Birefringence of silica hydrogels prepared under high magnetic fields reinvestigated
| Autor: | Mori, Atsushi, Kaito, Takamasa, Furukawa, Hidemitsu, Yamato, Masafumi, Takahashi, Kohki |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Material Research Express, Vol. 1, No4, 045202 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/2053-1591/1/4/045202 |
| Popis: | Birefringence is an indicator of structural anisotropy of materials. We measured the birefringence of Pb(II)-doped silica hydrogels prepared under a high magnetic field of various strengths. Because the silica is diamagnetic, one does not expect the structural anisotropy induced by a magnetic field. In previous work [Mori A, Kaito T, Furukawa H 2008 Mater. Lett. 62 3459-3461], we prepared samples in cylindrical cells made of borosilicate glass and obtained a preliminary result indicating a negative birefringence for samples prepared at 5T with the direction of the magnetic field being the optic axis. We have measured the birefringence of Pn(II)-doped silica hydrogels prepared in square cross-sectional cells made of quartz and reverted the previous conclusion. Interestingly, the magnetic-influenced silica hydrogels measured have been classified into four classes: two positive birefringent ones, no birefringent one, and negative birefringent one. Proportionality between birefringence and the strength of magnetic field is seen for the former two. Comment: 15 pages, 4 figures; Materials Research Express, accepted |
| Databáze: | arXiv |
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