Search Results - "Graetsch, H."

Thermally induced structural changes in incommensurate calcium barium niobate Ca0.28Ba0.72Nb2O6 (CBN28) by Graetsch, H.A., Schreuer, J., Burianek, M., Mühlberg, M.

“…The incommensurately modulated crystal structure of relaxor ferroelectric CBN28 was refined at elevated temperatures up to 330°C in the 3+2 dimensional…”
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MICROSTRUCTURE OF FLINT AND OTHER CHERT RAW MATERIALS by GRAETSCH, H. A., GRÜNBERG, J. M.

“…The crystallite size, microstrain, stacking disorder and moganite content of flint and other chert raw materials were studied by X‐ray powder diffraction…”
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Changes of the crystal structure at the relaxor ferroelectric phase transition of strontium barium niobate (SBN53) by Graetsch, H. A.

“…The average crystal structures of the ferroelectric and the intermediate paraelectric phases of SBN53 were refined at various temperatures up to 200 °C from…”
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X-ray powder diffraction study on the modulated high temperature forms of SiO 2 tridymite between 110 and 220 °C by Graetsch, H.

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Large structural modulations in the relaxor ferroelectric and intermediate state of strontium rich members (x>0.6) of the SrxBa1−xNb2O6 (sbn) solid solution series by Graetsch, H.A.

“…The amplitudes of the positional, occupational and adp modulations of sbn mixed crystals are strongly enhanced for high strontium contents. The increase of…”
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NMR, XRD and IR study on microcrystalline opals by GRAETSCH, H, GIES, H, TOPALOVIC, I

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Small angle neutron scattering by opals by Graetsch, H., Ibel, K.

“…Micro- and non-crystalline opals, chalcedony and flint show diffuse small angle neutron scattering (SANS). Precious opals give rise to two additional intensity…”
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Rietveld refinement of synthetic monoclinic NaBSiO4 by Graetsch, Heribert A, Schreyer, Werner

“…A full-pattern X-ray powder-diffraction refinement reveals that NaBSiO4 prepared at 6 GPa and 700DGC crystallizes in space group P21/n with the structure of…”
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Hexagonal high-temperature form of aluminium phosphate tridymite from X-ray powder data by Graetsch, Heribert A.

“…Similar to silica tridymite, AlPO4 tridymite shows a sequence of displacive phase transitions resulting in a dynamically disordered hexagonal high‐temperature…”
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Structure and dynamics of the opal silica-water system by Sosnowska, I., Buchenau, U., Reichenauer, G., Graetsch, H., Ibel, K., Frick, B.

“…Precious opals are built up from closest-packed silica spheres of about 200 nm diameter. The inelastic neutron scattering by ‘wet’ opal sample with 6 wt% water…”
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The nature of water in chalcedony and opal-C from brazilian agate geodes by Graetsch, H., Fl rke, O. W., Miehe, G.

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Structure of strontium barium niobate SrxBa1 − xNb2O6 (SBN) in the composition range 0.32 ≤x≤ 0.82 by Podlozhenov, Sergey, Graetsch, Heribert A., Ulex, Michael, Schneider, Julius, Wöhlecke, Manfred, Betzler, Klaus

“…The structure of strontium barium niobate crystals SrxBa1 − xNb2O6 is comprehensively studied in the whole range of the tetragonal tungsten bronze phase (x =…”
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Structural defects in microcrystalline silica by GRAETSCH, H, FLÖRKE, O. W, MIEHE, G

“…The structure of the microcrystalline silica varieties chalcedony, flint, moganite, opal-C and -CT is characterized by X-ray powder diffractometry and…”
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Crystal structure and growth fabric of length-fast chalcedony by MIEHE, G, GRAETSCH, H, FLOERKE, O. W

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X-ray powder diffraction study on the modulated high temperature forms of SiO2 tridymite between 110 and 220 °C by Graetsch, H

“…The crystal structure of intermediate incommensurate tridymite was refined at 150 °C from powder data. Upon cooling from above 220 °C, the basic structure with…”
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Two forms of aluminium phosphate tridymite from X-ray powder data by Graetsch, Heribert

“…Monoclinic and triclinic (pseudo‐orthorhombic) AlPO4 tridymites have been refined from X‐ray powder diffraction data using the silica analogues as starting…”
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Crystallographic and magnetic investigation on W-type-hexaferrite single crystals in the solid solution series SrZn2-xCoxFe16O27 by Graetsch, H., Haberey, F., Leckebusch, R., Rosenberg, M., Sahl, K.

“…The saturation magnetization and the magnetocrystalline anisotropy were measured on single crystals in the solid solution series SrZn 2-x Co x Fe 16 O 27 (SrZn…”
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Thermally induced structural changes in modulated Ca 0.28 Ba 0.72 Nb 2 O 6 (CBN28) by Graetsch, H. A., Pandey, C. S., Schreuer, J., Burianek, M., Mühlberg, M.

“…Abstract only…”
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Crystallographic and magnetic investigation on W-type-hexaferrite single crystals in the solid solution series SrZn 2-x Co x Fe 16 O 27 by Graetsch, H., Haberey, F., Leckebusch, R., Rosenberg, M., Sahl, K.

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Monoclinic AlPO4 tridymite at 473 and 463 K from X-ray powder data by Graetsch, Heribert A.

“…Upon cooling from its hexagonal high‐temperature modification, AlPO4 (aluminium phosphate) tridymite successively transforms to several displacively distorted…”
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