Stability and P-V-T equation of state of KAISi 3 O 8 -hollandite determined by in situ X-ray observations and implications for dynamics of subducted continental crust material

In situ X-ray diffraction measurements of KAlSi3O8 -hollandite (K-hollandite) were performed at pressures of 15-27 GPa and temperatures of 300-1,800 K using a Kawai-type apparatus. Unit-cell volumes obtained at various pressure and temperature condition