Phase Stability, Structural Evolution and Magnetic Properties of Sc(1-x)LuxVO3 (0.0 
详细信息 查看全文
- 作者：Rylan J. Lundgren ; Lachlan M. D. Cranswick ; Mario Bieringer
- 刊名：Chemistry of Materials
- 出版年：2007
- 出版时间：August 7, 2007
- 年：2007
- 卷：19
- 期：16
- 页码：3945 - 3955
- 全文大小：614K
- 年卷期：v.19,no.16(August 7, 2007)
- ISSN：1520-5002
文摘
We report the synthesis and formation mechanism of Sc(1-x)LuxVO3 (0.0 
x 1.0) using in situpowder X-ray diffraction and bulk solid-state preparation methods. The reduction of the solid solutionSc(1-x)LuxVO4 (0.0 x 1.0) results in orthorhombic perovskites (space group Pnma) Sc(1-x)LuxVO3for x 
0.58 and cubic bixbyites (space group: Ia
) Sc(1-x)LuxVO3 for Sc-rich samples with x < 0.1.During the high-temperature synthesis, Sc-rich bixbyite structures are initially formed and in a secondstep Lu-rich perovskites are formed. This two-step process is followed by Sc-Lu exchange between thetwo initial phases as shown by time-resolved powder X-ray diffraction. The in situ diffraction studiesprovide the basis for the preparation of metastable bixbyite as well as thermodynamically stable perovskiteand bixbyite phases. For the perovskite phases, low-temperature powder neutron diffraction data and dcmagnetic susceptibility data show that the Néel temperatures for the canted antiferromagnets range from50 K for x = 0.58 to 100 K for x = 0.9. The Néel temperatures correlate with the V-O-V bond anglesin the orthorhombic structures. The magnetic structure evolution has been followed as a function oftemperature using powder neutron diffraction. In contrast, the cation-disordered bixbyite phases do notundergo magnetic long-range ordering, even at temperatures as low as 3 K.
x 1.0) using in situpowder X-ray diffraction and bulk solid-state preparation methods. The reduction of the solid solutionSc(1-x)LuxVO4 (0.0 x 1.0) results in orthorhombic perovskites (space group Pnma) Sc(1-x)LuxVO3for x 0.58 and cubic bixbyites (space group: Ia) Sc(1-x)LuxVO3 for Sc-rich samples with x < 0.1.During the high-temperature synthesis, Sc-rich bixbyite structures are initially formed and in a secondstep Lu-rich perovskites are formed. This two-step process is followed by Sc-Lu exchange between thetwo initial phases as shown by time-resolved powder X-ray diffraction. The in situ diffraction studiesprovide the basis for the preparation of metastable bixbyite as well as thermodynamically stable perovskiteand bixbyite phases. For the perovskite phases, low-temperature powder neutron diffraction data and dcmagnetic susceptibility data show that the Néel temperatures for the canted antiferromagnets range from50 K for x = 0.58 to 100 K for x = 0.9. The Néel temperatures correlate with the V-O-V bond anglesin the orthorhombic structures. The magnetic structure evolution has been followed as a function oftemperature using powder neutron diffraction. In contrast, the cation-disordered bixbyite phases do notundergo magnetic long-range ordering, even at temperatures as low as 3 K.