کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333905 979117 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Magnetic susceptibility, specific heat and magnetic structure of CuNi2(PO4)2
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Magnetic susceptibility, specific heat and magnetic structure of CuNi2(PO4)2
چکیده انگلیسی

The CuNi2(PO4)2 phosphate has been synthesized by the ceramic method at 800 °C in air. The crystal structure consists of a three-dimensional skeleton constructed from MO4 (MIICu and Ni) planar squares and M2O8 dimers with square pyramidal geometry, which are interconnected by (PO4)3− oxoanions with tetrahedral geometry. The magnetic behavior has been studied on powdered sample by using susceptibility, specific heat and neutron diffraction data. The bimetallic copper(II)–nickel(II) orthophosphate exhibits a three-dimensional magnetic ordering at, approximately, 29.8 K. However, its complex crystal structure hampers any parametrization of the J-exchange parameter. The specific heat measurements exhibit a three-dimensional magnetic ordering (λ-type) peak at 29.5 K. The magnetic structure of this phosphate shows ferromagnetic interactions inside the Ni2O8 dimers, whereas the sublattice of Cu(II) ions presents antiferromagnetic couplings along the y-axis. The change of the sign in the magnetic unit-cell, due to the [1/2, 0, 1/2] propagation vector determines a purely antiferromagnetic structure.

Magnetic structure of CuNi2(PO4)2.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 179, Issue 10, October 2006, Pages 3052–3058
نویسندگان
, , , , , , ,