Material parameters of Ca&lt;inf&gt;3&lt;/inf&gt;TaGa&lt;inf&gt;3&lt;/inf&gt;Si&lt;inf&gt;2&lt;/inf&gt;O&lt;inf&gt;14&lt;/inf&gt; single crystal revisited

SAW resonators were patterned on CTGS wafers with different orientations at different propagation angles. Ir was used as a metal without additional adhesion layers. Resonator responses were acquired with a network analyzer. Resonance frequencies of the responses were measured and processed to obtain temperature behavior. For the cut with Euler angles (0, 90°, 0) almost linear behavior was observed with TCF close to -35 ppm/°C. The turnover point of the fitted parabolic curve gradually changed with propagation angle ψ (0, 90°, ψ) from negative temperatures up to about +550°C at (0, 90°, 90°). This also means that this material gives orientations (close to (0, 90°, 40°)) with the turnover point near the room temperature. Surrounding orientations should probably be same useful (the turnover point change is about 0.5°C with ψ angle change by 1' for these orientations). The coefficient at the quadratic term (with Ir metal) has a low value of about -30 ppb/°C 2 . This value is several times lower than that of most langasite cuts and is close to that of ST-quartz. The material seems to be chemically stable at high temperatures. CTGS shows great potential and useful properties for devices operating in a wide temperature range. Similar to ST-quartz, CTGS can serve for temperature compensated resonators and filters at room temperature. It can also work in devices operating at temperatures up to several hundred degrees C.

show abstract

“…The use of free VCAL software by Ken-ya Hashimoto is truly appreciated. CTGS constants were kindly provided by A. Sotnikov [3].…”

Section: Acknowledgmentmentioning

confidence: 99%

“…The constants of CTSG single crystals were measured at room temperature in [3]. Based on these constants and using modified VCAL free software contour maps of main SAW characteristics were calculated for the wave with lowest phase velocity (Figures 1-4).…”

Section: Introductionmentioning

confidence: 99%

Investigation of the CTGS single crystals potential for high temperature SAW devices

Sakharov

Zabelin

Medvedev

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

Self Cite

View full text Add to dashboard Cite

show abstract

“…High quality piezoelectric single crystals of Ca 3 TaGa 3 Si 2 O 14 (CTGS) in the form of boules up to length and diameter of 80 mm have been grown by JSC FomosMaterials using the Czochralski method [1]- [3]. The crystals have a melting point of about 1400°C without any phase transition below this temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Elastic, Cij, and piezoelectric, e ij , material constants have been measured at room temperature by the ultrasonic pulse-echo technique [3] and [4] as well as by the resonance method [5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

CTGS material parameters obtained by versatile SAW measurements

Biryukov

Schmidt

Сотников

et al. 2014

2014 IEEE International Ultrasonics Symposium

Self Cite

View full text Add to dashboard Cite

Recently big size high quality piezoelectric single crystals of Ca3TaGa3Si2O14 (CTGS) have been grown. This temperature durable crystal is very promising for future application in different devices based on surface acoustic waves (SAW) due to its high electromechanical coupling compared to quartz. In contrast to the popular langasite, CTGS is a more ordered compound and therefore stands for better characteristics at both, high temperatures and high frequencies. During the last decade several sets of material constants for CTGS were published extracted from bulk acoustic wave measurements on small samples, but these results are strongly different from each other. Moreover, all published constant sets lead to unacceptable numerical differences for calculated SAW velocities when compared to recent measurements of SAW velocities on large CTGS wafers. In this work we present a new set of room temperature CTGS material constants, extracted by combination of high-precision SAW phase velocity measurements with proprietary numerical procedures developed in-house.

show abstract

X-ray diffraction on the X-cut of a Ca3TaGa3Si2O14 single crystal modulated by a surface acoustic wave

Иржак

Рощупкин

2014

Journal of Applied Physics

View full text Add to dashboard Cite

The result of X-ray diffraction study on a single crystal of the calcium-gallogermanate family Ca 3 TaGa 3 Si 2 O 14 (CTGS) modulated by a surface acoustic wave (SAW) is presented. The power flow angle for SAW propagating along the X 2 axis of the X-cut in CTGS was measured. The rocking curves for the CTGS crystal were recorded at different amplitudes of an input high frequency electric signal on interdigital transducer used to excite a SAW. Based on the data obtained, intensity dependence of diffraction satellites on the amplitude of electric signal exciting a SAW was built. Numerical simulation of the crystal rocking curves and dependence of diffraction satellite intensities on the SAW amplitude enabled the selection of a set of material constants at which the most complete coincidence of experimental and calculated results is observed. V C 2014 AIP Publishing LLC. [http://dx.

show abstract

Material parameters of Ca<inf>3</inf>TaGa<inf>3</inf>Si<inf>2</inf>O<inf>14</inf> single crystal revisited

Cited by 6 publications

References 9 publications

Investigation of the CTGS single crystals potential for high temperature SAW devices

Investigation of the CTGS single crystals potential for high temperature SAW devices

CTGS material parameters obtained by versatile SAW measurements

X-ray diffraction on the X-cut of a Ca3TaGa3Si2O14 single crystal modulated by a surface acoustic wave

Contact Info

Product

Resources

About