scholarly journals The crystal structure of antimicrobial products: hexadecyltrimethyl ammonium bromide and iodide

1981 ◽  
Vol 37 (a1) ◽  
pp. C74-C74 ◽  
Author(s):  
J. M. Grochowski
Keyword(s):  
Crystal Structure ◽  
Ammonium Bromide ◽  
Hexadecyltrimethyl Ammonium Bromide

Synthesis of Uniform Barium Ferrite Powders by Co-Precipitation Method

2017 ◽  
Vol 898 ◽  
pp. 1649-1654 ◽  
Author(s):  
Min Chen ◽  
Run Hua Fan ◽  
Zi Dong Zhang ◽  
Yan Sheng Yin ◽  
Li Hua Dong
Keyword(s):  
Calcination Temperature ◽  
Barium Ferrite ◽  
Water Bath ◽  
Precipitation Method ◽  
Ammonium Bromide ◽  
Barium Ferrites ◽  
Hexagonal Barium Ferrite ◽  
Crystallite Sizes ◽  
Co Precipitation ◽  
Hexadecyltrimethyl Ammonium Bromide

The uniform hexagonal barium ferrite powders were synthesized by co-precipitation method using metal chloride. The effects of the amount of hexadecyltrimethyl ammonium bromide (CTAB), the water bath and calcination temperature on the phase formation, microstructure and density of barium ferrites were systematically investigated. The results showed that the formation of uniform hexagonal barium ferrite powders was significantly influenced by the amount of CTAB and the water bath could lead to the larger grain size and density. The SEM demonstrated that the BaFe12O19 powders had plate-like shape with crystallite sizes varing from 150 to 200 nm. When the amount of CTAB was 0.2g/100ml and the calcination temperature was 850 °C, the barium ferrite powders were uniform which indicated that the amount of surfactant and calcination temperature were very optimum.

Crystal Structure of La3OBr[AsO3]2

2010 ◽  
Vol 65 (10) ◽  
pp. 1289-1292 ◽  
Author(s):  
Hamdi Ben Yahia ◽  
Rainer Pöttgen ◽  
Ute Ch. Rodewald
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Lanthanum Oxide ◽  
Ammonium Bromide ◽  
Space Group ◽  
Type Space ◽  
Oxygen Atoms

Colorless needles of the arsenite bromide La3OBr[AsO3]2 were synthesized from ammonium dihydrogen arsenate, ammonium bromide and lanthanum oxide in an NaBr/KBr flux at 900 °C. La3OBr[AsO3]2 crystallizes with the centrosymmetric tetragonal La3OCl[AsO3]2 type, space group P42/mnm. The structure was refined from single-crystal diffractometer data: a = 13.0431(15), c = 5.6127(7) Å , wR2 = 0.0454, 945 F2 values, and 39 variables. It consists of chains of trans-edge-sharing OLa4/2 tetrahedra which are coordinated by [AsO3]3− units via the oxygen atoms

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