| dc.description.abstract | Due to the breakthrough of science and technology recently, novel multiferroic materials have been synthesized, scientists have been researching multiferroic materials since 2005, and the second type of multiferroic materials has significant physical properties and complex phase-change physical properties, scientists proposed a lot of experimental methods to explore the material’s physical phenomena, and also proposed relevant theories to describe the system, such as simple commensurate spin, complex incommensurate spin, spontaneous polarization and magnetoelectric coupling.
This thesis discusses about the physical properties and magnetic phase transition of M in M3TeO6 systems with different doping ratio. First, we use the solid-state reaction process to synthesize Co3-xCuxTeO6 samples, where x = 0.09, 0.15, and 0.18. In the AC magnetic susceptibility versus temperature trend graph, all three samples exhibited antiferromagnetic characteristics, and we also use two neutron powder diffractometers in Australia ANSTO, to determine the samples crystal structure, and the cobalt/copper ratio of each sample through the high-resolution neutron powder diffractometer. The percentage of the composition in copper on each sample is known by GSAS fitting. And we also used the high-intensity neutron powder diffractometer to observe the significant ICM peaks which at low temperature (3.5 K), and CM peaks and another different ICM peaks which are found at different temperature.
The system of Co3-xCuxTeO6 have complex and rich physical properties such as magnetic, electrical and magnetoelectric coupling. This thesis mainly studies about the magnetic properties of Co3-xCuxTeO6 with different copper-doping ratios, CM magnetic order, ICM magnetic order and the calculation and discussion of the propagation vector q value of Co3-xCuxTeO6, x=0.09, 0.15, 0.18.
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