Ordering of water in opals with different microstructures
EUROPEAN JOURNAL OF MINERALOGY, cilt.27, sa.2, ss.203-213, 2015 (SCI-Expanded, Scopus)
- 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
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- 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.