Ordering of water in opals with different microstructures

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Eckert J., Gourdon O., Jacob D. E., Meral Ç., Monteiro P. J., Vogel S. C., ...Daha Fazla

EUROPEAN JOURNAL OF MINERALOGY, cilt.27, sa.2, ss.203-213, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 2
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1127/ejm/2015/0027-2428
  • Dergi Adı: EUROPEAN JOURNAL OF MINERALOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.203-213
  • Anahtar Kelimeler: opal, water, TEM, inelastic neutron scattering, neutron diffraction, FTIR, NEUTRON-SCATTERING, VIBRATIONAL-SPECTRA, SILANOL GROUPS, ICE, DYNAMICS, CRYSTALLINE, TEMPERATURE, MINERALS, MODELS, SITES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Opal has long fascinated scientists. It is one of the few minerals with an amorphous structure, and yet, compared to silica glass, it is highly organized on the mesoscale. By means of inelastic neutron scattering (INS), we could document that in four samples of opal at low temperature an ice-like structure of water is present, with details depending on microstructural characteristics. While FTIR spectra for all samples are nearly identical and thus not very informative, INS shows clear differences, highlighting the significance of microstructures. Neutron diffraction at 100 K on one of the opal samples provides evidence for crystalline cubic ice.