| Autor: |
Nalbandyan VB; Southern Federal University, Rostov-on-Don 344090, Russia., Vasilchikova TM; National University of Science and Technology 'MISiS', Moscow 119049, Russia.; Lomonosov Moscow State University, Moscow 119991, Russia., Zakharov KV; Lomonosov Moscow State University, Moscow 119991, Russia., Vasiliev AN; National University of Science and Technology 'MISiS', Moscow 119049, Russia.; Lomonosov Moscow State University, Moscow 119991, Russia., Evstigneeva MA; Southern Federal University, Rostov-on-Don 344090, Russia., Guda AA; The Smart Materials Research Institute, Sladkova 178/24, Rostov-on-Don 344090, Russia. |
| Abstrakt: |
The homogeneous high-entropy wolframite-type solid solution (Mn 1/5 Co 1/5 Ni 1/5 Cu 1/5 Cd 1/5 )WO 4 was prepared by solid-state reaction at 1000 °C. Elongated "crystals" were grown from the Na 2 WO 4 flux, but their strongly broadened powder X-ray diffraction patterns indicated partial dissolution. Nevertheless, successive annealing of the homogeneous solid solution for 3-4 h at 800, 700, and 600 °C did not bring any sign of dissolution. Thus, the material is kinetically stable at low temperatures although thermodynamically unstable. The long-range antiferromagnetic order was established at T N ∼ 24.8 K. Based on magnetization and specific heat measurements, a magnetic phase diagram was built, demonstrating the presence of an additional field-induced phase. In contrast to the parent MnWO 4 , no dielectric anomaly has been found down to 2 K. |
