Abstract
Crystals of the Sr1 − xCexF2 + x compositions close to the congruent one (x ∼ 0.3) are fabricated by the vertical directional crystallization. It is shown that the use of CF4 to form a fluorinating atmosphere during growth leads to additional spurious absorption in the crystals in the range 350–600 nm. The use of PbF2 and ZnF2 for fluorination makes it possible to obtain colorless Sr1 − xCexF2 + x crystals of the desired optical quality from melt. The thermal conductivity of crystal with x ∼ 0.28 in the temperature range 80-500 K lies within 1.50 ± 0.03 W m−1 K−1. High ionic conductivity makes the Sr1 − xCexF2 + x crystals promising for application in solid-state ionics.
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