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Heat capacities of PbBi12O19(S) and phi-Pb5Bi8O17(S)

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Title Heat capacities of PbBi12O19(S) and phi-Pb5Bi8O17(S)
 
Creator GANESAN, R
VENKATAKRISHNAN, R
ASUVATHRAMAN, R
NAGARAJAN, K
GNANASEKARAN, T
SRINIVASA, RS
 
Subject bismuth-lead-oxide
phi-bi8pb5o17
diffraction
conductivity
temperature
bi8pb5o17
stability
systems
oxygen
pb-bi-o
heat capacity
high temperature x-ray diffraction
electrical conductivity
order-disorder transition
 
Description Heat capacities of PbBi12O19(s) and phi-Pb5Bi8O17(s) were measured by differential scanning calorimetry in the temperature range 280-820 K and 280-660 K, respectively. PbBi12O19(s) and phi-Pb5Bi8O17(s) showed order-disorder transitions whose onset temperatures are 520 K and 700 K, respectively. The measured heat capacities of PbBi12O19(s) and phi-Pb5Bi8O17(s) as a function of temperature are expressed as: C-p < PbBi12O19 > (J K-1 mol(-1)) = 791.68 + 112.18 x 10(-3) T - 13.58 x 10(6) T-2 (280 - 820 K) C-p < phi-Pb5Bi8O17 > (J K-1 mol(-1)) = 700.02 + 161.58 x 10(-3) T - 12.85 x 10(6) T-2 (280 - 660 K) Enthalpy increments, entropies and Gibbs energy functions were derived from the measured heat capacity data. (C) 2005
 
Publisher ELSEVIER SCIENCE BV
 
Date 2011-07-25T05:02:17Z
2011-12-26T12:49:52Z
2011-12-27T05:35:37Z
2011-07-25T05:02:17Z
2011-12-26T12:49:52Z
2011-12-27T05:35:37Z
2005
 
Type Article
 
Identifier THERMOCHIMICA ACTA, 439(1-2), 27-31
0040-6031
http://dx.doi.org/10.1016/j.tca.2005.09.012
http://dspace.library.iitb.ac.in/xmlui/handle/10054/6644
http://hdl.handle.net/10054/6644
 
Language en