Heat capacities and thermodynamic functions of CdNb2O6 and CdTa2O6

Ilhan M.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, cilt.147, sa.22, ss.12383-12389, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 147 Sayı: 22
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1007/s10973-022-11490-6
  • Dergi Adı: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.12383-12389
  • Anahtar Kelimeler: CdNb2O6, CdTa2O6, DSC, Heat capacity, Thermodynamic properties, PHOTOLUMINESCENCE PROPERTIES
  • Marmara Üniversitesi Adresli: Evet

Özet

he molar heat capacity parameters of CdNb2O6 and CdTa2O6 oxides, which attracted attention for their promising catalytic and optical properties, were measured between 323 and 1273 K by DSC (differential scanning calorimeter). Heat capacities and thermodynamic functions such as enthalpy increments (H-T degrees - H-298.15 degrees), entropies (S-T degrees), Gibbs energy functions- (G(T)degrees - H-298.15 degrees) T-1 were computed for the temperature range of 298.15-1273 K. The C-p.m degrees (298.15) values of CdNb2O6 and CdTa2O6 oxides were computed as 176.111 J K-1 mol(-1) and 179.650 J K-1 mol(-1), respectively. The fit heat capacities of the oxides showed good agreement with Neumann-Kopp rule (NKR), both at room temperature (C-p.m degrees (298.15)) and the corresponding temperature increase (C-p.m degrees (T)) in the range of 298.5-1000 K.