Abstract :
Summary form only given. New results concerning Co ions nearest coordinational environment in ferromagnetic powders of CoPcNa/sub 2.8/ (Pc - Phthalocyaninell were ob 4-ained in recent research.EXAFS (Extended X-ray Absorption Fine Stru cture) spectroscopy method was used. Two alternative models of struc tural ordering in CoPcNa/sub 2.8/ are suggested - the model of dimers and the model of two phases. In accordance with the first model the whole substance of CoPcNa/sub 2.8/, consists of (CoPcNa/sub 2.8/ )p dimers. (CoPc) T, an ions MO calculation at n=4,5,6 shows that anions have high spin va lues: S=5/2 and 2. S high values predeterminate high TC values of MPcAx (M=Fe.Co,Ni,Mn; A - AlIcaline Metals) compounds at ferromagnetic ordering of dimers. In accordance with the second model, CoPcNaZ.S is considered to be a compound which consists of two structural phases: charge transfer salt of CoPcNap,& and metallic particles of Co. Parion is from the I-o content in CoPcNa/sub 2.8/ compound particles concenrate and their linear sizes don´t exceed 10 A. Co particles magnetization in ferromagnetic state is more than 20 times less than CoPr-Na2.,g mag netization in vacuum (ne 10 G-cm /g.Y. Thus, in this model as well hi ghly magnetic properties of CoPcNa2,,p are determined by organometal matrix only.
