Magnetic and Electrical Properties of LaAMn O3(A= Na, K, Rb, and Sr) with Perovskite-Type Structure

Synthesis, Structure, and Properties of Sodium or Potassium-Doped Lanthanum Orthomanganites from NaCl or KCl Flux

“…Na and K doped lanthanum manganites have been reported by Shimura et al (13). They have prepared the sample by solid state method, and maximum substitution of Na for La in LaMnO is reported to be 0.2 with Mn> concentration as high as 40%.…”

Synthesis, structural and ferromagnetic properties of La1−x K x MnO3 (0·0 ≤ x ≤ 0·25) phases by solution combustion method

“…It is possible to achieve an equal amount of hole doping with half the number of the monovalent ions, because for the same amount of aliovalent dopant the hole density is twice that of the divalent ion doping. Monovalent ion-doped rare earth manganites of the general formula, Ln 1-x A x MnO 3 (Ln = La, Pr, Nd; A = Na, K, Rb), provide another series of oxides to study the physical phenomena of insulator-to-metal transition and colossal magnetoresistance (Itoh et al 1995;Shimura et al 1996;Chen and de Lozanne 1997;Ng-Lee et al 1997;Sahana et al 1997;Singh et al 1998). Alkali metal ion doped lanthanum manganites have been prepared by the conventional ceramic methods (Itoh et al 1995;Shimura et al 1996), alkali-flux method (Singh et al 1998;Shivakumara et al 2004) and fused salt electrolysis (McCarroll et al 1999).…”

Structure, magnetic and electrical properties of La0.6Sr0.4−xKxMnO3 perovskites

“…These compounds crystallize in a rhombohedral distorted perovskite structure with space group R3c [21] and exhibit both paramagnetic-ferromagnetic and semiconductor-metallic transitions with decreasing temperature. The substitution of a divalent alkali element in the A perovskite sites by a monovalent one induces variations in the r A size and in the Mn 3+ /Mn 4+ ratio.…”