Anisotropic structure of alkali metaphosphate glasses

Seiji Inaba, Yasuhiko Benino, Shinji Kohara, Hideo Hosono, Setsuro Ito

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Orientation anisotropy, which is well known in organic polymers with appropriate network structures, is less common in oxide glasses. We present the intermediate-range order in anisotropic alkali metaphosphate glass which consists of oriented PO4 tetrahedral chains and intervening alkali cations along the elongation direction. The X-ray total structure factor S(Q) indicates that the inter-chain spacing depends on the size of alkali cations and varies from 5.03 to 6.28 Å. The mixed alkali effect is primarily related to an increase of the separation. The total correlation function T(r) provides the first definite evidence that the anisotropic structure is composed of phosphorus-bridging oxygen bonds (P–OB) lying along the elongation direction and phosphorus-non-bridging oxygen bonds (P–OT) oriented perpendicular to the elongation direction. The present result unveils fundamental aspects of the anisotropic structure of an oxide glass and provides essential information for the development of oxide glasses to control structural anisotropy.

Original languageEnglish
Pages (from-to)3631-3641
Number of pages11
JournalJournal of the American Ceramic Society
Issue number6
Publication statusPublished - Jun 1 2020


  • anisotropy
  • glass
  • mixed alkali effect
  • structure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


Dive into the research topics of 'Anisotropic structure of alkali metaphosphate glasses'. Together they form a unique fingerprint.

Cite this