Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Heribert A. Graetsch"'
Publikováno v:
Chemistry of Materials. 32:1844-1853
Tetragonal tungsten bronze (TTB), with a flexible chemical framework, is an important class of ferroelectric oxide that hosts both the frequency-independent ferroelectric behavior as well as the br...
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https://explore.openaire.eu/search/publication?articleId=doi_________::d8183402d5d391b56813e65ee786030a
https://doi.org/10.1021/acs.chemmater.9b04122
https://doi.org/10.1021/acs.chemmater.9b04122
Autor:
Heribert A. Graetsch
Publikováno v:
Journal of Chemical Crystallography. 48:177-184
Interatomic distance considerations and site occupancy refinements indicate that Zn2+ is exclusively located on tetrahedral sites in both Z and X-type hexagonal ferrites. Zinc is more strongly enriched in four layer thick spinel blocks of X-type hexa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::267207f27ce90ca137e4a30d26fb240e
https://doi.org/10.1007/s10870-018-0726-2
https://doi.org/10.1007/s10870-018-0726-2
Autor:
Heribert A. Graetsch
Publikováno v:
Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 73:820-826
Quenching of Sr0.52Ba0.48Nb2O6(SBN52) from temperatures above 700°C causes small modifications in the strontium distribution over the large cation sites (Me1 and Me2), changed off-centre shifts of the Nb atoms and slightly increased modulation ampli
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6256fe5e749f61d21f7508ea93500a9
https://doi.org/10.1107/s2052520617007880
https://doi.org/10.1107/s2052520617007880
Autor:
Heribert A. Graetsch
Publikováno v:
Journal of Solid State Chemistry. 246:167-175
The amplitudes of the positional, occupational and adp modulations of sbn mixed crystals are strongly enhanced for high strontium contents. The increase of structural modulations is accompanied by reduced spontaneous electric polarization largely due
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https://explore.openaire.eu/search/publication?articleId=doi_________::c1eb57fe0db3fb91976a4844fad7028d
https://doi.org/10.1016/j.jssc.2016.11.013
https://doi.org/10.1016/j.jssc.2016.11.013
Autor:
Heribert A, Graetsch
Publikováno v:
Acta crystallographica Section B, Structural science, crystal engineering and materials. 73(Pt 5)
Quenching of Sr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::598f9e7158f0b299a94e133bcfc671da
https://pubmed.ncbi.nlm.nih.gov/28980985
https://pubmed.ncbi.nlm.nih.gov/28980985
Publikováno v:
Journal of Solid State Chemistry. 196:255-266
The incommensurately modulated crystal structure of relaxor ferroelectric CBN28 was refined at elevated temperatures up to 330 °C in the 3+2 dimensional superspace group P 4 bm ( αα 1/2,− αα 1/2). The structural modulations mainly consisting o
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https://explore.openaire.eu/search/publication?articleId=doi_________::463026ab4090ebf098aba18dd8dded06
https://doi.org/10.1016/j.jssc.2012.06.028
https://doi.org/10.1016/j.jssc.2012.06.028
Autor:
Heribert A. Graetsch
Publikováno v:
Neues Jahrbuch für Mineralogie - Abhandlungen. 188:111-117
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0da85b9303b790e632a6aa38ad752259
https://doi.org/10.1127/0077-7757/2011/0187
https://doi.org/10.1127/0077-7757/2011/0187
Autor:
Ian S. Buick, Werner Schreyer, Birgit Pöter, Christopher J. Carson, Edward S. Grew, Martin G. Yates, Günter Werding, Geoffrey L. Clarke, Heinz-Jürgen Bernhardt, Heribert A. Graetsch
Publikováno v:
American Mineralogist. 93:283-299
Boralsilite, the only natural anhydrous ternary B 2 O 3 -Al 2 O 3 -SiO 2 (BAS) phase, has been synthesized from BASH gels with Al/Si ratios of 8:1 and 4:1 but variable B 2 O 3 and H 2 O contents at 700–800 °C, 1–4 kbar, close to the conditions e
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https://explore.openaire.eu/search/publication?articleId=doi_________::07bd6221ca3879f60f6754930ba38bf4
https://doi.org/10.2138/am.2008.2571
https://doi.org/10.2138/am.2008.2571
Autor:
Heribert A. Graetsch
Publikováno v:
Zeitschrift für Kristallographie. 222:226-233
Similar to silica tridymite, the corresponding AlPO4 analogue shows a sequence of displacive phase transitions at elevated temperatures. The transformation temperatures are lower than for SiO2 tridymite. The incommensurate structure of the tridymite
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https://explore.openaire.eu/search/publication?articleId=doi_________::9b43f2dabec3b9d3d887261d2c9d48d0
https://doi.org/10.1524/zkri.2007.222.5.226
https://doi.org/10.1524/zkri.2007.222.5.226
Autor:
Heribert A. Graetsch, Michela Brunelli
Publikováno v:
Zeitschrift für Kristallographie - Crystalline Materials. 220:606-613
The crystal structure of the incommensurate modification of SiO2 tridymite existing between 150 and 200 °C was refined in the 3 + 1 dimensional superspace group P21(α β 0) from synchrotron powder diffraction data. The modulation consists of rotati
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https://explore.openaire.eu/search/publication?articleId=doi_________::72533edffb57141b1a52e91ac004eab7
https://doi.org/10.1524/zkri.220.7.606.67104
https://doi.org/10.1524/zkri.220.7.606.67104