Abstract:A variety
of ReO3-type and double-ReO3-type
metal fluorides have been examined for their potential as negative
and low-thermal-expansion materials. However, they are susceptible
to unwanted phase transitions on cooling and modest compression. The
incorporation of excess fluoride into the ReO3 structure,
to form materials such as [Mg1–x
Zr
x
]ZrF6+2x
and cubic LuZrF7, can be used to eliminate unwanted phase
transitions and control thermal expansion. Variable-temperature powder
diffraction measurements on cubi… Show more
“…This phenomenon has also been observed in many other NTE/ZTE materials. 43,44 To demonstrate the practical application of the as-synthesized AlP 3 O 9 :Cr 3+ NIR phosphors, a NIR pc-LED was packaged by assembling the AlP 3 O 9 :6%Cr 3+ phosphor with commercial 450 nm InGaN chips (the inset in Fig. 5a).…”
A near zero thermal expansion NIR phosphor, AlP3O9:Cr3+, with high emission efficiency and excellent thermal stability is synthesized. A compact NIR pc-LED is fabricated and has a promising application in advanced nondestructive analysis technology.
“…This phenomenon has also been observed in many other NTE/ZTE materials. 43,44 To demonstrate the practical application of the as-synthesized AlP 3 O 9 :Cr 3+ NIR phosphors, a NIR pc-LED was packaged by assembling the AlP 3 O 9 :6%Cr 3+ phosphor with commercial 450 nm InGaN chips (the inset in Fig. 5a).…”
A near zero thermal expansion NIR phosphor, AlP3O9:Cr3+, with high emission efficiency and excellent thermal stability is synthesized. A compact NIR pc-LED is fabricated and has a promising application in advanced nondestructive analysis technology.
“…The training data contains nearly 200 NTE materials from the published literature 16–127 and about 230 positive thermal expansion (PTE) data with the same structures or elements as NTE materials. To improve the reliability of the prediction capability, we employed the three-step ML method with data augmentation and cross-validation.…”
Discovering new negative thermal expansion (NTE) materials is a great challenge in experiment. Meanwhile, machine learning (ML) method can be another approach to search for NTE materials using the existing...
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