Incubation time of etch pits at dislocation outcrops

Lin, Changjian; Shen, Pouyan

doi:10.1016/0016-7037(95)00187-5

Cited by 6 publications

(4 citation statements)

References 41 publications

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“…In the present case, the dissolution inhibitor is likely Fe 2+ (both in lattice and solution) because it is the major cation impurity in the present apatite. This is similar to the case of willemite 55, 56. However, it is known that CaF 2 is slightly soluble in strong acid.…”

Section: Discussionsupporting

confidence: 55%

Directional/acidic dissolution kinetics of (OH,F,Cl)‐bearing apatite

Tseng

Lin

Shen

et al. 2005

J Biomedical Materials Res

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Directional dissolution of a natural (OH,F,Cl)-bearing apatite has been studied at various solution pH values (0-3) and 30 degrees C. This apatite showed abnormally high O--H stretching frequencies due to the substitution of Cl for OH. The advance of dissolution front indicated that steady-state directional dissolution for pH = 0-2 followed an apparent rate law of Rate = ka(H+) (n) (in mole/m(2)h), where the rate constants (k) are 2.15 and 1.61; and the rate orders (n) are 1.44 and 1.30 for [0001] and <1,120> directions, respectively. Previous study, however, indicated a smaller n value (n = 0.55-0.70) for fluorapatite powders at higher pHs. A nonlinear pH dependence of logarithmic dissolution rate at a wide pH range implied that the surface active sites and/or rate-determining steps have changed when the acidity of solution and/or the composition of the apatite were changed. The opening of etch pits on basal planes further indicated that the dissolution rates along the three principal directions have the following relationship: [0001] > <1,120> > <1,010> for pH=0-1, but the order was reversed for pH > 3.

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Section: Discussionsupporting

confidence: 55%

Directional/acidic dissolution kinetics of (OH,F,Cl)‐bearing apatite

Tseng

Lin

Shen

et al. 2005

J Biomedical Materials Res

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“…Dissolution of willemite single crystal at low pH indicated that impurities inherent in nature or added deliberately to the etching solution, affect the incubation time of etch pit formation at dislocation outcrops. 2 This was rationalized by the varied poisoning effect on dislocation outcrops, in particular Fe 2+ to maintain near-surface undersaturation of willemite, as essential to nucleate etch pits. 2 As for thermal etching of willemite at 1250 • C, i.e.…”

Section: Dislocation Exposure and The Formation Of Thermal Etch Pits mentioning

confidence: 99%

“…2 This was rationalized by the varied poisoning effect on dislocation outcrops, in particular Fe 2+ to maintain near-surface undersaturation of willemite, as essential to nucleate etch pits. 2 As for thermal etching of willemite at 1250 • C, i.e. homologous temperature T/T m = 0.85 (where T m is the congruent melting temperature 1512 • C of willemite), such impurities were suggested to segregate to dislocation outcrops both via lattice diffusion and viscous flow during surface premelting.…”

Section: Dislocation Exposure and The Formation Of Thermal Etch Pits mentioning

confidence: 99%

“…1 The dissolution inhibitors, either inherent from natural minerals or added on purpose in solution, tend to accumulate at dislocation outcrops and maintain the near-surface undersaturation of willemite, thus allowing etch pits to develop at these high energy sites on (0 0 0 1) surface. 2 These inhibitors can also cause etch hillocks in areas away from dislocation * Corresponding author. Tel.…”

Section: Introductionmentioning

confidence: 99%

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