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Single crystals of ferroelectric lithium niobate–tantalate LiNb1–xTaxO3 solid solutions for high‐temperature sensor and actuator applications
Acta Crystallographica Section B ( IF 2.684 ) Pub Date : 2020-12-07 , DOI: 10.1107/s2052520620014390
Dmitry Roshchupkin , Evgenii Emelin , Olga Plotitcyna , Fahrtdinov Rashid , Dmitry Irzhak , Vasilii Karandashev , Tatiana Orlova , Natalya Targonskaya , Sergey Sakharov , Anatolii Mololkin , Boris Redkin , Holger Fritze , Yuri Suhak , Dmitry Kovalev , Simone Vadilonga , Luc Ortega , Wolfram Leitenberger

Ferroelectric LiNb1–xTaxO3 solid solutions with various Nb/Ta ratio were grown from the melt by the Czochralski method. The exact composition of the grown crystals was determined by inductively coupled plasma atomic mass spectrometry. The dependence of the crystal composition on the composition of the initial melt was obtained and explained by a wide separation between the phase boundaries of the liquid and solid phases on the LiNbO3–LiTaO3 phase diagram. Using high‐resolution X‐ray diffraction, the parameters a and c of a crystal unit cell were determined (LiNb0.88Ta0.12O3: a = 5.1574 Å and c = 13.8498 Å). Further, the Curie temperature TC of the crystals was measured using the differential scanning calorimetry technique. TC was found to depend on the composition of the crystals that allowed conditions for the monodomainization of the grown crystals to be defined (LiNb0.88Ta0.12O3: TC = 1102°C; LiNb0.33Ta0.67O3: TC = 794°C). Finally, the velocity of surface acoustic waves was determined by scanning electron microscopy and X‐ray diffraction techniques (YZ‐cut of a LiNb0.88Ta0.12O3 crystal: V = 3440 m s−1).

中文翻译:

铁电铌酸锂-钽酸锂LiNb1-xTaxO3单晶,用于高温传感器和执行器应用

用切克劳斯基方法从熔体中生长出具有各种Nb / Ta比的铁电LiNb 1– x Ta x O 3固溶体。通过感应耦合等离子体原子质谱法确定生长晶体的确切组成。在LiNbO 3 -LiTaO 3相图上,通过液相和固相的相界之间的较宽分离,可以得到晶体成分对初始熔体成分的依赖性。使用高分辨率X射线衍射确定晶体晶胞的参数ac(LiNb 0.88 Ta 0.12 O 3a= 5.1574埃,c= 13.8498埃。此外,使用差示扫描量热技术测量晶体的居里温度T C。Ť Ç被发现依赖于晶体的组成,对所生长的晶体的monodomainization允许条件来定义(铌酸锂0.880.12 ø 3Ť Ç = 1102℃;铌酸锂0.330.67 ø 3Ť Ç= 794°C)。最后,通过扫描电子显微镜和X射线衍射技术(LiNb 0.88 Ta 0.12 O 3晶体的YZ切割:V = 3440 m s -1)确定表面声波的速度。
更新日期:2020-12-07
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