P7.1.2.2 - LD DIDACTIC

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P7.1.2.2 LD Physics Leaflets b) Laue diagram at LiF: Tab. 3: Co-ordinates and extended Miller indices of the reflections in the Laue diagram of LiF (*: calculated) x Q mm yQ mm zQ * h k l mm x mm * y mm * 1 14.2 −0.1 7.0 4 0 2 14.7 0.0 0.2 13.3 6.3 0 4 2 00 14.7 −14.2 0.0 7.0 −4 0 2 −14.7 0.0 0.1 −15.2 7.8 0 −4 2 0.0 −14.7 2 10.5 5.0 5.0 4 2 2 11.0 5.5 5.5 10.0 4.9 2 4 2 5.5 11.0 −5.8 10.3 5.2 −2 4 2 −5.5 11.0 −10.5 5.2 5.1 −4 2 2 −11.0 5.5 −11.0 −5.8 5.6 −4 −2 2 −11.0 −5.5 −5.6 −11.5 5.9 −2 −4 2 −5.5 −11.0 5.8 −11.2 5.7 2 −4 2 5.5 −11.0 11.0 −5.5 5.5 4 −2 2 11.0 −5.5 3 8.0 0.0 2.6 6 0 2 8.3 0.0 −0.5 7.2 2.2 0 6 2 0.0 8.3 −9.1 −0.3 3.3 −6 0 2 −8.3 0.0 0.5 −8.0 2.6 0 −6 2 0.0 −8.3 4 7.2 2.0 2.3 6 2 2 7.3 2.4 2.2 6.5 2.0 2 6 2 2.4 7.3 −2.0 7.4 2.4 −2 6 2 −2.4 7.3 −7.0 2.2 2.2 −6 2 2 −7.3 2.4 −7.2 −2.3 2.4 6 −2 2 −7.3 −2.4 −2.2 −7.8 2.7 2 −6 2 −2.4 −7.3 2.7 −7.6 2.6 2 −6 2 2.4 −7.3 7.2 −2.8 2.4 6 −2 2 7.3 −2.4 5 6.0 5.8 2.8 4 4 2 6.3 6.3 −6.0 6.0 2.9 −4 4 2 −6.3 6.3 −6.2 −6.3 3.1 −4 −4 2 −6.3 −6.3 6.5 −6.5 3.3 4 −4 2 6.3 −6.3 6 4.0 3.5 1.2 3 3 1 3.9 3.9 −3.5 3.6 1.1 −3 3 1 −3.9 3.9 −3.8 −4.0 1.3 −3 −3 1 −3.9 −3.9 4.2 −4.0 1.4 3 −3 1 3.9 −3.9 Tab. 4: Spacing of lattice planes d, Bragg angle � and wavelength � associated with the sets of lattice planes of LiF, a 0 = 402.80 pm [1] h k l Results A Laue diagram is a diffraction photograph of a monocrystal taken with a continuous (“white”) spectrum of X-rays. From the continuum of the X-rays only those wavelengths (cf. Tables 2 and 4) contribute to the diffraction pattern taken on a plane film which fulfil the Bragg condition for a particular set of lattice planes. The symmetry of the Laue diagrams is in accordance with the cubic structure of the NaCl and the LiF crystal. Literature d pm [1]Handbook of Chemistry and Physics, 52nd Edition (1971− 72), The Chemical Rubber Company, Cleveland, Ohio, USA. � � pm 4 0 2 90.1 26.6� 80.6 4 2 2 82.2 24.1� 67.1 6 0 2 63.7 18.4� 40.3 6 2 2 60.7 17.5� 36.5 4 4 2 67.1 19.5� 44.8 3 3 1 92.4 13.3� 42.5 LD DIDACTIC GmbH ⋅ Leyboldstrasse 1 ⋅ D-50354 Hürth ⋅ Phone (02233) 604-0 ⋅ Telefax (02233) 604-222 ⋅ E-mail: info@ld-didactic.de © by LD DIDACTIC GmbH Printed in the Federal Republic of Germany Technical alterations reserved
LD Physics Leaflets P7.1.2.2 Addendum 1: The larger film 554 896 enables the recording of larger images, which provide more resolution, but also require a bit more exposure time. Hint: To reduce the black area in the middle, caused by the direct beam, glue a 3x3 mm piece of the lead foil from an already opened film sheet in front of the film during exposure. Addendum 2: The crystals 554 87 and 554 88 are usually delivered on a glass plate 25 x 25 x 1 mm. This plate is glass, not the crystal.
Page 1 and 2: 0808-Ste Solid-state physics Proper
Page 3 and 4: LD Physics Leaflets P7.1.2.2 Fig. 5
Page 5: LD Physics Leaflets P7.1.2.2 Measur

P7.1.2.2 - LD DIDACTIC

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