Mechanochemical Synthesis of LaOX (X=Cl, Br) and Their Solid State Solutions

✍ Scribed by Jaeryeong Lee; Qiwu Zhang; Fumio Saito

• Book ID: 102611212
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 312 KB
• Volume: 160
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9276

✦ Synopsis

A mixture of lanthanum oxide (La 2 O 3 ), chloride (LaCl 3 ), and bromide (LaBr 3 ) was ground in air by a planetary ball mill to investigate synthesis of lanthanum oxychloride (LaOCl), oxybromide (LaOBr), and their solid solutions, LaOCl 1؊x Br x (04x41, x ‫؍‬ 0.25). The synthesizing reactions proceed with an increase in grinding time. Unit cell dimensions, a, c, and lattice volume of the solutions evolve linearly with an increase in x in the LaOCl 1؊x Br x series. Comparing unit cell dimensions of LaOX synthesized by mechanochemical reaction to those of LaOX synthesized by solid-state reaction at high temperature, there is no di4erence in the length of c, while a is shortened slightly. This may be attributed to the complex cation layer of (LaO) n؉ n , with a close relationship to a of the cell dimensions, being a4ected by the intensive grinding.