TY - JOUR
T1 - Analysis of structural phase transition of Nd2NiO 4 + δ by scanning thermal measurement under controlled oxygen partial pressure
AU - Niwa, E.
AU - Nakamura, T.
AU - Mizusaki, J.
AU - Hashimoto, T.
N1 - Funding Information:
This study was financially supported by the “Strategic Research Base Development” Program for Private Universities subsidized by MEXT (2009) and by Nihon University Strategic Projects for Academic Research “Nanotechnology Excellence Nanomaterial based Photonic and Quantum Technologies.”
PY - 2011/8/20
Y1 - 2011/8/20
N2 - The dependence of the structural phase transition behavior of Nd 2NiO4 + δ between the tetragonal and orthorhombic phases on the oxygen partial pressure, P(O2), has been investigated by differential scanning calorimetry, DSC, and thermogravimetry and differential thermal analysis, TG-DTA. The structural phase transition temperature, T P, decreased with decreasing P(O2), while the variations of enthalpy, ΔH, entropy, ΔS, estimated from the peak area of DSC signals and oxygen content at the phase transition, Δδ, determined from TG curves, exhibited little dependence on P(O2). From the relationship between Tp and P(O2), the variations of standard enthalpy, ΔH°, and entropy, ΔS°, at the phase transition have been evaluated. By considering Δδ, ΔH° and ΔS° exhibited fair agreement with ΔH and ΔS evaluated by DSC.
AB - The dependence of the structural phase transition behavior of Nd 2NiO4 + δ between the tetragonal and orthorhombic phases on the oxygen partial pressure, P(O2), has been investigated by differential scanning calorimetry, DSC, and thermogravimetry and differential thermal analysis, TG-DTA. The structural phase transition temperature, T P, decreased with decreasing P(O2), while the variations of enthalpy, ΔH, entropy, ΔS, estimated from the peak area of DSC signals and oxygen content at the phase transition, Δδ, determined from TG curves, exhibited little dependence on P(O2). From the relationship between Tp and P(O2), the variations of standard enthalpy, ΔH°, and entropy, ΔS°, at the phase transition have been evaluated. By considering Δδ, ΔH° and ΔS° exhibited fair agreement with ΔH and ΔS evaluated by DSC.
UR - http://www.scopus.com/inward/record.url?scp=80051587271&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80051587271&partnerID=8YFLogxK
U2 - 10.1016/j.tca.2011.04.031
DO - 10.1016/j.tca.2011.04.031
M3 - Article
AN - SCOPUS:80051587271
SN - 0040-6031
VL - 523
SP - 46
EP - 50
JO - Thermochimica Acta
JF - Thermochimica Acta
IS - 1-2
ER -