Local structure and electron configuration effects on Curie temperature in La0.7Ca0.3Mn1−Ti O3 lanthanum manganites

Room temperature magnetic and magnetocaloric properties of La0.67Ba0.33Mn0.98Ti0.02O3 perovskite

“…We can see in this table that the cell volume increases slightly with the titanium doping. This is the first indication of the incorporation of titanium in the manganese site suggesting that titanium is in a tetravalent state [9,10] substituting the Mn 4+ ion with a lower ionic radius (r Mn4+ = 0.53Å < r Ti4+ = 0.605Å for 6-fold coordination [11]). The increase of the cubic cell parameter is in good agreement with the results obtained by Zhong et al [8] for oxygen deficient compounds La 2/3 Ba 1/3 MnO 3−ı .…”

Effect of Ti4+substitution on structural, transport and magnetic properties of La0.67Sr0.33Mn1−xTixO3

“…The ionic radius of the Ti 4+ ion is known to be in between those of Mn 4+ and Mn 3+ and there exists a distinct possibility that a fraction of Ti 4+ ions substitute for Mn 3+ ions, leading to oxygen non-stoichiometry (cation deficiency) or such inhomogeneities. The available literature on Ti substitution in manganites indicates that Ti 4+ ions substitute the isovalent Mn 4+ ions in these materials [24][25][26][27][28][29][30][31][32][33]. Recently, however, it has been shown that at high doping levels Ti 4+ ions occupy Mn 3+ sites in addition to Mn 4+ sites [34].…”

Influence of non-magnetic Ti4+ion doping at Mn site on structural and magnetic properties of La0.67Ba0.33MnO3

“…Considering the solid solution La 0.67 Ba 0.33 Mn 1−x Ti x O 3 , we can expect that titanium is in its tetravalent state and consequently the non-magnetic Ti 4+ (Ar, 3d 0 ) ion substitutes the magnetic Mn 4+ (Ar, t 3 2g e 0 g ) one, as found in [12] in the close La 0.7 Ca 0.3 Mn 1−x Ti x O 3 system. This isovalent substitution is interesting since it should not strongly modify the crystalline structure due to the slight difference between the tetravalent ionic radii of Mn 4+ and Ti 4+ (r 4+ Mn = 0.53 Å and r 4+ Ti = 0.605 Å for 6-fold coordination [13]), but should strongly affect the DE induced FM behaviour of the parent compound La 0.67 Ba 0.33 MnO 3 due to the presence of non-magnetic Ti 4+ .…”