Behaviour of the fundamental absorption edge of sodium nitrate near the lambda transition

Experimental investigation and thermodynamic evaluation of the CsNO3-LiNO3-NaNO3 ternary system

“…On the other hand, Kawashima et al [186] noticed that the λ-transition temperature (Tλ) is the most difficult point to be controlled by the thermal control system, because the heat capacity shows anomalous temperature dependence at Tλ. From these observations and paying more attention to the data obtained by chemical analysis and all other methods, it is worthy to consider the transition temperature higher than 547 K in agreement with the data from all other calorimetry methods.…”

“…Many works devoted to the solid-solid transition of NaNO3 seem to substantiate the second-order transition [32,67,93,130,132,136,155,186,199] with enthalpy equal to zero.…”