microwave properties of dielectric materials can be measured using

various methods such as the waveguide technique [10], stripline method [11] and various types of the dielectric resonator method (Hakki-Coleman DR [12, 13, 14], post-DR and Split post [15] and split cavity [16]).

The choice of a measurement method depends on the values of tanδ and ε of a dielectric under test.

In this paper, we present results of precise measurements of the perpendicular component of permittivity and loss tangent of c-axis cut Lithium Tantalate at varying temperatures using three Hakki Coleman dielectric resonators.

Two LiTaO cut from the same boule grown by Sawyer Research (USA) [17] and machined into cylindrical shapes of 3.073 mm height and 5.335 mm diameter ((#1 - with the aspect ratio equal to 1.73) and of 3.93 mm height and 5.32 mm diameter (#2 - aspect ratio of 1.35).

For the temperature range from 14 K to 80K, we used a very precise superconducting dielectric resonator at a frequency of 11.4 GHz, and from 14 K to 295 K - a copper dielectric resonator.

Measurements were repeated at a frequency of 10 GHz with another copper the dielectric resonator in the temperature range from 10 K to 295 K.

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To ensure high accuracy in the calculated values of εr and tanδ for varying temperatures we have used the recently developed multifrequency Transmission Mode Q-Factor (TMQF) technique [18, 19] for processing of measured S parameters of the dielectric resonators and computation of the resonant frequency and unloaded Qo cryogenic temperatures it is not feasible to calibrate for cables and adaptors inside a dewar used for the tests.

Hence typically measured parameters are subjected to errors resulting from the frequency-dependent delay introduced by the cables.

The TMQF technique eliminates errors introduced by the presence of cables and adaptors as well as noise and cross-talk between coupling loops.

The thermal expansion of LaTaO samples was also taken into account in the calculations of ε

the dielectric constant of lithium tantalate

Dielectric and pyroelectric properties of ultrathin

Crystalline lithium tantalate (LiTaO3) is well known for its unique optical and ferroelectric properties.

Dielectric and pyroelectric properties of ultrathin, monocrystalline lithium tantalate

Author links open overlay panel MarcoSchossig

Monocrystalline LiTaO3 thin films with a minimum thickness of 0.4 μm were fabricated.

•Dielectric and pyroelectric properties were studied versus thickness and temperature.

•The dielectric loss factor is increased with the reduction of film thickness.

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•Stoichiometric LiTaO3 shows lower performance than congruent LiTaO3.

•Pyroelectric detectors with a performance close to the limit become feasible.

Ultrathin, self-supporting lithium tantalate (LiTaO3) wafers have been fabricated out of a single crystal with a minimum thickness of about 0.4 μm using ion-beam milling.

The most decisive parameters (pyroelectric coefficient, relative permittivity, and dielectric loss factor) for their use in pyroelectric radiation detectors were studied in dependence on film thickness and temperature.

The potential performance of pyroelectric materials was evaluated using appropriate figures of merit.

In addition, the dielectric and pyroelectric properties of stoichiometric LiTaO3 were investigated and compared to congruent LiTaO3 bulk material conventionally used for pyroelectric detectors.

Lithium Tantalate crystal ( LiTaO3 )

Lithium Tantalate exhibits unique electro-optical, pyroelectric, and piezoelectric properties combined with good mechanical and chemical stability and, wide transparency range and high optical damage threshold.

This makes LiTaO3 well-suited for numerous applications including electro-optical modulators, pyroelectric detectors, optical waveguide and SAW substrates, piezoelectric transducers, etc.

Lithium tantalite (LiTaO3) is similar to lithium niobate.

Both are grown by the Czochralski method which yields large, high-quality single crystals.

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Lithium tantalate possesses unique electro-optical, acoustic, piezoelectric, and pyroelectric properties, which makes it attractive for numerous applications including electro-optical modulators, pyroelectric detectors, piezoelectric transducers, and sensors.

It has good mechanical and chemical stability, a wide transparency range, and a high optical damage threshold.

Lithium Tantalate Properties

Thermal expansion coefficient, 10-6/ °C, aa = 16 ac = 4. Specific heat, cal/g°C, 0.06. Thermal conductivity , mW/cm °C, 46. Dielectric Constant (@ 100 KHz).

we supply LiTaO3 wafers as well as LiTaO3 bulk crystals.

An example of LiTaO3 crystal is shown below

LiTaO3 crystal for EOM (Electro-optic modulator) - request a quote

5 mm (X) x 5 mm (Z) x 40 mm (Y)

Sides 5x5 are polished 20/10 S/D and AR coated

Metal electrodes Au+Cr

lambda/4 flat

< 30" parallel

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We have crystals of different cuts and sizes available in stock that can be quickly AR coated for the required wavelength and metalized if necessary.

LiTaO3

Fundamentally different responses of a LiTaO 3 thin-film detector are observed when it is subjected to short microwave pulses as the pulse intensity is altered over a wide range.

We start from weak microwave pulses which lead to only trivial pyroelectric peak response.

However, when the microwave pulses become intense, the normally expected pyroelectric signal seems to be suppressed and the sign of the voltage signal can even be completely changed.

Analysis indicates that while the traditional pyroelectric model, which is a linear model and works fine for our data in the small regime, it does not work anymore in the large-signal regime.

Since the small-signal model is the key foundation of electromagnetic-wave sensors based on pyroelectric effects, such as pyroelectric infrared detectors, the observation in this work suggests that one should be cautious when using these devices in intense fields.

In addition, the evolution of the detector signal with respect to excitation strength suggests that the main polarisation process is changed in the large-signal regime.

This is of fundamental importance to the understanding of how crystalline solids interact with intense microwaves.

Possible causes of nonlinear behavior are discussed.

Material: Lithium Tantalate (LiTaO3)

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Dielectric Constant‎: ‎41-53 @298K

Refractive Index‎: ‎no = 2,139, ne = 2,139 @633

Thermal Conductivity‎: ‎4,6 W/m·K; 8,78 W/m·K

Heat Capacity‎: ‎424 J/(K·kg)

electro-optic Q-switch, integrated optical substrate, sensor, frequency converter

stoichiometric or congruent

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Temperature dependence of permittivity and loss tangent of lithium tantalate at microwave frequencies

title={Temperature dependence of permittivity and loss tangent of lithium tantalate at microwave frequencies},

Lithium tantalate (LiTaO/sub 3/) exhibits excellent electro-optical, piezoelectric, and pyroelectric properties and a very low thermal expansion.

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.

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