Synthesis, crystal structure and magnetic properties of Sr 5(CrO 4) 3(Cu 0.586O) with apatite-like structure

Tyutyunnik, A. P.
Bazuev, G. V.

Open PDF

Open link

Publication date

January 2012

DOI

10.1016/j.jallcom.2012.01.138

Publisher

Elsevier BV

ISSN

0925-8388

Journal

Journal of Alloys and Compounds

Citation count (estimate)

Abstract

The crystal structure of apatite Sr 5(CrO 4) 3(Cu 0.586O) was solved using X-ray diffraction data with GSAS program in the space group P6 3/m with hexagonal unit cell parameters: a = 10.0292(1), c = 7.4623(1) Å, V = 650.033(8) Å 3, and Z = 2. This compound is stable up to 1473 K in air. It was found that copper in the form of Cu + cations is located in infinite linear (CuO) -1 chains inserted into the tunnels parallel to the hexagonal c axis. The chains contain about 40% vacancies in copper positions. The experimental value of the effective magnetic moment (μ eff) for the 1 Cr atom in formula Sr 5(CrO 4) 3(Cu 0.586(4)O) (1.671 μ B) is slightly smaller than the theoretical moment (1.732 μ B) calculated in the assumption that all chromium is ...