Role of Tetravalent Ion in Metal–Insulator Transition in (La0.1Ca0.9)(Mn1−Ti )O3

Synthesis and crystal structure of (Ca, R)(Mn, Ti)O3 (R, rare earth)

“…Several compounds were prepared for various combinations of La and alkaline earth or Y by Havinga [6], to study a dilution of magnetic interaction between Mn ions via oxygen ion by substitution of Ti ion. It is considered that the tetravalent titanium ion makes the cation-anion-cation overlap integrals weaken in La 0.1 Ca 0.9 Mn 1 − x Ti x O 3 [7]. Furthermore, some compounds were synthesized and refined by the present authors [8].…”

“…Rare earth complex oxides including manganese and titanium were studied by several authors [6][7][8]. Several compounds were prepared for various combinations of La and alkaline earth or Y by Havinga [6], to study a dilution of magnetic interaction between Mn ions via oxygen ion by substitution of Ti ion.…”

A structural study of the CaLn2CuTi2O9 (Ln=Pr, Nd, Sm) and BaLn2CuTi2O9 (Ln=La, Pr, Nd) triple perovskite series

“…Tagushi et al [4] reported that all (La 0.1 (Ca 0.9 )(Mn 1Àx Ti x )O 3 (0 < x < 0.9) compounds are n-type semiconductors at low temperature; analogous to (Ln 1Àx Ca x )MnO 3 [11][12][13][14][15]. (La 1Àx Ca x )(Cr 0.5 Ti 0.5 )O 3 was reported to have catalytic and conduction properties [10]; where (Ca, Ln)(Mg, Ti)O 3 system is a microwave ceramic [8,9].…”

“…Some other compounds with a substitution of an alkaline earth element in rare earth ion position, like (Ca, Ln)(Mn, Ti)O 3 [4,5], (Ca, Ln)(ZnTi)O 3 [6], (Ca, Ln)(Ca, Ti)O 3 [7], (Ca, Ln)(Mg, Ti)O 3 [8,9], (Ca, Ln)(Cr, Ti)O 3 [10] have been studied the last years. Tagushi et al [4] reported that all (La 0.1 (Ca 0.9 )(Mn 1Àx Ti x )O 3 (0 < x < 0.9) compounds are n-type semiconductors at low temperature; analogous to (Ln 1Àx Ca x )MnO 3 [11][12][13][14][15].…”

Preparation and Properties of (YCa)(TiMn)O3−d Ceramics Interconnect of Solid Oxide Fuel Cells

“…reported perovskite-type (La 0.1 Ca 0.9 )(Mn 1–x Ti x )O 3 (0 ≤ x ≤ 0.9) are n-type semiconductors at low temperature. At high temperature, the manganates exhibit a metal–insulator transition in the range 0 ≤ x ≤ 0.3 [15]. Vashook et al investigated perovskite-type compounds La 1–x Ca x TiO 3 (x = 0.2–1.0) and La 2(1–x)/3 Ca x TiO 3 (x = 0, 0.1, 0.4 and 0.8).…”