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Five-fold twinned β-PbF2 nanocrystals in oxyfluoride glass ceramics

机译:氟氧化物玻璃陶瓷中的五重孪晶β-PbF2纳米晶体

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Oxyfluoride glass ceramics (GCs) doped with trivalent lanthanide ions (Ln ~(3+) ) have been prepared using a conventional melting–quenching method and studied by X-ray diffraction (XRD). β-PbF _(2) nanocrystals (NCs) doped with Ln ~(3+) ions (β-PbF _(2) :Ln ~(3+) ) in GCs were released from the GCs by etching off the glass matrix. β-PbF _(2) :Ln ~(3+) NCs can be clearly observed by eliminating the influence of the glass matrix. The nanotwinned structures of β-PbF _(2) :Ln ~(3+) NCs, including two-fold twinned NCs and five-fold twinned NCs, were examined using high-resolution transmission electron microscopy (HRTEM). The five-fold twinned phenomenon in metal fluorides with strong ionicity in oxyfluoride GCs is reported for the first time. Based on detailed analysis of the twinned NC structure, the twinning mechanism of β-PbF _(2) :Ln ~(3+) NCs was proposed. Ln ~(3+) ions and ‘sublattice melting’ of fluorine ions (F ~(?) ) in β-PbF _(2) play extremely important roles in the formation of five-fold twinned β-PbF _(2) :Ln ~(3+) NCs. The nanotwinned structures reported here may have far-reaching significance with respect to the further application of oxyfluoride glass ceramics doped with rare-earth elements and NC fabrication.
机译:掺杂三价镧系离子(Ln〜(3+))的氟氧化物玻璃陶瓷(GCs)已使用常规的熔融淬火方法制备,并通过X射线衍射(XRD)研究。通过蚀刻掉玻璃基质,在GC中掺杂了Ln〜(3+)离子(β-PbF_(2):Ln〜(3+))的β-PbF_(2)纳米晶体(NCs)从GC中释放出来。通过消除玻璃基质的影响,可以清楚地观察到β-PbF_(2):Ln〜(3+)NCs。 β-PbF_(2):Ln〜(3+)NCs的纳米孪晶结构,包括2对孪生的NCs和5对孪生的NCs,使用高分辨率透射电子显微镜(HRTEM)进行了研究。首次报道了在氟氧化物GC中具有强离子性的金属氟化物的五重孪生现象。在详细分析孪生NC结构的基础上,提出了β-PbF_(2):Ln〜(3+)NC的孪生机理。 β-PbF_(2)中的Ln〜(3+)离子和氟离子(F〜(?))的“亚晶格熔化”在五重孪晶β-PbF_(2)的形成中起着极其重要的作用: Ln〜(3+)个NC。此处报道的纳米孪晶结构对于掺杂稀土元素的氟氧化玻璃陶瓷的进一步应用和NC加工可能具有深远的意义。

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