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35 citations found for Calvert,

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Acta Cryst. (1981). A37, C314
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Acta Cryst. (1981). A37, C343-C344
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The X-ray attenuation coefficient of carbon at [lambda](Cu K[alpha]1) has been measured with a specimen of highly oriented pyrolytic graphite, tilted to average inhomogeneities and change the beam path length. The values determined are [mu](Cu K[alpha]1) = 9.246 (5) cm-1 and [mu]/Q (Cu K[alpha]1) = 4.080 (2) cm2 g-1. For Cu K{\bar \alpha}, the derived value is 4.089 (2) cm2 g-1 and this differs significantly from the latest value, 4.219 cm2 g-1 given in Vol. IV of International Tables for X-ray Crystallography.

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Acta Cryst. (1984). A40, C198
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By the use of Cu K[alpha]1 plane-polarized X-rays, the intensity of the beam transmitted through a plate of highly oriented pyrolytic graphite is measured as the plate is tilted ([omega]) relative to the beam. The resultant transmitted-beam absorption pattern (TBAP), expressed as effective attenuation coefficient, [mu]', versus [omega], is interpreted in relation to the turbostratic structure of pyrolytic graphite. The TBAP, [mu]' versus [omega], is complementary to the diffraction pattern, presented as log I versus 2[theta]. Potential uses of the TBAP are discussed.

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Acta Cryst. (1993). A49, c443-c444
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Acta Cryst. (1981). A37, C161
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A simple modification of the jig proposed by the IUCr Commission on Crystallographic Apparatus for the measurement of polarization ratios for X-rays allowing the full rotation of the detector arm permits cancellation of the first-order errors by averaging pairs of measurements differing by 180° around the rotation axis of the detector arm. The plot of Imeas as a function of cos2 [Phi], where [Phi] is the angle between the detector arm and one of the principal directions of polarization in the beam gives a reliable value of the polarization ratio K. The experimental results are: Mo K[alpha] 0.969 ± 3, 0.970 ± 3; Cu K[alpha] 0.908 ± 5, 0.897 ± 5 for a 0.42° and a 0.60° FWHM graphite monochromator respectively.


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X-ray powder diffraction data are reported for the phases Eu5Sb3, Eu11Sb10, Eu2Sb3, Eu5Bi3, Eu4Bi3 and Eu11Bi10.

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