The growth and characterization of six inch lithium niobate crystals with high homogeneity
CrystEngComm, ISSN: 1466-8033, Vol: 22, Issue: 4, Page: 794-801
2020
- 22Citations
- 22Captures
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Article Description
As a kind of excellent piezoelectric material, lithium niobate (LiNbO) has been widely used for surface acoustic wave (SAW) devices. On a self-designed automatic diameter control system, large diameter (6 inch) LiNbO crystals without cracks are successfully grown by choosing a suitable temperature gradient, starting composition, and growth parameters with the Czochralski method. The constituent phases of the LiNbO crystals and their polycrystalline precursor are determined by X-ray powder diffraction, and the Li content along the crystal growth direction is determined by Raman scattering spectroscopy. The temperature gradient and growth parameters that influence the growth of the large diameter crystals are discussed in detail. The chemical analyses reveal that the 6 inch LiNbO crystals have high homogeneity. The average Curie temperature is 1143.04 ± 1.3 °C, and the piezoelectric coefficient d is up to 19.8 pC N. The specific heat (C), thermal expansion coefficients (α and α), thermal diffusion coefficients (λ and λ), and thermal conductivities (κ and κ) of the LiNbO crystals are also determined.
Bibliographic Details
Royal Society of Chemistry (RSC)
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