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V Correcher J Garcia-Guinea FJ Valle-Fuentes 《Journal of Thermal Analysis and Calorimetry》2006,83(2):439-444
In
this paper, novel results on the blue thermally stimulated luminescence (TSL)
emission of ulexite (NaCaB5O6(OH)6·5H2O)
have been studied. The four maxima appearing at 60, 110, 200 and 240°C
on the TSL glow curves of this borate could be respectively associated to:
(i) the first dehydration (NaCaB5O6(OH)6·5H2O→NaCaB5O6(OH)6·3H2O),
(ii) the creation-annihilation of the three-hydrated
phase, (iii) the Na-coordinated chains
dehydroxylation and the starting point of the alkali self-diffusion through
the lattice and (iv) the amorphisation
of the lattice. These results are fairly well correlated with the differential
thermal analyses (DTA), in situ thermal observations under environmental scanning
electron microscope (TESEM) and thermal X-ray diffraction (TXRD) techniques. 相似文献
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Frederick J. Lakner Alexander Kiselyov Alexandre V. Ivachtchenko 《Tetrahedron letters》2005,46(32):5325-5328
Novel mesoionic heterocyclic structures 8 have been obtained via the internal cyclization of thio- and amino-acid derivatives of 6-azauracil 7b-d. These compounds undergo ring-opening reactions with amines to yield the respective 6-azauracil amides (9) in good yields under microwave irradiation. 相似文献
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