Absolute Measurement of X-Ray Scattering Factors of Copper

Yamagishi, Tomoe

doi:10.1143/jpsj.21.2638

Cited by 24 publications

(7 citation statements)

References 14 publications

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“…The agreement between the first powder measurement performed by Batterman, Chipman & DeMarco (1961) and our recent ?-ray results is surprisingly good for small values of sin 0/2, although the quoted experimental error in the powder data is rather large. On the contrary, the later powder measurements performed by Hosoya & Yamagishi (1966) and by Temkin, Henrich & Raccah (1972) clearly disagree with our ?-ray data. It is also very interesting to note that for small values of sin 0/2 the ?-ray results are in very good agreement with early measurements performed by Jennings, Chipman & DeMarco (1964) on perfect Cu crystals.…”

Section: Comparison With Earlier X-ray Experimentscontrasting

confidence: 69%

A charge density study of copper by γ-ray diffractometry on imperfect single crystals

Schneider¹,

Hansen²,

Kretschmer³

1981

Acta Cryst Sect A

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Section: Comparison With Earlier X-ray Experimentscontrasting

confidence: 69%

A charge density study of copper by γ-ray diffractometry on imperfect single crystals

Schneider¹,

Hansen²,

Kretschmer³

1981

Acta Cryst Sect A

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“…Temperature factors did not alter excessively between the various anisotropic refinements, but the mean value of u =0.0064(2) A z is appreciably smaller than values obtained from X and y-ray measurements (Battermann, Chipman & DeMarco, 1961;Jennings, Chipman & DeMarco, 1964;Hosoya & Yamagishi, 1966;Temkin, Henrich & Raccah, 1972;Freund, 1973Freund, , 1975aSchneider, 1976), where the mean value is 0.0072(3) •z. This clearly indicates the need for corrections for thermal diffuse scattering.…”

Section: Discussionmentioning

confidence: 62%

Extinction in deformed copper single crystals. A combined study by γ-ray diffractometry and neutron structure refinement

Lehmann¹,

Schneider²

1977

Acta Cryst Sect A

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Neutron diffraction and v-ray rocking-curve measurements were performed on plastically deformed single crystals of Cu in order to compare the mosaic distribution parameters obtained from least-squares structural refinement with those seen by the y-diffractometer. Neutron data were collected at two wavelengths (2=0"538 and 0.741 A) for one crystal with very homogeneous mosaic distribution, and for another crystal with less good but more typical mosaic structure data were collected for 2 = 0"538 A. Maximum sin 0/2 was 1.52 A-1 and maximum extinction correction was less than 30%. For the latter crystal no comparison could be made between the two sets of observed distribution parameters because of the uneven mosaic distribution. The former crystal was found from the v-ray measurements to be bent, but when this was taken into consideration in the Coppens-Hamilton [Acta Cryst. (1970), A26, 71-83] formalism for anisotropic extinction correction good agreement was found between mosaic parameters obtained by v-ray and neutron measurements for directions not affected by the crystal curvature, whereas the structure refinement did not, as expected, reflect the complete crystal curvature when this effect was dominant.

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“…The (222) and (333), as well as the (220) atomic scattering factors are, however, considered to be reliable within the limits determined by the uncertainties in the correction for the thermal motion of the atoms. In Table 1 our results are summarized and compared with the results of earlier work by Batterman, Chipman & DeMarco (1961), Jennings, Chipman & DeMarco (1964, Hosoya & Yamagishi (1966), Tempkin, Henrich & Raccah (1972), and Freund (1973.…”

Section: =23°0 Au~mentioning

confidence: 96%

Absolute structure-factor measurements in imperfect single crystals by means of γ-ray diffractometry

Schneider¹

1976

J Appl Cryst

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An experimental method of measuring absolute structure factors in imperfect single crystals by means of Bragg diffraction of 0.03 A y-radiation is presented. It is shown that in principle atomic scattering factorscan be deduced with an accuracy of about +0 5jo from rocking curves measured by means of y-ray diffractometry. Due to the uncertainties in the correction for thermal motion of the atoms, however, the values of the atomic scattering factors of copper at the 220, 222 and 333 reflexions could be derived only with an accuracy of _+ 1%. The measurements were made at room temperature.

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Absolute Measurement of X-Ray Scattering Factors of Copper

Cited by 24 publications

References 14 publications

A charge density study of copper by γ-ray diffractometry on imperfect single crystals

A charge density study of copper by γ-ray diffractometry on imperfect single crystals

Extinction in deformed copper single crystals. A combined study by γ-ray diffractometry and neutron structure refinement

Absolute structure-factor measurements in imperfect single crystals by means of γ-ray diffractometry

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