Preparation and Characterization of (C4H9NH3)2MCl4 (M=Mn, Cu)

2004 ◽  
Vol 848 ◽  
Author(s):  
Liling Guo ◽  
Yadong Dai ◽  
Mingjie Hu ◽  
Hanxing Liu ◽  
Shixi Ouyang
Keyword(s):  
Layered Perovskite ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Lower Temperature ◽  
Xrd Patterns ◽  
Jahn Teller Distortion ◽  
Perovskite Type

ABSTRACTWith the preparation of organic-inorganic layered perovskite-type compounds (C4H9NH3)2MCl4 (M = Mn, Cu) in solutions, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermal gravimetry (TG) and differential scanning calorimetry (DSC) have been used to characterize the obtained powders. XRD patterns demonstrate that the two compounds have obvious layered structures and SEM pictures reveal that both (C4H9NH3)2MnCl4 and (C4H9NH3)2CuCl4 take on obvious sheet-like microstructure. TG&DSC curves indicate that (C4H9NH3)2CuCl4 decomposes at much lower temperature than (C4H9NH3)2MnCl4.This is ascribed to weakening interactions between its organic and inorganic components, which is presumably due to the Jahn-Teller distortion of [CuCl6] octahedra.

Phase Transition of LiMn2O4 Spinel and its Application for Lithium Ion Secondary Battery

1997 ◽  
Vol 496 ◽  
Author(s):  
Junji Tabuchi ◽  
Tatsuji Numata ◽  
Yuichi Shimakawa ◽  
Masato Shirakata
Keyword(s):  
Phase Transition ◽  
Lithium Ion ◽  
Electrochemical Characteristics ◽  
Teller Distortion ◽  
Limn2o4 Spinel ◽  
Structure Changes ◽  
Jahn Teller ◽  
Initial Charge ◽  
Lower Temperature ◽  
Jahn Teller Distortion

ABSTRACTLiMn2O4 has a phase transition at room temperature, which is caused by Jahn-Teller distortion. DC resistivity of LiMn2O4 shows an anomaly at the transition temperature, while no such anomaly is observed in samples with excess lithium. X-ray diffraction patterns of LiMn2O4reveal that the crystal structure changes from cubic at higher temperature to orthorombic, as a first approximation, at lower temperature. However, no differences in initial charge-discharge curve are observed, which means that the Jahn-Teller distortion has no effect on electrochemical characteristics. The authors have succeeded in mass-producing lithium ion secondary batteries with a manganese spinel cathode.

Pauladamsite, Cu4(SeO3)(SO4)(OH)4·2H2O, a new mineral from the Santa Rosa mine, Darwin district, California, USA

2016 ◽  
Vol 80 (6) ◽  
pp. 949-958 ◽  
Author(s):  
A. R. Kampf ◽  
S. J. Mills ◽  
B. P. Nash
Keyword(s):  
New Mineral ◽  
X Ray Diffraction ◽  
Secondary Oxidation ◽  
Calculated Density ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Perfect Cleavage ◽  
Mohs Hardness ◽  
Jahn Teller Distortion ◽  
Pale Green

AbstractPauladamsite (IMA2015-005), Cu4(SeO3)(SO4)(OH)4·2H2O, is a new mineral from the Santa Rosa mine, Darwin district, Inyo County, California, USA, where it occurs as a secondary oxidation-zone mineral in association with brochantite, chalcanthite, gypsum, ktenasite, mimetite, schulenbergite and smithsonite on limonitic gossan. Pauladamsite forms green, multiply twinned blades up to 0.5 mm long grouped in radial sprays. The streak is pale green. Crystals are transparent and have vitreous to silky lustre. The Mohs hardness is ∼2, the tenacity is brittle, the fracture is irregular and crystals exhibit one perfect cleavage on [001]. The calculated density is 3.535 g/cm3. Electron microprobe analyses provided: CuO 48.96, ZnO 3.56, SeO2 18.82, SO3 13.90, H2O 13.29 (calc.), total 98.53 wt.%. The empirical formula (based on 13 O apfu) is: (Cu3.55Zn0.25)∑3.80Se0.98SO13H8.50. Pauladamsite is triclinic, P1, a = 6.0742(7), b = 8.4147(11), c = 10.7798 (15) Å, α = 103.665(7), β = 95.224(7), γ = 90.004(6)°, V = 533.03(12) Å3 and Z = 2. The eight strongest lines in the powder X-ray diffraction pattern are [dobs in Å(I)(hkl)]: 10.5(46)(011); 3.245(100)(001); 5.81(50)(011); 2.743(49)(112); 3.994(67)(012); 3.431(23)(1̄12,1̄2̄1,1̄20); 2.692(57)(03̄2,1̄22,2̄1̄2); and 2.485(39)(21̄2,1̄3̄2,02̄4). The structure of pauladamsite (R1 = 10.6% for 2086 Fo > 4σF) contains Cu2+O6 octahedra, SO4 tetrahedra and Se4+O3 pyramids. There are four different CuO6 octahedra, each of which exhibits typical Jahn-Teller distortion, with four short equatorial Cu–O bonds and two much longer apical Cu–O bonds. The CuO6 octahedra share edges to form five-octahedra-wide bands extending along [100]. Adjacent bands are connected in the [011̄] direction by bridging SO4 tetrahedra and in the [011] direction by bridging Se4+O3 pyramids, thereby forming a framework.

Variation of the Jahn–Teller distortion with pressure in the layered perovskite Rb2CuCl4: local and crystal compressibilities

2007 ◽  
Vol 19 (34) ◽  
pp. 346229 ◽  
Author(s):  
F Aguado ◽  
F Rodríguez ◽  
R Valiente ◽  
M Hanfland ◽  
J P Itié
Keyword(s):  
Layered Perovskite ◽  
Teller Distortion ◽  
Jahn Teller ◽  
Jahn Teller Distortion

scholarly journals Synthesis and Characterization of Nanocrystalline Aluminophosphate AlPO4-5 Molecular Sieve

2018 ◽  
Vol 24 (3) ◽  
pp. 161
Author(s):  
Asir Alnaama
Keyword(s):  
Molecular Sieves ◽  
Ammonium Hydroxide ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Synthesis Parameters ◽  
Bet Analysis ◽  
Xrd Patterns ◽  
Adsorption Desorption

Nanocrystalline aluminophosphate AlPO4-5 molecular sieves were synthesized by hydrothermal method (HTS). Synthesis parameters like time and temperature of crystallization were investigated. Type of template (R) and ratio of R/P2O5 were studied also. Characterization of the synthesized AlPO4-5 were done by powder X-ray diffraction (XRD), scanning electron microscopy (SEM/EDX), Fourier transform infrared (FTIR), differential scanning calorimetry-thermogravimetry analysis (DSC-TGA), and N2 adsorption-desorption BET analysis. XRD patterns results showed excellent crystallinity for two types of templates, di-n-propylamine (DPA) and tetrapropyl ammonium hydroxide (TPAOH) for alumminophosphate five (AFI) structure. Nano-level for particle size of 66 nm was revealed by AFM test. Good thermal stability was obtained in DSC-TGA results. Best time and temperature of crystallization of 24h and 190 O C were got. Optimum R/P2O5 for two kind of template was established.  

X-ray diffraction measurement of the Jahn-Teller distortion in TmVO4

1974 ◽  
Vol 15 (1) ◽  
pp. 101-104 ◽  
Author(s):  
Armin Segmüller ◽  
R.L. Melcher ◽  
H. Kinder
Keyword(s):  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Teller Distortion ◽  
X Ray ◽  
Jahn Teller ◽  
Jahn Teller Distortion

Enhancement of the guest orderliness in a low-symmetric perovskite-type metal–organic framework influenced by Jahn–Teller distortion

2018 ◽  
Vol 20 (34) ◽  
pp. 21809-21813 ◽  
Author(s):  
M. Viswanathan
Keyword(s):  
Neutron Diffraction ◽  
Single Crystal ◽  
Metal Organic Framework ◽  
Teller Distortion ◽  
Unusual Effect ◽  
Jahn Teller ◽  
Metal Organic ◽  
Jahn Teller Distortion ◽  
Perovskite Type ◽  
Organic Framework

Single-crystal neutron diffraction reveals an enhancement of the guest-orderliness in a low-symmetric MOF, with an opposite scenario for its high-symmetric cousin. The mechanism behind this unusual effect is proposed.

scholarly journals High-Pressure Energy Dispersive X-Ray Diffraction Investigation of Lithium-Manganese Spinel

2007 ◽  
Vol 130 ◽  
pp. 69-72 ◽  
Author(s):  
Paweł Piszora
Keyword(s):  
High Pressure ◽  
Hexagonal Boron Nitride ◽  
Axial Ratio ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Teller Distortion ◽  
Cell Experiment ◽  
Jahn Teller ◽  
Diamond Anvil ◽  
Jahn Teller Distortion

The formation of the tetragonal high-pressure structure, attributed to the Jahn-Teller distortion, was proved. The c/a axial ratio shows an increasing trend towards a stronger tetragonal distortion at high pressure. Rietveld refinement after the pressure relaxation demonstrates the presence of tetragonal artefacts of the high-pressure structure only for the LiMn2O4 sample compressed in hexagonal boron nitride (h-BN), whereas the sample compressed in silicone reveals the pure cubic phase. Confrontation with the result of the first angle-dispersive diamond-anvil-cell experiment is presented.

The Preparation and Crystal Structure of Ammonium Bis[citrato(3-)]cuprate(II)

1991 ◽  
Vol 44 (10) ◽  
pp. 1495 ◽  
Author(s):  
RC Bott ◽  
DS Sagatys ◽  
DE Lynch ◽  
G Smith ◽  
CHL Kennard ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Citric Acid ◽  
Monoclinic Space Group ◽  
X Ray Diffraction ◽  
Teller Distortion ◽  
Space Group ◽  
X Ray ◽  
Jahn Teller ◽  
A Cell ◽  
Jahn Teller Distortion

The copper(II) complex with citric acid (NH4)4 [Cu(C6H5O7)2] has been prepared, and its structure determined by X-ray diffraction, giving a residual R 0.035 for 1208 observed reflections. Crystals are monoclinic, space group P21/c with Z 2 in a cell of dimensions a 8.755(3), b 13.185(4), c 9.364(2)Ǻ, β 113.73(2)°. The complex is a centrosymmetric six-coordinate monomer which is isomorphous with ammonium zinc(II) citrate. However, the Cu-O(hydroxyl) bonds [2.341(3)Ǻ] show Jahn-Teller distortion relative to the Cu-O(carboxyl) bonds [1.969(3) and 1.977(3)Ǻ].

Sign in / Sign up

Export Citation Format

Share Document