Anionic Structure of the So-called Ammonium Dimolybdate (NH4)2Mo2O7

1974 ◽  
Vol 13 (12) ◽  
pp. 823-823 ◽  
Author(s):  
Imme Knöpnadel ◽  
Hans Hartl ◽  
Wolf-Dietrich Hunnius ◽  
Joachim Fuchs
Keyword(s):  
Ammonium Dimolybdate

Preparation and Characterization of Large-Sized ADM Monocrystals

2012 ◽  
Vol 152-154 ◽  
pp. 126-129 ◽  
Author(s):  
Jun Zhang ◽  
Yan Hui Guo
Keyword(s):  
Thermal Analysis ◽  
Large Diameter ◽  
Optical Microscope ◽  
Ammonia Solution ◽  
High Dispersion ◽  
Quality Requirements ◽  
X Ray ◽  
Grain Distribution ◽  
Ammonium Dimolybdate

Non-agglomerated ammonium dimolybdate (ADM) monocrystals with large diameter and high dispersion has been prepared through reaction-evaporation-crystallization (REC) process using ammonium tetramolybdate and ammonia solution as reactants. The as-prepared ADM monocrystals were systematically characterized by x-ray powder diffraction, transmission-reflection optical microscope, Fourier transform infrared spectroscopy and TG-DSC thermal analysis. It is shown that the as-prepared ADM samples are disperse monocrystals with well grain distribution and geometric shape, which can well meet the quality requirements for the subsequent production of molybdenum powders.

A facile and reliable route to prepare highly dispersive ammonium dimolybdate uniform crystals from commercial molybdenum oxide

2012 ◽  
Vol 18 (5) ◽  
pp. 1824-1827 ◽  
Author(s):  
Jun Zhang ◽  
Yanhui Guo ◽  
Weiwei Lu ◽  
Xuming Guo ◽  
Mingchen Xu ◽  
...  
Keyword(s):  
Molybdenum Oxide ◽  
Ammonium Dimolybdate

Synthesis and Characterization of Rodlike Ammonium Tetrathiomolybdate and its Thermal Decomposition Mechanism

2011 ◽  
Vol 287-290 ◽  
pp. 2049-2052 ◽  
Author(s):  
Jun Zhang ◽  
Su Ping Hu ◽  
Yu Li Feng ◽  
Bo Xu ◽  
Yan Hui Guo
Keyword(s):  
Thermal Decomposition ◽  
Raw Materials ◽  
Decomposition Mechanism ◽  
Laser Raman Spectroscopy ◽  
Thermal Decomposition Mechanism ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Ammonium Sulfide ◽  
Ammonium Tetrathiomolybdate ◽  
Ammonium Dimolybdate

Rodlike ammonium tetrathiomolybdate has been synthesized via ultrasonic assistance using monocrystal ammonium dimolybdate and ammonium sulfide as raw materials. The phase compositions, purity of as-synthesized products were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), laser Raman spectroscopy(LRS). The thermal decomposition mechanism of ammonium tetrathiomolybdate was deduced by thermoanalysis. It is shown that brownish-red rhombic ammonium tetrathiomolybdate crystal with high purity could be obtained at 60°C for 1h under relatively mild conditions.

Ein polymeres Ammoniumdimolybdat aus wäßriger Lösung / A Polymeric Ammonium Dimolybdate from Aqueous Solution

1974 ◽  
Vol 29 (9-10) ◽  
pp. 599-602 ◽  
Author(s):  
Wolf-Dietrich Hunnius
Keyword(s):  
Aqueous Solution ◽  
Infrared Spectrum ◽  
Ammonium Salt ◽  
Vibrational Spectra ◽  
Ammonium Dimolybdate

The preparation of ammonium dimolybdate from aqueous solution is described, and the Raman and infrared spectrum are reported. A structure is proposed on the basis of its vibrational spectra. The ammonium salt does not contain discrete Mo272— ions, but is evidently built up by infinite chains, formed by two MoO6 octahedra with a dioxo-bridge and tetrahedra sharing corners.

Preparation of single-phase ammonium dimolybdate by combination process

Rare Metals ◽  
2012 ◽  
Vol 31 (5) ◽  
pp. 517-522 ◽  
Author(s):  
Bao Zhang ◽  
Xiaomei Xia ◽  
Qian Li
Keyword(s):  
Single Phase ◽  
Combination Process ◽  
Ammonium Dimolybdate
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