The study of the spin transition process in Na[Fe(Th-Sa)2] by electron paramagnetic resonance

• Autorzy: Yablokov Y. V. , Zelentsov V. V. , Augustyniak-Jabłokow M. , Krupska A. , Mroziński J.
• Języki publikacji: EN

Abstrakty

EN

The crossover phenomenon in Na[Fe(Th-Sa)2], a representative of a large class of the Fe(III) thiosemi-carbazonates, was examined by X-band EPR in temperatures 80 - 300°K and magnetisation of a polycrystalline sample was collected in the temperature range 1.8 - 300 K. The main results are as follows:- The appearance of LS complexes is requires thermal population of the 2A term but the transition process is ruled by other factors.- The LS complexes formed are not statistically distributed among the HS ones but tend to assemble in restricted spaces of the crystal lattice (domains) in which both short-range and long-range interactions of the complexes occur. - The increase in the cooperative interactions between the LS complexes and the enlargement of domains occur gradually with two jump changes. Each of the jumps has different character; the first is related to a redistribution of the complexes in domains and the other to a rapid increase in the LS phase volume.

Słowa kluczowe

EN

paramagnetic resonance; crossover phenomenon; spin transition

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Materials Science
• Rocznik: 2003
• Tom: Vol. 21, No. 2
• Strony: 215--223
• Opis fizyczny: Bibliogr. 12 poz.,

Twórcy

autor

Yablokov Y. V.

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

autor

Zelentsov V. V.

• Moscow Physical Technical Institute, 141 700 Dolgoprudnii, Russia

autor

Augustyniak-Jabłokow M.

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

autor

Krupska A.

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

autor

Mroziński J.

• Faculty of Chemistry University of Wroclaw, 14 F. Joliot-Curie, 50-383 Wroclaw, Poland

Bibliografia

• [1] Zelentsov V.V., Mokshin V.M., Sobolev S.S., Shipilov V.l., Khim. Fizika, 7 (1988), 51.
• [2] Spiering H., Kohlhaas T., Romsted H. Hauser A., Bruns-Yimlaz C., Gutlich P., Coord. Chem. Rev., 190-192 (1999), 629.
• [3] Molnar G., Bousseksou A., Zwick A., McGarvey J., Chem. Phys. Lett., 367 (2003), 593.
• [4] Kogan V.A., Zelentsov V. V., Larin G.M., Lukov V.V., Transition Metal Complexes with Hydrazones (in Russian), Moscow, Science, 1990.
• [5] Zelentsov V.V., Russian Chem. J., 49 (1996), 86.
• [6] König E., Magnetic Properties of Coordination and Organometallic Transition Metal Compounds, Springer-Verlag, Berlin, 1966.
• [7] Zelentsov V.V., Yablokov Yu.V., Augustyniak-Yablokov M., Krupska A., Mrozinski J. (to be published).
• [8] Shipilov V.l., Fidirko V.A, Zelentsov V.V., Mokshin V.M., Solid State Phys. Russ., 21 (1979), 3553.
• [9] Spiering H., Meissner E., Koppen H., Muller E.W., Gutlich P., Chem. Phys., 68 (1982), 65.
• [10] Willenbacher N., Spiering H.J., Phys. C: Solid State Phys., 21 (1988), 1423.
• [11] Eremin M.V., Ivanova T.A, Yablokov Yu.V., Gumerov R.M., Zhur. Exper. Theor. Fiz., 87 (1984), 220.
• [12] Augustyniak-Yablokov M., Yablokov Yu.V., Solid St. Comm., 115 (2000), 439.