Estimation of Mn4+ ion content ratio in self-doped compound La1−xMnO3−δ

Abstract

A method based on the thermal equilibrium theory of crystal defects for estimating the Mn4+ ion content ratio (RM4) at B sites in ABO3 self-doped manganite La1−xMnO3−δ is presented. For this kind of manganite, the relationship between the Curie temperature (TC) and RM4 can be explained by the double exchange mechanism of Zener, which is similar to that in the perovskite manganite La1−xCaxMnO3.

Roles of Te and Mn in the two phases of manganite with nominal composition La0.6Sr0.1Te x MnO3

“…Based on the thermal equilibrium theory of crystal defects [17,21], the ions should first occupy A sites, vacancies should be at the B sites in ABO 3 structure, because the intervals of the B site is smaller than that of the A site. where e, the vacancy content parameter, is related to the preparation conditions and is taken as 0.015 according to our another paper [22].…”

“…According to our previous studies [17][18], the manganite with nominal composition La 0.6 Sr 0.1 MnO 3 should possess two phases with a perovskite main phase and a Mn 3 O 4 second phase. As we know, if Te ions can be doped into A sites of the ABO 3 perovskite phase, similarly to La or Sr ions, the content of the Mn 3 O 4 second phase in the samples should decrease or even disappear with increasing x in our samples La 0.6 Sr 0.1 Te x MnO 3 .…”

Influence of Nonstoichiometry on Magnetocaloric Effect in (La0.7Ca0.3)1 - xMn1+xO3

“…On the basis of the thermal equilibrium theory of crystal defects [16], we have considered the following assumptions regarding the excessive manganeses and vacancies problem in the nonstoichiometric (La 0.7 Ca 0.3 ) 1−x Mn 1+x O 3 samples. The compounds with an excess of manganese were prepared by solid reaction method with the high calcination temperature.…”

Study of magnetic ordering in the perovskite manganites Pr0.6Sr0.4CrxMn1-xO3

“…In the traditional view, all O ions are assumed to be O 2-, and the magnetic properties and electronic transport properties of Ln 1-x T x MnO 3 are correlated via the super-exchange (SE) interaction along the Mn 3+ -O 2--Mn 3+ ionic chain and the double exchange (DE) interaction along the Mn 3+ -O 2--Mn 4+ ionic chain. [2][3][4][5][6][7][8][9][10][11][12][13] For the Pr 0.6 Sr 0.4 MnO 3 manganite, there is an anomalous decrease at around 60 K in the specific magnetization (σ) versus temperature (T ). There have been conflicting reasons given in previous reports for this decrease as well as for the magnetic moment directions of the Pr and Mn cations in Pr 1-x T x MnO 3 .…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] In Ln 1-x T x MnO 3 compounds, the Ln and T cations with large ionic radii occupy the A sites, forming the A sublattice, and the Mn cations with small ionic radii occupy the B sites, forming the B sublattice. In the traditional view, all O ions are assumed to be O 2-, and the magnetic properties and electronic transport properties of Ln 1-x T x MnO 3 are correlated via the super-exchange (SE) interaction along the Mn 3+ -O 2--Mn 3+ ionic chain and the double exchange (DE) interaction along the Mn 3+ -O 2--Mn 4+ ionic chain.…”