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contrary to what is stated, the data in figure 1 suggest a mixed phase, shown data are definitely polycrystalline and the diffraction pattern shows diffuse scattering which looks hexagonal, but the peaks are not indexed, which would give more confidence in the actual crystal structure if it could be shown that the measured d spacings are commensurate with the known values for beta phase NaYF4. Çë½Ì¸÷λ´óÉñ£¬d spacings ÊÇʲô°¡£¿XRDÖеÄÖµÂ𣿠|
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