Wydział Chemii

Tadeusz Groń

M. Karolewicz

Elżbieta Tomaszewicz

Małgorzata Guzik

Monika Oboz

Bogdan Sawicki

Henryk Duda

Z. Kukuła

2019

Journal of Nanoparticle Research

21

8/1-8/12

10.1007/s11051-018-4450-9

Naukowa

Angielski

Artykuł

Scheelite-type Ca_1−xMn_xMoO₄ (x = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (ε_r < 15) decreasing with increasing Mn²⁺ content. CaMoO₄ and Mn²⁺-doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO₄, the balance between diamagnetism and paramagnetism for Ca_1−xMn_xMoO₄ (x = 0.01) and paramagnetic behaviour when 0.05 ≤ x ≤ 0.15 as well as the short-range antiferromagnetic interactions growing in strength as Mn²⁺ content increases. The Landé factor fitting procedure showed a spin-only contribution to the magnetic moment. CaMoO₄ matrix unexpectedly revealed the residual paramagnetism at low temperatures derived probably from the molybdenum ions having unpaired 4d electrons as well as a paramagnetic-diamagnetic transition at 70 K.

Scheelite-type structure, Mn2+-doped nanomaterials, Combustion synthesis, Electrical properties, Magnetic properties

CC-BY

http://dx.doi.org/10.1007/s11051-018-4450-9

http://link.springer.com