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NaCdZn 2 F 7 pyrochlore (Fd3¯m, Z=8), in which the Na and Cd cations are completely disordered, is shown to be structurally stable in the temperature range 100–643K using X-ray diffraction and Raman scattering at atmospheric pressure. X-ray single-crystal measurements indicate that the (Na, Cd)F 8 cubes become more regular, while the ZnF 6 octahedra become more distorted...
Single wall carbon nanotubes with diameter 0.4 nm grown in the channels of AlPO 4 -5 crystals were studied by Raman spectroscopy. Up to 21 different laser lines were used to characterize vibrational properties. Spectra depend strongly on the energy of the laser line used for excitation. It was found that only two types of nanotubes with different chiralities, (5,0) and (4,2), are responsible...
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