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Three Phases of Basic Zirconium and Hafnium Hydroxohalides
James A Sommers1, Jenn M Amador1, Lauren B Fullmer1
1Department of Chemistry, Oregon State University, Corvallis, Oregon 97331-4003, United States.
Zirconium and hafnium halide solutions form dense glasses upon evaporation. These glasses and related crystalline solids can be described by a single formula, M(OH)4-αXα·(4α - 1)H2O, revealing structural and water content changes.
Area of Science:
- Materials Science
- Inorganic Chemistry
- Glass Science
Background:
- Aqueous solutions of zirconium and hafnium halides form glasses on evaporation.
- The atomic ratio α = X/M influences glass properties.
Purpose of the Study:
- To describe the preparation and properties of zirconium and hafnium halide glasses.
- To investigate crystal-glass equilibria and chemical formulas for related solids.
- To understand the role of hydroxide and water content in these materials.
Main Methods:
- Evaporation of aqueous solutions of zirconium and hafnium halides.
- Small- and wide-angle X-ray scattering (SWAXS) for structural analysis.
- Characterization of crystalline and glassy solids, including doped glasses.
Main Results:
- Increased polymerization observed in glasses as α decreases from 2 to 1.
- Glasses are denser than their crystalline counterparts.
- A unified chemical formula, M(OH)4-αXα·(4α - 1)H2O, describes crystalline and glassy hydroxohalides.
- Water content and hydrogen bonding patterns vary with α.
- Eu3+-doped glass shows asymmetric dopant sites via photoluminescence.
Conclusions:
- The parameter α effectively describes the composition and structure of zirconium and hafnium hydroxohalides.
- Hydroxide substitution for halide influences hydrogen bonding and water content.
- These glasses offer potential for applications requiring specific optical properties.
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