Self-diffusion in liquid metals
| Autor: | Norman H. Nachtrieb |
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| Rok vydání: | 1967 |
| Předmět: | |
| Zdroj: | Advances in Physics. 16:309-323 |
| ISSN: | 1460-6976 0001-8732 |
| DOI: | 10.1080/00018736700101425 |
| Popis: | A survey is made of all published data on self-diffusion in liquid metals and an examination is carried out on the temperature-dependence of D for studies covering a wide range of temperatures. Log D versus 1/T and D versus T represent the best data equally well, while D versus T 1/2 and D versus T 2 do not. The proper functional form is taken to be D=CT experimentally, and a simple free diffusion theory is developed from the standpoint of vibrational atom motion. An equation having no adjustable parameters results (D=k 2 ϑ D T/hk), in which κ is the vibrational force constant. Values calculated for D at the melting point are in good agreement with experimental values for potassium, sodium, copper and silver, but are below the measured values for lead, indium, zinc and tin. |
| Databáze: | OpenAIRE |
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