Hydrothermal Crystal Growth and Crystal Structures of the Mercury(II) Chromates(VI) α-HgCrO4, β-HgCrO4, and HgCrO4×H2O.

ChemInform ◽  
2006 ◽  
Vol 37 (35) ◽  
Author(s):  
Berthold Stoeger ◽  
Matthias Weil
Keyword(s):  
Crystal Growth ◽  
Crystal Structures ◽  
Hydrothermal Crystal Growth

Hydrothermal Crystal Growth and Crystal Structures of the Mercury(II) Chromates(VI) α-HgCrO4, β-HgCrO4, and HgCrO4·H2O

2006 ◽  
Vol 61 (6) ◽  
pp. 708-714 ◽  
Author(s):  
Berthold Stöger ◽  
Matthias Weil
Keyword(s):  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystals ◽  
Crystal Structures ◽  
Chromic Acid ◽  
Structure Type ◽  
Data Sets ◽  
Hydrothermal Conditions ◽  
Hydrothermal Crystal Growth ◽  
Structure Factors

Single crystals of α-HgCrO4, β -HgCrO4 and HgCrO4 ・ H2O were obtained by reacting yellow HgO in chromic acid of various concentrations under hydrothermal conditions at 200 °C (4 d). All crystal structures were solved and refined from single crystal diffractometer data sets [α-HgCrO4: P21/n, Z = 4, a = 5.5079(8), b = 8.5266(12), c = 7.3503(10) Å , β = 94.022(3)°, 955 structure factors, R[F2 > 2σ (F2)] = 0.0296; β -HgCrO4: Cmcm, Z = 4, a = 5.7187(9), b = 9.0169(14), c = 7.0114(11) Å, 361 structure factors, R[F2 > 2σ (F2)] = 0.0275; HgCrO4 ・ H2O: P1̅, Z = 2, a=5.6157(15), b =6.1115(16), c= 7.590(2) Å , α =108.850(5), β =91.666(5), γ =116.569(5)°, 1235 structure factors, R[F2 > 2σ (F2)] = 0.0316]. The previously reported structure of α-HgCrO4 has been re-determined. It contains distorted [HgO7] pentagonal bipyramids in which the short bonds are directed towards the apices. The new polymorph β -HgCrO4 adopts the CrVO4 (β -CrPO4) structure type and is composed of slightly distorted [HgO6] octahedra. The previously unknown monohydrate HgCrO4 ・ H2O crystallizes in an unique structure and is composed of one nearly regular [HgO4(H2O)2] octahedron and one considerably distorted [HgO6] octahedron. All three structures contain tetrahedral chromate anions CrO42− as the second building units with average Cr-O distances of ca. 1.65 Å

Crystal Structures of Tetragonal NdPc2O and NdPc2Clx,O1-x Obtained from NdPc2H by Anodic Crystal Growth

1988 ◽  
Vol 156 (1) ◽  
pp. 247-256 ◽  
Author(s):  
Mireille Mossoyan-deneux ◽  
David Benlian ◽  
Andre Baldy ◽  
Marcel Pierrot
Keyword(s):  
Crystal Growth ◽  
Crystal Structures

Hydrothermal crystal growth of perovskite-type fluorides

1981 ◽  
Vol 16 (3) ◽  
pp. 813-816 ◽  
Author(s):  
Shigeyuki S¯omiya ◽  
Shin -Ichi Hirano ◽  
Masahiro Yoshimura ◽  
Kazumichi Yanagisawa
Keyword(s):  
Crystal Growth ◽  
Hydrothermal Crystal Growth ◽  
Perovskite Type

Hydrothermal Crystal Growth on Non-native Substrates: The Case of UO2

2021 ◽  
Author(s):  
Karl Rickert ◽  
Michael A. Velez ◽  
Timothy A. Prusnick ◽  
David B. Turner ◽  
Martin M. Kimani ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Hydrothermal Crystal Growth

Hydrothermal Crystal Growth of Mixed Valence Cs2SbBr6

2019 ◽  
Vol 19 (7) ◽  
pp. 4090-4094 ◽  
Author(s):  
Victoria E. Combs ◽  
Iain W. H. Oswald ◽  
James R. Neilson
Keyword(s):  
Crystal Growth ◽  
Mixed Valence ◽  
Hydrothermal Crystal Growth
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