Optimal cut of langasite for high performance SAW devices

Naumenko, Natalya; Solie, L.P.

doi:10.1109/ultsym.1999.849395

Cited by 20 publications

(9 citation statements)

References 8 publications

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“…This crystal cut has zero power flow angle and exhibits temperature compensation at room temperature [5], [6]. Two different platinum (Pt) layer heights (45 nm and 75 nm), on top of a zirconium (Zr) adhesion layer (4nm), were used as metallization ( Figure 1).…”

Section: A Delay Linesmentioning

confidence: 99%

SAW-properties of langasite at high temperatures: Measurement and analysis

Shrena

Eisele

Mayer

et al. 2009

2009 3rd International Conference on Signals, Circuits and Systems (SCS)

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The measurement range of temperature using SAW-devices is depending on the substrate material used in the measurements. This dependence is related to the temperature point, where the substrate loses its piezoelectric properties. This occurs by the SAW-materials such as quartz and lithium niobate at about 570°C or 350°C, respectively. The piezoelectric material langasite (La3Ga5SiO14) has a thermodynamically stable phase and do not lose its piezoelectric properties up to its melting point at about 1470 °C and can be used for SAW devices at high temperatures. This paper presents the measurements of acoustical parameters of langasite up to 750°C. Langasite is used as substrate in the measurements with Euler angles (0°, 138.5°, 26.6°) and two different platinum (Pt) layer heights (45 nm and 75 nm) top of a zirconium (Zr) adhesion layer (4 nm). The investigated acoustic properties of langasite are group and phase velocity, propagation loss, and electromechanical coupling coefficient as functions of temperature. The measured data is analyzed using a special signal processing algorithm to obtain these acoustic properties of the Langasite.

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Section: A Delay Linesmentioning

confidence: 99%

SAW-properties of langasite at high temperatures: Measurement and analysis

Shrena

Eisele

Mayer

et al. 2009

2009 3rd International Conference on Signals, Circuits and Systems (SCS)

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“…93 An ad hoc set of temperature coefficients developed by Naumenko was shown to provide good agreement for the temperature behavior of the Y-46.5° rotated Y-cut substrate. 86 Constants and temperature coefficients presented by Bungo 53 ' 58 demonstrate exceptional agreement between calculations and measurements of all SAW properties for the 50° rotated Y-cut of langasite. It is clear that the room temperature values of the material constants are close to those of Ilyaev, 55 Sakharov, 57 Sorokin, 84 and Bungo, 53 ' 58 with the largest uncertainties in the dielectric and piezoelectric constants.…”

Section: "Best" Materials Constants For Langasitementioning

confidence: 74%

“…91 Similar good agreement was shown by Inoue between calculations of room temperature behavior using material constants from Sakharov 57 and experimental data for SAW propagation on Xcut, Y-cut, and 50° rotated Y-cut langasite, 92 also with poor agreement for the temperature behavior. An even better agreement has been shown by Kadota 93 and Naumenko 86 between room temperature calculations using material constants from Ilyaev 55 and experimental data for LSAW and LPSAW propagation on rotated Y-cut langasite. However, the temperature coefficients of both Sakharov 57 and Ilyaev 55 provided poor agreement for the temperature behavior observed by Kadota; the experimental results for the orientation with a zero temperature coefficient of frequency at room temperature were bracketed by the calculated values.…”

Section: "Best" Materials Constants For Langasitementioning

confidence: 75%

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New Piezoelectric Substrates for Saw Devices

Kosinski

2000

Int. J. Hi. Spe. Ele. Syst.

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Recent developments in single crystal piezoelectric materials have focused on the search for "ideal" materials with zero temperature coefficient of frequency orientations featuring jointly high piezoelectric coupling, high intrinsic Q, zero power flow angle, and minimized diffraction effects. In addition, the desired materials should have no low temperature phase transitions, and a physical chemistry conducive to repeatable, low cost growth and wafer scale device production. As difficult as it might seem to find such "ideal" materials, three completely different but strong candidate materials have emerged recently: the quartz homeotype gallium orthophosphate, the quartz isotype calcium gallogermanates (langasite, langanite, langatate, etc.), and diomignite (lithium tetraborate). The current state-of-the-art and prospects for future development of these materials are considered.

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“…In recent years, novel piezoelectric materials promising for acoustoelectronics have been extensively searched. Much attention has been given to crystals of lanthanum-gallium silicate group which possess both good piezoelectric and thermal properties [1][2][3][4]. Note that SAW velocities in these crystals are small, which makes the crystals attractive for the fabrication of miniature acoustoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Investigation of surface and pseudo-surface acoustic waves excitation and propagation in La<inf>3</inf>Ga<inf>5</inf>SiO<inf>14</inf> crystal

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Plotitcyna

et al. 2013

2013 Joint European Frequency and Time Forum &Amp; International Frequency Control Symposium (EFTF/IFC)

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X-ray diffraction on the La 3 Ga 5 SiO 14 (LGS) crystal modulated by surface (SAW) and pseudo-surface acoustic waves (PSAW) with wavelength of Λ=6 µm was studied using a double axis X-ray diffractometer at the BESSY II synchrotron radiation source. The propagation of SAW and PSAW leads to sinusoidal modulation of the crystal lattice and gives rise to diffraction satellites on the rocking curve, with the intensity and angular divergence between the diffraction satellites depending on the wavelength and amplitude of the crystal lattice acoustic modulation. The analysis of diffraction spectra enables the determination of the amplitude and acoustic wavelengths, and power flow angles of acoustic energy propagation. The investigation of acoustic wave fields showed that PSAW is a flowing back wave.

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Optimal cut of langasite for high performance SAW devices

Cited by 20 publications

References 8 publications

SAW-properties of langasite at high temperatures: Measurement and analysis

SAW-properties of langasite at high temperatures: Measurement and analysis

New Piezoelectric Substrates for Saw Devices

Investigation of surface and pseudo-surface acoustic waves excitation and propagation in La<inf>3</inf>Ga<inf>5</inf>SiO<inf>14</inf> crystal

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