Die Optik der Edelopale

Baier, Ernst

doi:10.1524/zkri.1932.81.1.183

Cited by 4 publications

(2 citation statements)

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“…Kastner et al, 1977;Lynne & Campbell, 2003). Baier (1932) was the first to attribute the iridescent colors of opals to a periodic microstructure, but it was only later that electron microscope investigations confirmed a regular arrangement of close-packed spheres in precious opals (Jones et al, 1964). Small-angle neutron scattering was used to quantify the range of sizes of the spherules that is related to their distinctive play of color .…”

Section: Introductionmentioning

confidence: 99%

Ordering of water in opals with different microstructures

Eckert¹,

Gourdon²,

Jacob³

et al. 2015

ejm

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Opal has long fascinated scientists. It is one of the few minerals with an amorphous structure, and yet, compared to silica glass, it is highly organized on the mesoscale. By means of inelastic neutron scattering (INS), we could document that in four samples of opal at low temperature an ice-like structure of water is present, with details depending on microstructural characteristics. While FTIR spectra for all samples are nearly identical and thus not very informative, INS shows clear differences, highlighting the significance of microstructures. Neutron diffraction at 100 K on one of the opal samples provides evidence for crystalline cubic ice.

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Section: Introductionmentioning

confidence: 99%

Ordering of water in opals with different microstructures

Eckert¹,

Gourdon²,

Jacob³

et al. 2015

ejm

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show abstract

“…Similarly, other authors carried out XRPD investigations on opals and did not identify any lines on the films or, at best, identified only some weak interferences (Kerr, 1924). Even Baier (1932), into his long article about the optical properties of opals, underlined that it was not possible to observe any crystalline phases through XRPD analyses of opals.…”

Section: Introductionmentioning

confidence: 99%

XRPD patterns of opals: A brief review and new results from recent studies

2010

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A new classification of opals through X-ray powder diffraction (XRPD) methodology, by analysing 75 new samples of opal came from different worldwide areas, is introduced. A brief historical summary of the application of XRPD analysis on opals and the most important XRPD results reported in literature were compared with the newly obtained XRPD data. A simple method for the classification of opals on the basis of their degrees of structural order-disorder calculated from the diffraction data is proposed. In addition, a clear boundary, which has not been previously described by others in literature, related to the presence (or absence) of two-peak characteristic of the cristobalite phase is identified. This boundary allows for a discrimination of opals C from CT.

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Strukturbedingte Eigenschaften

Zwikker

1942

Technische Physik Der Werkstoffe

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Die Optik der Edelopale

Cited by 4 publications

References 0 publications

Ordering of water in opals with different microstructures

Ordering of water in opals with different microstructures

XRPD patterns of opals: A brief review and new results from recent studies

Strukturbedingte Eigenschaften

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