Langasite for High Temperature Surface Acoustic Wave Applications

Hornsteiner, J.; Born, E.; Riha, E.

doi:10.1002/1521-396x(199709)163:1<r3::aid-pssa99993>3.0.co;2-8

Cited by 72 publications

(23 citation statements)

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“…However, the maximum operating temperature of LN-based piezoelectric devices, restricted by their low electrical resistivity (a requirement of >10 6 Ohm· cm was proposed for comparison, where the materials with low resistivity yet can be used for high frequency applications [1]) at elevated temperature is limited to <600 °C, though the Curie temperature is above 1150 °C [5]. Other important trigonal piezoelectric crystals include the langasite family with the general formula of A 3 BC 3 D 2 O 14 [6][7][8][9][10][11][12] and gallium orthophosphate GaPO 4 , in the point group of 32 [13][14][15][16][17][18][19], these crystals were reported to show modest piezoelectric coefficients (5-7 pC/N) and high melting points (1300-1500 °C for langasite family crystals and ~1670 °C for GaPO 4 ), prior to which, there are no phase transitions observed for langasite family crystals (the phase transition for GaPO 4 is about 970 °C). However, the costly component Ga 2 O 3 restricted their further implements.…”

Section: Open Accessmentioning

confidence: 99%

“…and fresnoite crystals (point group 4mm, such as Ba 2 TiSi 2 O 8 ) were investigated for piezoelectric applications. These crystals show the merits of high melting points (1400-1700 °C) and high effective piezoelectric coefficients d eff (5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) pC/N) [20][21][22][23][24][25][26]; the evaluations of the temperature dependence of dielectric, piezoelectric and electromechanical properties, however, are limited. Of particular significance is that the monoclinic rare-earth calcium oxyborate crystals (ReCa 4 O(BO 3 ) 3 , ReCOB, Re: rare earth), which have been extensively investigated for nonlinear optical applications in the last two decades [27][28][29][30][31][32][33], were reported to exhibit good piezoelectric properties and high electrical resistivity at an elevated temperature of 1000 °C, with no phase transition prior to their melting points (~1400-1520 °C) [1][2][3][34][35][36][37][38].…”

Section: Open Accessmentioning

confidence: 99%

See 1 more Smart Citation

Rare-Earth Calcium Oxyborate Piezoelectric Crystals ReCa4O(BO3)3: Growth and Piezoelectric Characterizations

Duan

Zhang

et al. 2014

Crystals

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Rare-earth calcium oxyborate crystals, ReCa 4 O(BO 3 ) 3 (ReCOB, Re = Er, Y, Gd, Sm, Nd, Pr, and La ), are potential piezoelectric materials for ultrahigh temperature sensor applications, due to their high electrical resistivity at elevated temperature, high piezoelectric sensitivity and temperature stability. In this paper, different techniques for ReCOB single-crystal growth are introduced, including the Bridgman and Czochralski pulling methods. Crystal orientations and the relationships between the crystallographic and physical axes of the monoclinic ReCOB crystals are discussed. The procedures for dielectric, elastic, electromechanical and piezoelectric property characterization, taking advantage of the impedance method, are presented. In addition, the maximum piezoelectric coefficients for different piezoelectric vibration modes are explored, and the optimized crystal cuts free of piezoelectric cross-talk are obtained by rotation calculations.

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Section: Open Accessmentioning

confidence: 99%

Section: Open Accessmentioning

confidence: 99%

Rare-Earth Calcium Oxyborate Piezoelectric Crystals ReCa4O(BO3)3: Growth and Piezoelectric Characterizations

Duan

Zhang

et al. 2014

Crystals

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“…Alternative Substratmaterialien wie z. B. Langasit weisen eine viel h€ o ohere thermische Stabilit€ a at auf und auf Platin basierende Schichten eine h€ o ohere Best€ a andigkeit gegen€ u uber thermischer Zersetzung (Hornsteiner, Born, Riha, 1997). Als n€ a achste H€ u urde soll eine Einsatztemperatur von 600 C f€ u ur SAW-Funksensoren erreicht werden.…”

Section: Zusammenfassung Und Forschungsausblickunclassified

Neue Anwendungen von Oberflächenwellen-Funksensoren

Binder

2010

Elektrotech. Inftech.

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A. BinderEs werden aktuelle Forschungsarbeiten von Oberfl€ a achenwellen-basierenden Funksensoren vorgestellt, welche insbesondere gegen€ u uber Halbleiter-Transponder eine besonders gute thermische Stabilit€ a at von € u uber 300 C aufweisen. Die Sensoren machen sich einen Piezoeffekt zunutze, indem mittels einer Wandlerstruktur auf der Oberfl€ a ache des Sensors so genannte Oberfl€ a achenwellen erzeugt werden. Je nach Temperatur oder mechanischer Verspannung werden die Oberfl€ a achenwellen beeinflusst. Diese € A Anderungen der Oberfl€ a achenwellen werden f€ u ur den Sensoreffekt genutzt. Durch Anbringung weiterer Oberfl€ a achenwellenreflektoren auf dem Sensor sind die Sensoren eindeutig unterscheidbar. Dies f€ u uhrt zur Anwendung als Hochtemperatur-Identifikationssystem (RFID -radio freqency identification).Industrielle Anwendungen der Technologie sind vielf€ a altig. Beispiele aus der Stahlindustrie, Maschinenbau und Energieversorgung werden kurz vorgestellt. Schlü sselwö rter: Oberfl€ a achenwellen; Funksensor; RFIDNew applications of surface acoustic wave wireless sensors.The latest research work on surface acoustic wave wireless sensors is presented. The main advantage of surface acoustic wave sensors is their outstanding thermal stability specially compared to semiconductors. The sensors utilize a piezo-effect that creates so-called surface acoustic waves by means of a transducer structure on the surface of the sensor. Depending on temperature or mechanical strain the surface acoustic waves are affected. These changes on the surface acoustic waves are used for the sensor effect. The sensors can be clearly distinguished when further surface acoustic wave reflectors are introduced. This leads to the application as a high temperature RFID system (radio frequency identification).Industrial applications of the technology are manifold. Examples from steel industry, mechanical engineering and energy supply are briefly discussed.

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“…The transponders' operating temperature often exceeds 200°C in these applications and is way above the thermal limit of CMOS devices. Surface acoustic wave (SAW) devices are excellent candidates for high temperature applications as their operation has been shown at temperatures of 1000°C (Hornsteiner, 1997). With the use of an RF (radio frequency) antenna SAW devices can be interrogated passively and wirelessly.…”

Section: Introductionmentioning

confidence: 99%