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At least 469 records · Page 26

Magneto-optical properties of biogenic photonic crystals in algae

In the present study, the effects of strong static magnetic fields on the structural colors of the cell covering crystals on a microalgae, coccolithophore, were investigated. The coccolithophore, Emiliania huxleyi, generates a precise assembly of calcite crystals called coccoliths by biomineralization. The coccoliths attached to the cells exhibited structural colors under side light illumination, and the colors underwent dynamic transitions when the magnetic fields were changed between 0 T and 5 T, probably due to diamagnetically induced changes of their inclination under the magnetic fields. The specific light-scattering property of individual coccoliths separated from the cells was also observed. Light scattering from a condensed suspension of coccoliths drastically decreased when magnetic fields of more than 4 T were applied parallel to the direction of observation. The magnetically aligned cell-covering crystals of the coccolithophores exhibited the properties of both a photonic crystal and a minimum micromirror.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗

Materials Data on Eu(AlGa)2 by Materials Project

EuAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Eu–Ga bond lengths are 3.31 Å. All Eu–Al bond lengths are 3.50 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Eu, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.51 Å. All Ga–Al bond lengths are 2.63 Å. Al is bonded to four equivalent Eu and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing AlEu4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Ce(AlGa)2 by Materials Project

CeGa2Al2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ce is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Ce–Ga bond lengths are 3.21 Å. All Ce–Al bond lengths are 3.50 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Ce, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.50 Å. All Ga–Al bond lengths are 2.61 Å. Al is bonded to four equivalent Ce and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing AlCe4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Nd(AlGa)2 by Materials Project

NdAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Nd is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Nd–Ga bond lengths are 3.24 Å. All Nd–Al bond lengths are 3.51 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Nd, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.51 Å. All Ga–Al bond lengths are 2.62 Å. Al is bonded to four equivalent Nd and four equivalent Ga atoms to form a mixture of distorted face, edge, and corner-sharing AlNd4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on La(AlGa)2 by Materials Project

LaAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. La is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All La–Ga bond lengths are 3.29 Å. All La–Al bond lengths are 3.52 Å. Ga is bonded in a 9-coordinate geometry to four equivalent La, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.56 Å. All Ga–Al bond lengths are 2.63 Å. Al is bonded to four equivalent La and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing AlLa4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Pr(AlGa)2 by Materials Project

PrAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Pr is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Pr–Ga bond lengths are 3.26 Å. All Pr–Al bond lengths are 3.51 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Pr, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.52 Å. All Ga–Al bond lengths are 2.62 Å. Al is bonded to four equivalent Pr and four equivalent Ga atoms to form a mixture of distorted edge, face, and corner-sharing AlPr4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Yb(AlGa)2 by Materials Project

YbAl2Ga2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Yb is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Yb–Ga bond lengths are 3.25 Å. All Yb–Al bond lengths are 3.46 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Yb, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.46 Å. All Ga–Al bond lengths are 2.60 Å. Al is bonded to four equivalent Yb and four equivalent Ga atoms to form a mixture of distorted face, edge, and corner-sharing AlYb4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Ca(AlGa)2 by Materials Project

Ca(GaAl)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ca is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Ca–Ga bond lengths are 3.28 Å. All Ca–Al bond lengths are 3.49 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Ca, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.49 Å. All Ga–Al bond lengths are 2.62 Å. Al is bonded to four equivalent Ca and four equivalent Ga atoms to form a mixture of distorted edge, face, and corner-sharing AlCa4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Ba(AlGa)2 by Materials Project

Ba(GaAl)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ba is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Ba–Ga bond lengths are 3.49 Å. All Ba–Al bond lengths are 3.62 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Ba, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.75 Å. All Ga–Al bond lengths are 2.69 Å. Al is bonded to four equivalent Ba and four equivalent Ga atoms to form a mixture of distorted corner, edge, and face-sharing AlBa4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on Sr(AlGa)2 by Materials Project

Sr(GaAl)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Sr is bonded in a 8-coordinate geometry to eight equivalent Ga and eight equivalent Al atoms. All Sr–Ga bond lengths are 3.38 Å. All Sr–Al bond lengths are 3.54 Å. Ga is bonded in a 9-coordinate geometry to four equivalent Sr, one Ga, and four equivalent Al atoms. The Ga–Ga bond length is 2.59 Å. All Ga–Al bond lengths are 2.66 Å. Al is bonded to four equivalent Sr and four equivalent Ga atoms to form a mixture of distorted edge, face, and corner-sharing AlSr4Ga4 tetrahedra.

36 MATERIALS SCIENCE↗