Effects of magnetic field on the gel growth of PbBr2

Kaito, Takamasa; Yanagiya, Shin-ichiro; Mori, Ayumi; Kurumada, Mami; Kaito, Chihiro; Inoue, Takeshi

doi:10.1016/j.jcrysgro.2005.11.014

Cited by 9 publications

(25 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that ∆n here is defined as ∆n = n − n ⊥ with the optic axis being parallel ( ) to the direction of the magnetic field. Figure 2 Scanning measurement was performed at 31 points for each sample to determine the dynamic component of the ensemble-averaged dynamic structure factor ∆g (1) en (τ ) [13]. The determined correlation function was transformed to the distribution function of relaxation time, P (τ R ), numerically transformed to relaxationtime distribution composed of one or two logarithmic Gaussian distribution (LGD) [14].…”

Section: Methods Of Birefringence Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Structural anisotropy of silica hydrogels prepared under magnetic field

2008

Self Cite

View full text Add to dashboard Cite

Birefringence measurements have been carried out on the Pb-doped silica hydrogels prepared under various magnetic fields up to 5T. The silica gels prepared at 5T were used as a medium of crystal growth of PbBr2, whose result implied the structural anisotropy; an aligned array of crystallites was obtained by transmission electron microscopy. While the samples prepared at 0, 1, and 3T have no birefringence, we found that the samples have negative birefringence on the order of magnitude 10 −6 as if the direction of the magnetic field is the optic axis of a uniaxal crystal. To the authors' knowledge, the birefringent silica hydrogels were obtained by gelation under magnetic field for the first time. Also, scanning microscopic light scattering experiments have been performed. The results indicate that the characteristic length distribution for birefringent samples is narrower than that for non-birefringent ones.

show abstract

Section: Methods Of Birefringence Measurementmentioning

confidence: 99%

“…We have found an aligned array of crystallites in gels prepared under a magnetic field of 5T, which was used as media of the crystal growth of PbBr 2 [1,2]. The crystallites were aligned with their crystallographic axis along the direction of the magnetic field, which was applied during the preparation of the gels.…”

Section: Introductionmentioning

confidence: 95%

Structural anisotropy of silica hydrogels prepared under magnetic field

2008

Self Cite

View full text Add to dashboard Cite

show abstract

“…At first, 50 g sodium metasilicate (Na 2 SiO 3 ·9H 2 O) was resolved in 103 mL distilled water as described in a previous paper [19]. Then, 8 mL of this solution was diluted with 8 mL distilled water.…”

Section: Methodsmentioning

confidence: 99%

“…In 2006, we grew lead (II) bromide (PbBr 2 ) crystals using silica hydrogels as media of a crystal growth [19,20]. The silica gels were made from sodium metasilicate (Na 2 SiO 3 ) aqueous solution by adding a concentrated acetic acid solution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

Kaito¹,

Mori²,

Kaito³

2015

JCCE

View full text Add to dashboard Cite

In a previous study, structure of silica gels prepared in a high magnetic field was investigated. While a direct application of such anisotropic silica gels is for an optical anisotropic medium possessing chemical resistance, we show here their possibility of medium in materials processing. In this direction, for example, silica hydrogels have so far been used as media of crystal growth. In this paper, as opposed to the soft-wet state, dried silica gels have been investigated. We have found that lead (II) nanocrystallites were formed induced by electron irradiation to lead (II)-doped dried silica gels prepared in a high magnetic field such as B = 10 T. Hydrogels made from a sodium metasilicate solution doped with lead (II) acetate were prepared. The dried specimens were irradiated by electrons in a transmission electron microscope environment. Electron diffraction patterns indicated the crystallinity of lead (II) nanocrystallites depending on B. An advantage of this processing technique is that the crystallinity can be controlled through the strength of magnetic field B applied during gel preparation. Specific skills are not required to control the strength of magnetic field.

show abstract

Morphology of Crystals Grown from Solutions

Abbona

Aquilano

2010

Springer Handbook of Crystal Growth

View full text Add to dashboard Cite

Effects of magnetic field on the gel growth of PbBr2

Cited by 9 publications

References 6 publications

Structural anisotropy of silica hydrogels prepared under magnetic field

Structural anisotropy of silica hydrogels prepared under magnetic field

Electron-Irradiation Induced Nanocrystallization of Pb(II) in Silica Gels Prepared in High Magnetic Field

Morphology of Crystals Grown from Solutions

Contact Info

Product

Resources

About