Study of phase transition in a [CdHgI4:0.2AgI] mixed conducting composite system doped with KI and K2SO4


Noorussaba N., Ahmad A., ÖZÇELİK B.

PHASE TRANSITIONS, cilt.84, ss.960-971, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 84
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1080/01411594.2011.598278
  • Dergi Adı: PHASE TRANSITIONS
  • Sayfa Sayıları: ss.960-971

Özet

New composite superionic systems, [CdHgI4: 0.2AgI]:0.xKI and [CdHgI4:0.2AgI]:0.xK(2)SO(4) (x = 0.2, 0.4, 0.6 mol. wt%), were prepared, using [CdHgI4 : 0.2AgI] mixed composite system as the host. Electrical conductivity was measured to study the transition behavior at frequencies of 100 Hz, 120 Hz, 1 kHz, and 10 kHz in the temperature range from 150 degrees C to 250 degrees C using a GENRAD 1659 RLC Digibridge. A sharp increase in conductivity was observed during beta -> alpha phase transition. Upon increasing the dopant-to-host ratio, the conductivity of the superionic systems exhibited Arrhenius (thermally activated)type behavior. Differential thermal analysis, differential scanning calorimetry, thermogravimetric analysis, and X-ray powder diffraction were performed to confirm the doping effect and transition in the host. The phase transition temperature increased with an increase in the dopant concentration. Activation energies in eV for pre- and post-transition phase behavior are reported.

New composite superionic systems, [CdHgI4: 0.2AgI]:0.xKI and [CdHgI4:0.2AgI]:0.xK(2)SO(4) (x = 0.2, 0.4, 0.6 mol. wt%), were prepared, using [CdHgI4 : 0.2AgI] mixed composite system as the host. Electrical conductivity was measured to study the transition behavior at frequencies of 100 Hz, 120 Hz, 1 kHz, and 10 kHz in the temperature range from 150 degrees C to 250 degrees C using a GENRAD 1659 RLC Digibridge. A sharp increase in conductivity was observed during beta -> alpha phase transition. Upon increasing the dopant-to-host ratio, the conductivity of the superionic systems exhibited Arrhenius (thermally activated)type behavior. Differential thermal analysis, differential scanning calorimetry, thermogravimetric analysis, and X-ray powder diffraction were performed to confirm the doping effect and transition in the host. The phase transition temperature increased with an increase in the dopant concentration. Activation energies in eV for pre- and post-transition phase behavior are reported