Córdova-Calderón José, Tuza Pablo V, Souza Mariana M V M
Departamento de Energía y Mecánica, Carrera de Petroquímica, Universidad de las Fuerzas Armadas-ESPE, Sangolquí EC170501, Ecuador.
Escola de Química, Universidade Federal do Rio de Janeiro (UFRJ), Centro de Tecnologia, Bloco E, Sala 206, CEP, Rio de Janeiro 21941-909, RJ, Brazil.
Materials (Basel). 2022 Mar 25;15(7):2411. doi: 10.3390/ma15072411.
In the present work, LaNiTiO and LaNiTiO nanoparticles were synthesized by the modified Pechini method. LaNiTiO was calcined at 1073 K for 17 h or 100 h, while LaNiTiO was calcined at 1273 K for 135 h. The double perovskite calcined at 1073 K for 17 h presented orthorhombic symmetry with space group, mean particle size was 31.9 ± 1 nm, random ordering of Ni and Ti cations, Néel temperature close to 15 K, and magnetic moment of 1.29 μB. By increasing the calcination time, this material showed the same symmetry and space group, a mean particle size of 50.7 ± 2 nm, short-range ordering of Ni and Ti cations, Néel temperature around 12 K, and magnetic moment of 0.96 μB. LaNiTiO presented a monoclinic crystal structure, with 2/ space group, mean particle size of 80.0 ± 5 nm, rock salt ordering of Ni and Ti, Néel temperature of approximately 23 K, and magnetic moment of 2.75 μB.
在本工作中，采用改进的佩琴尼法合成了LaNiTiO和LaNiTiO纳米颗粒。LaNiTiO在1073 K下煅烧17小时或100小时，而LaNiTiO在1273 K下煅烧135小时。在1073 K下煅烧17小时的双钙钛矿呈现正交对称性，空间群为 ，平均粒径为31.9±1 nm，Ni和Ti阳离子随机排列，奈尔温度接近15 K，磁矩为1.29 μB。通过增加煅烧时间，该材料显示出相同的对称性和空间群，平均粒径为50.7±2 nm，Ni和Ti阳离子短程有序，奈尔温度约为12 K，磁矩为0.96 μB。LaNiTiO呈现单斜晶体结构，空间群为2/ ，平均粒径为80.0±5 nm，Ni和Ti呈岩盐有序排列，奈尔温度约为23 K，磁矩为2.75 μB。
