Optical and thermal properties of P2O5-Na2O-CaO-Al2O3:CoO glasses doped with transition metals

Colak S., Aral E.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.509, sa.15, ss.4935-4939, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 509 Sayı: 15
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jallcom.2011.01.172
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.4935-4939
  • Anahtar Kelimeler: Oxide glasses, Optical properties, Thermal conductivity, Solar collectors, ZINC PHOSPHATE-GLASSES, LOW SOFTENING POINT, OXIDE GLASSES, BAND-GAP, SPECTROSCOPIC ELLIPSOMETRY, CONDUCTIVITY, FILMS, LEAD
  • Eskişehir Osmangazi Üniversitesi Adresli: Evet

Özet

The aim of this paper is to report the optical and thermal properties of V2O5 and CuO doped P2O5-Na2O-CaO-Al2O3: CoO glasses so as to investigate their possible use in solar collection applications. The optical absorption spectra of the glasses at room temperature were in the spectral range of 200-1100 nm. The optical band gaps of the glass samples were determined for direct and indirect transitions. When transition metal ions doped to the base glass, the optical band gap decreased. Changes in the refractive indices vs. wavelength for all the specimens were also examined by spectroscopic ellipsometry. By measuring the heat capacities and thermal diffusion coefficients of the specimens at varying temperatures, their thermal conductivities were calculated to be in the 320-620K temperature range. The obtained glasses seem to be promising materials and can be used in solar collector applications. (C) 2011 Elsevier B. V. All rights reserved.