Characterization of a high pressure, high temperature modification of ammonia borane (BH3NH3)

2013 ◽  
Vol 139 (5) ◽  
pp. 054507 ◽  
Author(s):  
Johanna Nylén ◽  
Lars Eriksson ◽  
Daryn Benson ◽  
Ulrich Häussermann
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Ammonia Borane ◽  
Temperature Modification ◽  
High Pressure High Temperature ◽  
High Temperature Modification

Structure of a new high-pressure–high-temperature modification of antimony(III) oxide, γ-Sb2O3, from high-resolution synchrotron powder diffraction data

2012 ◽  
Vol 68 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Denis Orosel ◽  
Robert E. Dinnebier ◽  
Vladislav A. Blatov ◽  
Martin Jansen
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
High Resolution ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Powder Diffraction Data ◽  
Temperature Modification ◽  
Synchrotron Powder Diffraction ◽  
High Pressure High Temperature ◽  
High Temperature Modification

A quenchable new high-pressure–high-temperature modification of antimony(III) oxide, γ-Sb2O3, has been obtained at hydrostatic pressures of 9–11 GPa and temperatures of 573–773 K. Its crystal structure has been determined from high-resolution synchrotron powder diffraction data. γ-Sb2O3 consists of three-dimensionally cross-linked infinite chains of SbO3 E units (E = lone pair) with the chains forming tetragonal rod-packing. The underlying topology of γ-Sb2O3 (3,3T8) is found very rarely in inorganic structures; it is realised only for the polyanion [Si4O4N6]10− that occurs in the Ce4(Si4O4N6)O structure type. The structural relation to the two previously known polymorphs of Sb2O3 at ambient pressure, valentinite and senarmontite is discussed.

The High-temperature Modification of LuAgSn and High-pressure High-temperature Experiments on DyAgSn, HoAgSn, and YbAgSn

2008 ◽  
Vol 63 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Birgit Heying ◽  
Ute Ch. Rodewald ◽  
Gunter Heymann ◽  
Wilfried Hermes ◽  
Falko M. Schappacher ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Room Temperature ◽  
Magnetic Ordering ◽  
Two Dimensional ◽  
Arc Melting ◽  
Temperature Modification ◽  
High Pressure High Temperature ◽  
High Temperature Modification ◽  
Related Phase

The high-temperature modification of LuAgSn was obtained by arc-melting an equiatomic mixture of the elements followed by quenching the melt on a water-cooled copper crucible. HT-LuAgSn crystallizes with the NdPtSb-type structure, space group P63mc: a = 463.5(1), c = 723.2(1) pm, wR2 = 0.0270, 151 F2, and 11 variables. The silver and tin atoms build up two-dimensional, puckered [Ag3Sn3] networks (276 pm Ag-Sn) that are charge-balanced and separated by the lutetium atoms. The Ag-Sn distances between the [Ag3Sn3] layers of 294 pm are much longer. Single crystals of isotypic DyAgSn (a = 468.3(1), c = 734.4(1) pm, wR2 = 0.0343, 411 F2, and 11 variables) and HoAgSn (a = 467.2(1), c = 731.7(2) pm, wR2 = 0.0318, 330 F2, and 11 variables) were obtained from arc-melted samples. Under high-pressure (up to 12.2 GPa) and high-temperature (up to 1470 K) conditions, no transitions to a ZrNiAl-related phase have been observed for DyAgSn, HoAgSn, and YbAgSn. HT-TmAgSn shows Curie-Weiss paramagnetism with μeff = 7.53(1) μB/Tm atom and θP = −15.0(5) K. No magnetic ordering was evident down to 3 K. HT-LuAgSn is a Pauli paramagnet. Room-temperature 119Sn Mössbauer spectra of HT-TmAgSn and HT-LuAgSn show singlet resonances with isomer shifts of 1.78(1) and 1.72(1) mm/s, respectively

ChemInform Abstract: The High-Temperature Modification of LuAgSn and High-Pressure High-Temperature Experiments on DyAgSn, HoAgSn, and YbAgSn.

ChemInform ◽  
2008 ◽  
Vol 39 (16) ◽  
Author(s):  
Birgit Heying ◽  
Ute Ch. Rodewald ◽  
Gunter Heymann ◽  
Wilfried Hermes ◽  
Falko M. Schappacher ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Temperature Modification ◽  
High Pressure High Temperature ◽  
High Temperature Modification

scholarly journals Multianvil High-Pressure/High-Temperature Synthesis and Characterization of multiferroic HP-Co3TeO6

2021 ◽  
Author(s):  
Gunter Heymann ◽  
Elisabeth Selb ◽  
Toni Buttlar ◽  
Oliver Janka ◽  
Martina Tribus ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Type Structure ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Space Group ◽  
Crystal System ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

By high-pressure/high-temperature multianvil synthesis a new high-pressure (HP) phase of Co3TeO6 was obtained. The compound crystallizes in the acentric trigonal crystal system of the Ni3TeO6-type structure with space group R3...

scholarly journals High-pressure synthesis and characterization of the non-centrosymmetric scandium borate ScB6O9(OH)3

2020 ◽  
Vol 75 (6-7) ◽  
pp. 597-603
Author(s):  
Birgit Fuchs ◽  
Hubert Huppertz
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Structure Solution ◽  
Temperature Experiment ◽  
Pressure Synthesis

AbstractThe non-centrosymmetric scandium borate ScB6O9(OH)3 was obtained through a high-pressure/high-temperature experiment at 6 GPa and 1473 K. Single-crystal X-ray diffraction revealed that the structure is isotypic to InB6O9(OH)3 containing borate triple layers separated by scandium layers. The compound crystallizes in the space group Fdd2 with the lattice parameters a = 38.935(4), b = 4.4136(4), and c = 7.6342(6) Å. Powder X-ray diffraction and vibrational spectroscopy were used to further characterize the compound and verify the proposed structure solution.

Structural characterization of the high-temperature modification of the Cu2ZnGeTe4quaternary semiconductor compound

2016 ◽  
Vol 253 (6) ◽  
pp. 1195-1201 ◽  
Author(s):  
L. Nieves ◽  
G. E. Delgado ◽  
G. Marcano ◽  
Ch. Power ◽  
S. A. López-Rivera ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Characterization ◽  
Semiconductor Compound ◽  
Temperature Modification ◽  
High Temperature Modification

scholarly journals High-Pressure, High-Temperature Synthesis and Characterization of Polar and Magnetic LuCrWO6

2020 ◽  
Vol 59 (6) ◽  
pp. 3579-3584
Author(s):  
Sun Woo Kim ◽  
Xiaoyan Tan ◽  
Corey E. Frank ◽  
Zheng Deng ◽  
Huaiyu Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
High Pressure High Temperature

High Pressure High Temperature (HPHT) Synthesis and Physical Characterization of Magneto-Superconducting RuSr2Tb1.5Ce0.5Cu2O10 Ceramic Compound

2006 ◽  
Vol 47 ◽  
pp. 31-36
Author(s):  
Alberto Ubaldini ◽  
V.P.S. Awana ◽  
S. Balamurugan ◽  
E. Takayama-Muromachi
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Magnetic Transition ◽  
Magnetic Ordering ◽  
Superconducting Transition ◽  
Synthesis Conditions ◽  
High Pressure High Temperature ◽  
Interesting Class ◽  
Ceramic Compound

The ruthenocuprates family is a very interesting class of materials, because of the coexistence of superconductivity and magnetic ordering. Ruthenocuprates include RuSr2RECu2O8 and RuSr2(RE,Ce)2Cu2O10- (RE = rare earth elements or Y). It is possible to synthesize samples of these phases with Gd, Eu or Sm with normal synthesis conditions. For the others high-pressure high-temperature (HPHT) synthesis is required. We had successfully synthesized the RuSr2Tb1.5Ce0.5Cu2O10 by HPHT technique, starting from RuO2, SrO2, Tb4O7, CeO2, CuO and Cu. Around 300 mg of the mixture was allowed to react in a flat-belt-typehigh- pressure apparatus at 6GPa and 1200 °C – 1550 °C. The optimised temperature of synthesis was found to be in the range between 1350 °C – 1450 °C. The as-synthesized compound crystallized with a structure belonging to the space group I4/mmm. DC magnetic susceptibility versus temperature plot for RuSr2Tb1.5Ce0.5Cu2O10 in an applied field of 10 Oe demonstrated magnetic transition at 150 K but the superconducting transition was not clearly observed. To our knowledge this is the first successful synthesis of the Tb based Ru-1222 phase.

Ni6B22O39·H2O – extending the field of nickel borates

2017 ◽  
Vol 72 (12) ◽  
pp. 967-975 ◽  
Author(s):  
Martin K. Schmitt ◽  
Hubert Huppertz
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
High Temperature ◽  
Temperature Reaction ◽  
Orthorhombic Space Group ◽  
X Ray ◽  
High Temperature Reaction ◽  
High Pressure High Temperature ◽  
Related Phase

AbstractNi6B22O39·H2O was synthesized in a high-pressure/high-temperature reaction at 5 GPa/900°C. It crystallizes in the orthorhombic space group Pmn21 (no. 31) with the lattice parameters a=7.664(2), b=8.121(2) and c=17.402(2) Å. The crystal structure is discussed with regard to the isotypic compounds M6B22O39·H2O (M=Fe, Co) and the structurally related phase Cd6B22O39·H2O. Furthermore, the characterization of Ni6B22O39·H2O via X-ray powder diffraction and vibrational spectroscopy is reported.

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