Densified low-hygroscopic form of P2O5 glass

P2O5 compound is an archetypical glass-forming oxide with a record-high hygroscopicity, which makes both the study and potential industrial uses of the glass extremely difficult. We found that the quenching from the P2O5 melt under ultrahigh pressures enables obtaining densified P2O5 glasses with a residual densification up to 12% at normal conditions. These glasses have a low hygroscopicity and can exist under air conditions for several weeks. An examination of the structure of the new form of P2O5 glass reveals a significant increase in neighbors of terminal oxygen atoms in the second coordination sphere and a cardinal decrease of the volume of nanovoids in the glassy matrix. The research on the physical properties of a non-hygroscopic form of P2O5 glass will possibly allow it to be used for the synthesis of new phosphate glasses and their applications.

[1]  D. Price,et al.  Intermediate-range order in permanently densified GeO2 glass. , 2003, Physical review letters.

[2]  A. Hannon,et al.  The P-O bond lengths in vitreous probed by neutron diffraction with high real-space resolution , 1998 .

[3]  Rino,et al.  Structural transformation in densified silica glass: A molecular-dynamics study. , 1994, Physical review. B, Condensed matter.

[4]  Price,et al.  Intermediate-range order in permanently densified vitreous SiO2: A neutron-diffraction and molecular-dynamics study. , 1991, Physical review. B, Condensed matter.

[5]  Marvin J. Weber,et al.  Science and technology of laser glass , 1990 .

[6]  H. Hosono,et al.  Large Enhancement of Electrical Conductivity in Magnesium Phosphate Glasses by Ion Implantation of Proton , 1996 .

[7]  P. Jóvári,et al.  A new version of the RMC++ Reverse Monte Carlo programme, aimed at investigating the structure of covalent glasses , 2007 .

[8]  J. Neuefeind,et al.  The structure of vitreous P2O5 studied by high-energy X-ray diffraction , 2000 .

[9]  Richard K. Brow,et al.  Review: the structure of simple phosphate glasses , 2000 .

[10]  U. Hoppe.  A refined reverse Monte Carlo analysis of the structure of vitreous P2O5 , 2000 .

[11]  V. Brazhkin,et al.  Toroid type high-pressure device: history and prospects , 2004 .

[12]  F. L. Galeener,et al.  The Raman spectra and structure of pure vitreous P2O5 , 1979 .

[13]  S. Kohara,et al.  Intermediate-range order in vitreous SiO2 and GeO2 , 2005 .

[14]  G. Hoatson,et al.  Modelling one‐ and two‐dimensional solid‐state NMR spectra , 2002 .

[15]  Steve W. Martin,et al.  Structure of vitreous P2O5 and alkali phosphate glasses , 1998 .

[16]  R. O. Jones,et al.  Structural phase transitions on the nanoscale: The crucial pattern in the phase-change materials Ge2Sb2Te5 and GeTe , 2007 .

[17]  C. Benmore,et al.  Network rigidity in GeSe2 glass at high pressure. , 2008, Physical review letters.

[18]  T. Ishikawa,et al.  High-energy X-ray diffraction beamline: BL04B2 at SPring-8 , 2001 .