Precipitation dynamics in Mg-doped LiF at low annealing temperatures

Guckelberger, K.; Kimber, R.M.

doi:10.1016/0038-1098(74)90794-7

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Neumaier (1969) and Guckelsberger and Kimber (1974) using low-temperature thermal conductivity methods concluded that precipitation can occur in the lowly doped LiF/MgF2 system (1: 240 mole ppm Mgz+) after ageing for only two hours at temperatures as low as 75 "C. The second stage of the ageing curve (see figure 6) has, however, been interpreted by Cook and Dryden (1962) as being due to the formation of higher-order clusters such as pentamers. The first stage in figure 6 is probably due to the formation of trimers, but this stage is not observed at the higher ageing temperatures (figures 3-5) because it occurs too rapidly to be measured.…”

Section: 2 Ageing Experimentsmentioning

confidence: 99%

Effect of solution treatment temperature and ageing on TLD-100 crystals (ionic conduction measurement)

Bradbury¹,

Lilley²

1977

J. Phys. D: Appl. Phys.

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A study of the influence of holding TLD-100 crystals at different solution temperatures, between 210 "C and 470 "C, on the thermoluminescent glow curve has revealed no effect. The ageing of TLD-100 crystals at 177 "C, 150 "C, 131 "C and 102 "C as followed by ionic conductivity measurements has shown that GLiF . MgFz precipitates in all cases. This strongly reduces the thermoluminescent response.(3 "C 11-1) leads to the precipitation of 6LiF. MgFz in the LiF matrix. For the particular composition of TLD-100 (estimated to be N 170 mole ppm Mg2+ ions) the solubility limit of the precipitated phase is 250 "C. Above this temperature the Mgz+ ions are all in solid solution; but, because of coulombic interactions, there is a tendency for thc Mg2+ ions and cation vacancies to form nearest neighbour pairs and higher-order clusters (see, for example, Dryden and Shuter 1973, Strutt and Lilley 197G). With increasing the crystal.

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Section: 2 Ageing Experimentsmentioning

confidence: 99%

Effect of solution treatment temperature and ageing on TLD-100 crystals (ionic conduction measurement)

Bradbury¹,

Lilley²

1977

J. Phys. D: Appl. Phys.

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Structural aspects of clustering reactions in alkali halides doped with divalent impurities

Strutt

Lilley

1976

Phys. Stat. Sol. (a)

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A detailed mechanism for the clustering of divalent impurity–cation vacancy dipoles in alkali halide single crystals is developed to extend the dimer‐trimer mechanism proposed by Crawford. In the extended model the geometry of dimer and trimer configurations and the Suzuki precipitate structure (6 MX · NX2) are considered in conjunction with the electrostatic constraints to cluster formation. A number of parallel reaction paths leading to distinct cluster configurations are examined. Only one path appears to lead to the nucleation of precipitates of Suzuki phase. The kinetic equations for the initial decay of dipoles in the extended model reduce to three limiting cases and are compared with experimentally observed rate laws.

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