prov:value
| - These include (1) the heavy metal halide glasses based on zirconium, hafnium, indium, zinc, and other heavy metals, (2) chalcogenide materials, in particular those based on sulfides of the 3rd and 4th group elements of the periodic table, and (3) low-phonon alkali-metal halide crystals such as NaCl, KCl, KBr, CsBr, and CsI.
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