Thermomechanical detwinning of superconducting YBa2Cu3O7−x single crystals

1989 ◽  
Vol 4 (4) ◽  
pp. 745-747 ◽  
Author(s):  
Debra L. Kaiser ◽  
Frank W. Gayle ◽  
Robert S. Roth ◽  
Lydon J. Swartzendruber
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Determination ◽  
Complete Removal ◽  
Crystal Structure Determination ◽  
Layered Perovskite ◽  
Anisotropy Of Properties ◽  
Perovskite Type

A method for the complete removal of twins from single crystals of superconducting YBa2Cu3O7−x is described. The process depends on ferroelastic behavior found to exist in the phase, and should be generally applicable to the layered perovskite-type phases containing accommodation twins resulting from a tetragonal-to-orthorhombic transformation on cooling. The twin-free, superconducting single crystals will enable investigation of a–b anisotropy of properties as well as crystal structure determination without complication by the presence of microtwins.

scholarly journals The crystal structure of alstonite, BaCa(CO3)2: an extraordinary example of ‘hidden’ complex twinning in large single crystals

2020 ◽  
Vol 84 (5) ◽  
pp. 699-704
Author(s):  
Luca Bindi ◽  
Andrew C. Roberts ◽  
Cristian Biagioni
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Determination ◽  
Unit Cell ◽  
Crystal Structure Determination ◽  
Unit Cell Parameters ◽  
Space Group ◽  
Cell Parameters ◽  
Structure Determinations

AbstractAlstonite, BaCa(CO3)2, is a mineral described almost two centuries ago. It is widespread in Nature and forms magnificent cm-sized crystals. Notwithstanding, its crystal structure was still unknown. Here, we report the crystal-structure determination of the mineral and discuss it in relationship to other polymorphs of BaCa(CO3)2. Alstonite is trigonal, space group P31m, with unit-cell parameters a = 17.4360(6), c = 6.1295(2) Å, V = 1613.80(9) Å3 and Z = 12. The crystal structure was solved and refined to R1 = 0.0727 on the basis of 4515 reflections with Fo > 4σ(Fo) and 195 refined parameters. Alstonite is formed by the alternation, along c, of Ba-dominant and Ca-dominant layers, separated by CO3 groups parallel to {0001}. The main take-home message is to show that not all structure determinations of minerals/compounds can be solved routinely. Some crystals, even large ones displaying excellent diffraction quality, can be twinned in complex ways, thus making their study a crystallographic challenge.

Die Kristallstruktur von [Na4(OSiPh3)4(H2O)3] / The Crystal Structure of [Na4(OSiPh3)4(H2O)3]

1996 ◽  
Vol 51 (11) ◽  
pp. 1583-1586 ◽  
Author(s):  
A. Mommertza ◽  
K. Dehnickea ◽  
J. Magull
Keyword(s):  
Crystal Structure ◽  
Ir Spectroscopy ◽  
Single Crystals ◽  
Coordination Number ◽  
Structure Determination ◽  
Title Compound ◽  
Saturated Solution ◽  
Crystal Structure Determination ◽  
Humid Atmosphere ◽  
Space Group

Colourless single crystals of the title compound are obtained from a saturated solution of NaOSiPh3 in toluene in a humid atmosphere. We have characterized [Na4(OSiPh3)H2O)3] by IR spectroscopy and by a crystal structure determination. Space group R3, Z = 6 , R = 0.056. Lattice dimensions at -70°C: a = b = 1540.3 pm, c = 2639.6 pm. The compound has the structure of a Na4O4 heterocubane which is only slighty distorted and in which one of the sodium atoms is not hydrated and shows coordination number three.

Die Kristallstruktur von [YbCl2(THF)5]+[WOCl4(THF)]- / Crystal Structure of [YbCl2(THF)5]+[WOCl4(THF)]-

1999 ◽  
Vol 54 (12) ◽  
pp. 1609-1610 ◽  
Author(s):  
M. Karl ◽  
G. Seybert ◽  
W. Massa ◽  
K. Dehnicke
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Chlorine Atoms ◽  
Space Group ◽  
X Ray ◽  
Ytterbium Atom ◽  
Moisture Sensitive ◽  
Tungsten Hexachloride

Blue moisture sensitive single crystals of [YbCl2(THF)5]+[WOCl4(THF)]- were obtained as a by-product from the reaction of the ytterbium trisamide Yb[N(SiMe3)2]3 with tungsten hexachloride in THF solution. The crystals were suitable for an X-ray crystal structure determination. Space group P2/c, Z = 2, lattice dimensions at -80 °C: a = 1192.5(1), b = 1117.1(1), c = 1349.9(1) pm, ß = 104.115(7)°, R = 0.0424. The structure consists of cations [YbCl2(THF)5]+ in which the ytterbium atom is coordinated in a pentagonalbipyramidal way by the chlorine atoms in the axial positions and by the oxygen atoms of the THF molecules in equatorial positions. Counterions are the well-known [WOCl4(THF)]- ions.

Convenient crystal growth, structural determination and magnetic studies of layered copper hydroxides containing aromatic sulfonates

CrystEngComm ◽  
2015 ◽  
Vol 17 (47) ◽  
pp. 9193-9202 ◽  
Author(s):  
Wataru Fujita
Keyword(s):  
Crystal Structure ◽  
Crystal Growth ◽  
Single Crystals ◽  
Structure Determination ◽  
Magnetic Measurements ◽  
Crystal Structure Determination ◽  
Structural Determination ◽  
Magnetic Studies ◽  
Aromatic Sulfonates ◽  
Hydrolysis Of

Single crystals of layered copper hydroxides containing some organic sulfonate anions were obtained by hydrolysis of acetate. Crystal structure determination and magnetic measurements of these materials were carried out.

Single-crystal Structure Determination and Spectroscopic Characterization of KSr4(BO3)3

2013 ◽  
Vol 68 (4) ◽  
pp. 338-344 ◽  
Author(s):  
Gerhard Sohr ◽  
Doris Clara ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Structure Determination ◽  
Normal Pressure ◽  
Spectroscopic Characterization ◽  
Single Crystal Structure ◽  
Crystal Structure Determination ◽  
Raman Spectroscopic ◽  
Pressure Phase

During attempts to synthesize a high-pressure phase of KSr4(BO3)3 using pressures of up to 12 GPa, single crystals of the normal-pressure phase KSr4(BO3)3 with sufficient quality for singlecrystal diffraction experiments could be obtained at 3 GPa and 1300 °C in a Walker-type multianvil apparatus. The single-crystal structure determination verified the published powder diffraction data of KSr4(BO3)3 revealing the non-centrosymmetric space group Ama2 with a = 1104:8(2), b=1199:1(2), c=688:8(2) pm and Z =4. Additionally, IR- and Raman-spectroscopic investigations were performed on single crystals of the compound.

Complete X-ray single-crystal structure determination and Raman spectrum of NH4[C(CN)3]

2017 ◽  
Vol 72 (7) ◽  
pp. 517-521
Author(s):  
Olaf Reckeweg ◽  
Armin Schulz ◽  
Francis J. DiSalvo
Keyword(s):  
Crystal Structure ◽  
Raman Spectrum ◽  
Single Crystal ◽  
Single Crystals ◽  
Structure Determination ◽  
Title Compound ◽  
Single Crystal Structure ◽  
Crystal Structure Determination ◽  
X Ray ◽  
Related Compounds

AbstractThe crystal structure of NH4[C(CN)3] has been determined via X-ray single-crystal methods at 203(2) K corroborating earlier results. Additionally, the hydrogen positions have been determined and the Raman spectrum of the title compound recorded on single crystals. The spectroscopic results are compared to those for related compounds.

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