The formation of the complex manganites LnSr2Mn2O7 (Ln=La, Nd, Gd)

Abstract

The formation of the complex manganites LnSr(2)Mn(2)O(7) (Ln = La, Nd, Gd) Missyul, A. B.; Zvereva, I. A.; Palstra, T. T. M.

Influence of thermal processing on magnetotransport characteristics of NdSr 2 Mn 2 O 7+ δ

“…Because of this behavior, the use of the Curie-Weiss law for approximation of the susceptibility curves gives irrational results. Negligible quantitative divergence between the temperature dependencies of magnetic susceptibility and results observed by Missyul et al [9] also seen in Fig. 3b.…”

“…Owing to their complex layered perovskite-like structure, these phases demonstrate a number of unique properties. The major interest of researchers to the RP compounds is caused by colossal magnetoresistance (CMR) effect, which is usually observed in these systems [4][5][6][7][8][9]. It was established that both ionic radius of rare earth element (REM) and valence states of manganese atoms determine electronic characteristics of the Ln 2Àx Sr 1+x Mn 2 O 7 phases [10].…”

“…(a) T peak values as function of the annealing temperature, (b) the temperature dependencies of the inverse magnetic susceptibility compared with data obtained by Missyul et al[9].…”

Protonated Oxide, Nitrided, and Reoxidized K2La2Ti3O10 Crystals: Visible-Light-Induced Photocatalytic Water Oxidation and Fabrication of Their Nanosheets

“…The weight loss from 25 to 300 °C corresponds to the desorption of 0.56 wt % adsorbed water on the crystal surface (25–100 °C) and release of 0.45 wt % interlayer water (100–300 °C) . A significant weight loss and an endothermic peak observed in the range of 300–350 °C can be attributed to the desorption of water contained in the oxide matrix of [La 2 Ti 3 O 10 ] 2– . The weight change from 350 to 940 °C is associated with the transformation from oxynitride to oxide (i.e., resubstitution of 3O 2– for 2N 3– ) through two processes: (i) formation of the dinitrogen-containing intermediate compound (K 2 La 2 Ti 3 O 10 (N 2 ) 1/2 x ) and oxidation of Ti 3+ into Ti 4+ (350–570 °C) and (ii) the release of dinitrogen (N 2 ) gas from K 2 La 2 Ti 3 O 10 (N 2 ) 1/2 x crystals (570–940 °C): …”

“…8 A significant weight loss and an endothermic peak observed in the range of 300−350 °C can be attributed to the desorption of water contained in the oxide matrix of [La 2 Ti 3 O 10 ] 2− . 33 The weight change from 350 to 940 °C is associated with the transformation from oxynitride to oxide (i.e., resubstitution of 3O 2− for 2N (3)…”