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Jaeger, Herbert; Rambo, Matthew; Klueg, Robert E.

doi:10.1023/a:1020518723287

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…• Cd:H & other Cd:dopant pairs in Si [109][110][111] Highly disordered materials Nb [90] Cu-Hf [92,93] • ZnO [88] • GaP [89] ZrSiO 4 [91] Defect and Diffusion Forum Vol. 311…”

Section: Discussionmentioning

confidence: 99%

“…However, it has been shown that care must be taken when drawing conclusions regarding disorder throughout a sample based on the PAC signal. For example, two types of environments of Hf probes were observed in metamict zircon: (1) a moderately defective crystalline environment and (2) a nearly, if not completely, amorphous environment [91]. Annealing resulted in an increase of the site fraction of probes found in the crystalline environment and a decrease of the site fraction of probes found in the amorphous environment; however, the fraction of probes in the crystalline environment was smaller than what was expected based on the volume fractions of the two environments determined using conventional X-ray diffraction (XRD).…”

Section: Defects and Diffusion Studied Using Pac Spectroscopymentioning

confidence: 99%

“…Annealing resulted in an increase of the site fraction of probes found in the crystalline environment and a decrease of the site fraction of probes found in the amorphous environment; however, the fraction of probes in the crystalline environment was smaller than what was expected based on the volume fractions of the two environments determined using conventional X-ray diffraction (XRD). The discrepancy was attributed to the difference in length scales probed by PAC and by XRD [91].…”

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confidence: 99%

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Perturbed Angular Correlation Spectroscopy – A Tool for the Study of Defects and Diffusion at the Atomic Scale

Zacate

Jaeger

2011

DDF

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Abstract. This paper provides an introduction to perturbed angular correlation (PAC) spectroscopy in the context of its application in the study of point defects and diffusion. It emphasizes what we anticipate to be of interest to non-PAC specialists who are interested in understanding variations in how PAC results are presented by different research groups and in how physical quantities such as defect formation energies, association energies, and migration barriers can be extracted from analysis of PAC spectra. Numerous citations are included to emphasize the universality of the analysis methods across different classes of materials including metallic, ceramic, and semiconducting compounds.

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“…• Cd:H & other Cd:dopant pairs in Si [109][110][111] Highly disordered materials Nb [90] Cu-Hf [92,93] • ZnO [88] • GaP [89] ZrSiO 4 [91] Defect and Diffusion Forum Vol. 311…”

Section: Discussionmentioning

confidence: 99%

Section: Defects and Diffusion Studied Using Pac Spectroscopymentioning

confidence: 99%

mentioning

confidence: 99%

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Perturbed Angular Correlation Spectroscopy – A Tool for the Study of Defects and Diffusion at the Atomic Scale

Zacate

Jaeger

2011

DDF

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“…During the transition the SiYO bond lengths increase which in turn affects the ZrYO coordination. We have used time-differential perturbed angular correlation spectroscopy (PAC) to characterize zircons with varying degree of metamictization [5], however none of this work shows any evidence for a change in the ZrYO coordination. Recently we began working with zircons from the Mud Tank carbonatite in central Australia.…”

Section: Introductionmentioning

confidence: 99%

Perturbed Angular Correlation Study of Naturally Occurring Zircon with very Small Impurity Concentrations

2004

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We used 181 Ta-PAC spectroscopy to characterize the electric field gradient at Zr sites of zircon samples from the Harts Range in Australia. Zircons from this region contain very low levels of radioactive impurities. The PAC spectra between room temperature and 1100-C are axially symmetric and show little damping. The quadrupole frequency decreases linearly with increasing temperature, and the slope of the n Q vs. T graph increases above 900-C. This is attributed to a rearrangement of the SiYO coordination, which affects the ZrYO coordination. The spectra of all zircons show a distinct decrease of the anisotropy between 800 and 600-C. This behavior is also seen with samples that do not exhibit the change in slope in the n Q vs. T data. We believe that the decrease in the anisotropy is due to an aftereffect following the -decay of 181 Hf.

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