TY - JOUR
T1 - Ordering process in sodium nitrite observed by using neutron diffractometry
AU - Mashiyama, Hiroyuki
AU - Miyoshi, Tatsuki
AU - Asahi, Takanao
AU - Kasano, Hironobu
AU - Noda, Yukio
AU - Kimura, Hiroyuki
PY - 2011/9/15
Y1 - 2011/9/15
N2 - From neutron diffraction data, the nuclear density of sodium nitrite is estimated directly by using a maximum entropy method and is compared with the results of usual least-squares calculations. The obtained nuclear density shows that the disordered NO2 molecule becomes partially ordered in the ferroelectric phase at temperatures just below the transition temperature. However, the density distribution cannot be explained by using a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.
AB - From neutron diffraction data, the nuclear density of sodium nitrite is estimated directly by using a maximum entropy method and is compared with the results of usual least-squares calculations. The obtained nuclear density shows that the disordered NO2 molecule becomes partially ordered in the ferroelectric phase at temperatures just below the transition temperature. However, the density distribution cannot be explained by using a two-Gaussian function, which suggests that the ordering is not a classical stochastic process but a quantum tunneling in a double minima local potential.
KW - Ferroelectrics
KW - Neutron diffractometry
KW - Order-disorder transition
KW - Sodium nitrite
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U2 - 10.3938/jkps.59.2515
DO - 10.3938/jkps.59.2515
M3 - Article
AN - SCOPUS:80052834745
VL - 59
SP - 2515
EP - 2518
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 31
ER -