Abstract
The temperature-dependent specific electrical conductivity of polycrystalline, polymorphic NH4I samples was measured in the temperature range between −170°C and +25°C. The conductivity in the ranges of the tetragonal →CsCl-type and CsCl-type→NaCl type transformations can be explained by the formal kinetics of a diffusion-controlled nucleation and growth process. An estimation of the activation energy of the formation of the second-and first-phase nuclei in the respective parent phases by the evaluation of TTT curves yielded energy values of 0.004–0.05 and 0.0001–0.024 eV.
Резюме
Злектрическая проводимость, специфически зависяшая от температуры поликристалического и полиморфного образца NH4I была измерена в температурном интервале от −170°C до +25°C. Проводимость при переходах типа тетрагонального рCsCl и CsCl→NaCl можно обьяснить формальной кинетикой процессов возрастания и застроения под диффузионным контролом. Знергии активации образования ядер вторичной и первчной фаз в соотвестствушей исходной фазе определяется приближенно. Оцениваются TTT кривые, из которых значения знергии 0,004–0,05 и 0,001–0,024 зв соответственно.
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Dedicated to Prof.I. Tarján on his 60th birthday.
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Morlin, Z. Kinetics of the low-temperature phase transformation of ammonium iodide. Acta Physica 33, 377–385 (1973). https://doi.org/10.1007/BF03158073
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DOI: https://doi.org/10.1007/BF03158073