✦ LIBER ✦

Density, Colourability and Conductivity of Sr2+ Doped KCl Crystals

✍ Scribed by M. Debes; J. Kowalczyk

Publisher: John Wiley and Sons
Year: 1972
Tongue: English
Weight: 262 KB
Volume: 7
Category: Article
ISSN: 0232-1300
DOI: 10.1002/crat.19720071113

No coin nor oath required. For personal study only.

✦ Synopsis

The measurements of colourability and density changes in KCI crystals with different Sr2+ contents point to the presence of two separate doping ranges in which different mechanisms of Sr2+ incorporation aro active. Below 350 ppm Sr/KC1 substitutional incorporation and above 350 ppm Sr/KCI precipitation of a second phase predominates. The latter process is accompanied by the formation of larger vacancy clusters. Ionic conductivity moasuremerits imply that in the range bet - ween 80 and 350 ppm tho aggregation of Sr2+ 1 3 dipols takes place.

Aus Messungen der Verfarbbarkeit und Dichteanderung an KCI-Kristallexi mit unterschiedlichem Srz+-Gehalt wird auf zwei getrennte Dotierungsbereiche geschlossen, fur die unterschiedliche Sr2+-Einbaumechanismen wirksam sind. Unterhalb von 350 ppm Sr/KC1 tritt substitutioneller Einbau auf, oberhalb von 350 ppm Sr/KC1 ergeben sich bevorzugt Ausscheidungen in einer zweiten Phase. Dieser Ausschei -dungsprozeJ3 ist mit der Bildung grol3erer Lesrstellencluster vcrbunden. Aus Messungeri der Ionenleitfahigkeit kann auf dio Aggregation von Sr2+ @ Dipolen im Bereich von 80 bis 350 ppm Sr/KCI geschlossen werden.

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