Mn site substitution of La0.67Ca0.33MnO3 with closed shell ions: Effect on magnetic transition temperature

Mn site is substituted with closed shell ions (Al, Ga, Ti, Zr and a certain combination of Zr and Al) and also with Fe and Ru ions carrying the magnetic moment (S=5/2 and 2 respectively) at a fixed concentration of 5 at %. Substitution did not change either the crystal symmetry or the oxygen stoichiometry. All substituents were found to suppress both the metal-insulator and ferromagnetic transition temperatures (T _p(ρ) and T _C, respectively) to varied extents. Two main contributions identified for the suppression are the lattice disorder arising due to difference in the ionic radii between the substituent (r _M) and the Mn³⁺ ion (r _Mn ³⁺) and in the case of the substituents carrying a magnetic moment, the type of magnetic coupling between the substituent and that of the neighboring Mn ion.     

Influence of interacting resonances on the electron paramagnetic resonance spectrum of Gd<Superscript>3+</Superscript> dipole centers in fluorites

This paper discusses the possibility of detecting the selective averaging of spin packets in the vicinity of coincidence of the electron paramagnetic resonance signals associated with transitions of Gd³⁺ dipole centers due to orientational relaxation.     

Thermal decomposition of 2-hydroxyalkylthiol esters of phosphorus acids

Conclusions The decomposition of the 2-hydroxyalkylthiol esters of phosphorus acids at atmospheric pressure leads to alkylene sulfides and the corresponding phosphorus acids. The direction of the reaction for the thermal decomposition of these esters in vacuo depends on the structure of the substituents on the phosphorus atom.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2625–2627, November, 1976.     

Reaction of 1-morpholinocyclododecene with acrolein and synthesis of bicyclo[9.3.1]pentadecan-15-one

Russian Chemical Bulletin -     

Catalytic polymerization of olefins

Russian Chemical Bulletin -