LGT (La 3 Ga 5.5 Ta 0.5 O 14 ) langatate bulk crystal grown from the melt by Czochralski technique and characterization

Boutahraoui, B.; Nehari, A.; Boy, J.J.; Vacheret, Xavier; Allani, M.; Cabane, H.; Dumortier, M.; Derbal, M.; Lebbou, Kheirréddine

doi:10.1016/j.optmat.2016.09.018

Cited by 14 publications

(12 citation statements)

References 11 publications

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“…The used crystal block is synthesized using the Czochralski method 18 and comes from Cristal Innov. The LGT resonators were achieved in Y-1° cut, thus, the turnover temperature is adjusted around 80°C.…”

Section: Motional Parametersmentioning

confidence: 99%

Carrier suppression system to measure phase noise of acoustic resonators with low motional resistance

Pokharel

Vaillant

Imbaud

et al. 2020

Review of Scientific Instruments

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A carrier suppression system is implemented in order to measure the phase noise of acoustic resonators that have a low motional resistance. A special adapters’ system using transformers is proposed to improve the loaded quality factor of the resonators. With this developed device and described protocol, the inherent noise of resonators can be obtained without the usual electronical oscillator conditioning that could take part in the results. The loaded quality factor is improved from about 10% to 60% of the intrinsic quality factor. As an example, the system is used to study Langatate crystal resonators vibrating at 10 MHz. Langatate crystals can be an alternative to substitute for the quartz crystal resonators for frequency and time applications. Their coupling coefficient and the product quality factor-frequency are normally higher than those in quartz crystal resonators. For ultrastable resonators, the motional resistance obtained with Langatate crystals is about five times lower than that for the quartz crystal; it can reach typically few ohms. These resonators have been characterized in terms of impedance, Q-factors, turnover temperature, amplitude–frequency effect, and phase noise. The short-term stability of these resonators is given in terms of Allan standard deviation. The influence of the driving power is presented.

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Section: Motional Parametersmentioning

confidence: 99%

Carrier suppression system to measure phase noise of acoustic resonators with low motional resistance

Pokharel

Vaillant

Imbaud

et al. 2020

Review of Scientific Instruments

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“…An engine with a combustion pressure sensor can reduce NOx emissions by approximately 30%, and the emission of CO 2 , which is a cause of global warming, by about 10% [2]. La 3 Ga 5 SiO 14 (langasite) family single crystals are attractive piezoelectric materials for use in combustion pressure sensors because they show no phase transitions up to their melting temperature and can be easily grown to large sizes using the Czochralski (Cz) technique [3][4][5][6][7][8][9]. GaPO 4 crystals [10] and rare-earth (Re) calcium oxoborate ReCa 4 O(BO 3 ) 3 crystals [11] have also been reported to be promising candidates because the former has a high phase transition temperature of 930 • C and the latter maintains the piezoelectric property to its melting temperature of approximately 1600 • C. However, bulk growth of GaPO 4 crystals is very difficult [12], while ReCa 4 O(BO 3 ) 3 crystals have very low crystal symmetries (monoclinic m), and then show pyroelectricity [13].…”

Section: Introductionmentioning

confidence: 99%

Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors

et al. 2020

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We present a possible method to reduce the anisotropy of the thermal stress generated on langasite-type La3Ta0.5Ga5.5O14 (LTG) piezoelectric crystals arising from the mismatch of the thermal expansion coefficients and Young’s moduli of the crystals and metals at high temperatures. To formulate this method, the thermal stresses of order-type langasite crystals, in which each cation site is occupied by one element only, were calculated and compared to each other. Our results suggest that the largest cation site affects the thermal stress. We attempted to replace La3+ in LTG by a larger ion and considered Sr2+. Single crystals of strontium-substituted LTG (Sr-LTG) were grown using the Czochralski method. The thermal stress along the crystallographic c-axis decreased but that perpendicular to the c-axis increased by strontium substitution into the LTG crystal. The anisotropic thermal stress was reduced effectively. The Sr-LTG single crystal is a superior candidate material for pressure sensors usable at high temperatures.

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“…It has been realized that one of the popular and well‐known growth methods from melt, the Czochralski pulling technique, is a right alternative to solution growth methods to grow defect free bulk single crystals of BNA. [ 16–23 ] Czochralski pulling technique from the melt is reliable and extensively used to obtain bulk single crystals of inorganic and organic materials for the electronic and optical applications. [ 17–21,23 ] Moreover, its significant features such as fast growth rate, unconstrained growth with container free atmosphere, necking process to avoid any defect formation, enabling to see growth stages at all circumstances, providing temperature stability of

\pm 1^{\circ} C

to grow bulk size single crystals, can enable us to get perfect single crystals.…”

Section: Introductionmentioning

confidence: 99%

Single Crystal Growth of N‐Benzyl‐2‐methyl‐4‐nitroaniline by Seeded Czochralski Pulling Technique for NLO and THz Applications

Kalaivanan

Aruchamy

Srinivasan

2020

Crystal Research and Technology

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Single crystal of N‐benzyl‐2‐methyl‐4‐nitroaniline (BNA), a potential organic nonlinear optical (NLO) material for terahertz (THz) pulse generation, is grown successfully from diffusion controlled melt environment by Czochralski pulling (Cz) technique and is reported for the first time. A solution grown crystal having habitual morphology is used as a seed with pre‐determined crystal rotations at constant melt temperature of 102 °C. Unit cell structure of melt grown BNA is refined using single crystal X‐ray diffraction (SCXRD) analysis and is compared with that of the solution grown one. Crystal packing with the dominance of intermolecular hydrogen bonding such as C─H…O, N─H─O, and C─H…π is examined using 2D finger print (FP) plot and 3D Hirshfeld surface (HS) analysis. The presence of minimal percentage of voids reflects the good stacking of molecular arrangement in the melt grown crystals when compared to the solution grown ones. Crystalline purity is confirmed by powder X‐ray diffraction (PXRD) analysis. Modes of vibrations of different functional groups present and wide optical transparency of the grown BNA are realized using Fourier‐transform infrared (FTIR) and ultraviolet‐visible‐near infrared (UV–vis–NIR) spectroscopic analyses, respectively. Thermal stability and melting point are confirmed through differential scanning calorimetry (DSC).

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LGT (La 3 Ga 5.5 Ta 0.5 O 14 ) langatate bulk crystal grown from the melt by Czochralski technique and characterization

Cited by 14 publications

References 11 publications

Carrier suppression system to measure phase noise of acoustic resonators with low motional resistance

Carrier suppression system to measure phase noise of acoustic resonators with low motional resistance

Control of Thermophysical Properties of Langasite-Type La3Ta0.5Ga5.5O14 Crystals for Pressure Sensors

Single Crystal Growth of N‐Benzyl‐2‐methyl‐4‐nitroaniline by Seeded Czochralski Pulling Technique for NLO and THz Applications

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