Page 90 - Chalcogenide Glasses for Infrared Optics

68 Cha pte r T w o

Homogeneous Melt
System Obtained Glass Remarks
Tellurium Compositions
Ti-V-Te Yes at 1600–1700°C No Dense, hard,
crystalline solid
Mn-Ge-Te Yes at 1300°C No Crystalline solid,
metallic appearance
Ni-Zn-Te Yes at 1325°C No Crystalline solid,
metallic appearance
Ni-Ge-Te Yes at 1300°C No Crystalline solid,
metallic appearance
Zn-Ge-Te Yes at 1300°C No Crystalline solid,
metallic appearance
Ti-Ni-Te No at 1500–1600°C — Porous, crystalline
Ti-Si-Te No at 1350°C — Porous, crystalline
Selenium Compositions
Ni-Zn-Se Yes at 1225°C Yes Some infrared
transmission, low
softening point
Mn-Ge-Se Yes at 1300°C Yes Low infrared
transmission,
contains crystallites,
softening point ~
290°C
Zn-Ge-Se Yes at 1200°C Yes Low infrared
transmission,
contains crystallites,
softening point
~310°C
Ni-Ge-Se Yes at 1200°C Yes Two-phase, Ge-
rich glass, Ni-rich
crystalline phase
Ti-V-Se No at 1400°C — Porous, crystalline
Ti-Ge-Se No at 1400°C — Porous, crystalline
Sulfur Compositions
Ni-Ge-S Yes at 1000°C Yes Ge-rich glass on top
of Ni-rich crystalline
phase

TABLE 2.13 Results of Attempting to Compound High-Temperature Chalcogenide
Glasses Using the Closed System Method