High-velocity non-attenuated acoustic waves in LiTaO3/quartz layered substrates for high frequency resonators

Naumenko, Natalya

doi:10.1016/j.ultras.2019.03.001

Cited by 49 publications

(28 citation statements)

References 17 publications

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“…Li and Ta co-doping shows the lowest velocities, which mainly due to the fact that Ta is the heaviest among our considered elements. The velocities at any particular concentration of our considered co-dopants are quite comparable with these of Sc doped w-AlN, and also comparable with the velocities in the range of 5-7 km/s for LiNbO 3 or LiTaO 3 crystals depending on the cuts [53,56].…”

Section: Resultssupporting

confidence: 61%

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta co-doped w-AlN

Noor‐A‐Alam¹,

Olszewski²,

Campanella³

et al. 2020

Preprint

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<div>Based on density functional theory, we show that Li and</div><div>X (X=V, Nb and Ta) co-doping in 1Li:1X ratio broadens the</div><div>compositional freedom for significant piezoelectric enhancement in w-AlN, promising them to be good alternatives of expensive Sc. Interestingly, these co-doped w-AlN also show quite large spontaneous electric polarization about 0.80 C/m2 with the possibility of ferroelectric polarization switching, opening new possibilities in wurtzite nitrides. Increase in piezoelectric stress constant (e33) with decrease in elastic constant ( C33 ) results enhancement in piezoelectric strain constant ( d33 ), which is desired for improving the performance of resonators for high frequency RF signals. Also, these co-doped w-AlN are potential lead-free piezoelectric materials for energy harvesting and sensors as they improve the longitudinal electromechanical coupling constant (K^2 33), transverse piezoelectric strain constant (d31), and figure of merit for power generation. However, the enhancement in K^2 33 is not as pronounced as that in d33, because co-doping increases the dielectric constant. The longitudinal acoustic wave velocity (7.09 km/s) of Li0.1875Ta0.1875Al0.625N is quite comparable with that of commercially used piezoelectric LiNbO3 or LiTaO3 in special cuts (about 5~7 km/s) despite the fact that the acoustic wave velocities drop with co-doping or Sc concentration.</div>

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Section: Resultssupporting

confidence: 61%

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta co-doped w-AlN

Noor‐A‐Alam¹,

Olszewski²,

Campanella³

et al. 2020

Preprint

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show abstract

“…However, further simulations showed that the longitudinal wave is not entirely localized in the film even when its attenuation coefficient tends to zero, and the acoustic energy stays distributed between the film and the substrate. Non-attenuated longitudinal waves with similar structure were recently found in a lithium tantalate plate bonded to a quartz substrate [15]. Normalized frequency, 2pf, km/s…”

supporting

confidence: 55%

Non-leaky longitudinal acoustic modes in ScxAl1-xN/sapphire structure for high-temperature sensor applications

Aubert

Naumenko

Bartoli

et al. 2019

Applied Physics Letters

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“…For designing electroacoustic devices, e.g., film bulk acoustic resonators (FBARs) or surface acoustic wave (SAW) resonators for their applications in the frequency filters and duplexers for next-generation wireless communication systems, acoustic wave velocity is an important parameter, which is also sometimes used to estimate the elastic constants in experiments. Compared to other piezoelectrics, , a high acoustic wave velocity of w-AlN is one of the key advantages for high-frequency SAW resonators. We compute the elastic wave velocity by solving the Christoffel equation ( C ijkl η j η k – ρ v 2 δ ij ) u l = 0, where C ijkl is the elastic coefficient factor, η represents the propagation direction of the wave, ρ is the mass density, v is the velocity, and u stands for the wave polarization .…”

Section: Resultsmentioning

confidence: 99%

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta Co-Doped w-AlN

Noor‐A‐Alam

Olszewski

Campanella

et al. 2020

ACS Appl. Mater. Interfaces

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Based on density functional theory, we show that Li andX (X=V, Nb and Ta) co-doping in 1Li:1X ratio broadens thecompositional freedom for significant piezoelectric enhancement in w-AlN, promising them to be good alternatives of expensive Sc. Interestingly, these co-doped w-AlN also show quite large spontaneous electric polarization about 0.80 C/m2 with the possibility of ferroelectric polarization switching, opening new possibilities in wurtzite nitrides. Increase in piezoelectric stress constant (e33) with decrease in elastic constant ( C33 ) results enhancement in piezoelectric strain constant ( d33 ), which is desired for improving the performance of resonators for high frequency RF signals. Also, these co-doped w-AlN are potential lead-free piezoelectric materials for energy harvesting and sensors as they improve the longitudinal electromechanical coupling constant (K^2 33), transverse piezoelectric strain constant (d31), and figure of merit for power generation. However, the enhancement in K^2 33 is not as pronounced as that in d33, because co-doping increases the dielectric constant. The longitudinal acoustic wave velocity (7.09 km/s) of Li0.1875Ta0.1875Al0.625N is quite comparable with that of commercially used piezoelectric LiNbO3 or LiTaO3 in special cuts (about 5~7 km/s) despite the fact that the acoustic wave velocities drop with co-doping or Sc concentration. File list (2)download file view on ChemRxiv codoped-AlN.pdf (0.93 MiB) download file view on ChemRxiv codoped-

show abstract

High-velocity non-attenuated acoustic waves in LiTaO3/quartz layered substrates for high frequency resonators

Cited by 49 publications

References 17 publications

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta co-doped w-AlN

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta co-doped w-AlN

Non-leaky longitudinal acoustic modes in ScxAl1-xN/sapphire structure for high-temperature sensor applications

Large Piezoelectric Response and Ferroelectricity in Li and V/Nb/Ta Co-Doped w-AlN

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