Phase separation-induced nanoscale heterogeneity in Gd5Si1.5Ge2.5
Source abstract
Abstract
Abstract Pseudobinary Gd5(Si,Ge)4 compounds show a giant magnetocaloric effect due to an intriguing structure-magnetism interplay. Here, we report a high resolution transmission electron microscopic study of microstructure in a melt-grown compound of Gd5Si1.5Ge2.5. Electron diffraction showed that mesoscopic microstructure of the compound consists of crystals of a monoclinic structure and two kinds of orthorhombic structure. However, atomic-level imaging revealed a coexistence of mosaic-like nanodomains of these structures in each crystal. The nanodomains have twin-like interfaces along the b axis of the crystal but have semicoherent interfaces along a perpendicular axis due to stacking faults. Such a nanoscale structural heterogeneity is due to covalent bond-controlled phase separation at elevated temperatures. This finding offers insights into phase relations and abnormal magnetic behavior of Gd5(Si,Ge)4 compounds and points out a route of synthesizing bulk nanocomposites via nanoscale phase separation.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (57)
Show source-provided references
1. Giant magnetocaloric effect in Gd5Si2Ge210.1103/PhysRevLett.78.4494 ↗
2. Phase relationships and crystallography in the pseudobinary Gd5Si4‒Gd5Ge4 system10.1016/S0925-8388(97)00143-6 ↗
3. Polymorphism of Gd5Si2Ge2: the equivalence of temperature, magnetic field, and chemical and hydrostatic pressures10.1103/PhysRevB.71.174104 ↗
4. The room temperature metastable/stable relationships in the pseudo-binary Gd5Si4‒Gd5Ge4 system10.1016/S0925-8388(02)00226-8 ↗
5. Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2)10.1103/PhysRevLett.84.4617 ↗
6. Nanoscale zippers” in Gd5(SixGe1‒x)4: symmetry and chemical influences on the nanoscale zipping action10.1021/ic034941z ↗
7. Role of Ge in bridging ferromagnetism in the giant magnetocaloric Gd5(Ge1‒xSix)4 alloys10.1103/PhysRevLett.98.247205 ↗
8. Magnetic-field-induced structural phase transition in Gd5(Si1.8Ge2.2)10.1103/PhysRevB.58.R14721 ↗
9. On the nature of the magnetocaloric effect of the first-order magnetostructural transition10.1016/j.scriptamat.2011.12.042 ↗
10. Evidence for a short-range chemical order of Ge atoms and its critical role in inducing a giant magnetocaloric effect in Gd5Si1.5Ge2.510.1016/j.jallcom.2019.151751 ↗
11. Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1‒x)410.1103/PhysRevB.62.1022 ↗
12. Antiferromagnet-ferromagnet transitions in Ge-rich Gd5(SixGe4−x) alloys induced by composition, magnetic field, and temperature10.1103/PhysRevB.80.144401 ↗
13. Influence of oxygen on the giant magnetocaloric effect of Gd5Si1.95Ge2.0510.1016/j.jallcom.2005.06.001 ↗
14. Phase analysis of Gd5(SixGe1‒x)4 alloys prepared from different purity Gd with x = 0.475 and 0.4310.1016/j.actamat.2005.01.045 ↗
15. The giant magnetocaloric effect of optimally prepared Gd5Si2Ge210.1063/1.1558210 ↗
16. On the high-temperature phase transition of Gd5Si2Ge210.1021/ja048679k ↗
17. Uncovering the structure-property relationships in R5(SixGe4‒x) intermetallic phases10.1016/S0925-8388(02)00386-9 ↗
18. The effect of low temperature annealing on the structure of Gd5Si2Ge2 alloy10.1016/j.jallcom.2006.05.053 ↗
19. Effect of composition and cooling rate on the structure and magnetic entropy change in Gd5SixGe4‒x10.1063/1.1667852 ↗
20. Preparation of Gd5Si2Ge2 compounds using RF-induction10.1016/j.jnoncrysol.2008.06.123 ↗
21. Structure and phase transformation of melt-spun Gd5Si2Ge210.1016/j.tca.2006.04.003 ↗
22. Nanoscal zippers” in the crystalline solid. structural variations in the giant magnetocaloric material Gd5Si1.5Ge2.510.1021/cm020928l ↗
23. Microstructural analysis of twinned β-Gd5Si2Ge210.1103/PhysRevB.66.012106 ↗
24. TEM analysis of Gd5(SixGel‒x)4, where x=1/210.1016/S1359-6454(02)00227-6 ↗
25. TEM analysis of Gd5Si1.85Ge2.15 alloy10.1016/j.matchar.2007.10.005 ↗
26. Determination of phases in as prepared Gd5(SixGe1‒x)4, where x ≅ ½, Scrip
27. Identification of thin plates seen in R5(SixGe1‒x)4 alloys, where R is Gd, Tb, Dy, and Er10.1016/j.scriptamat.2005.03.052 ↗
28. Characterization of an atypical Widmanstätten structure in Gd5Si2Ge2 alloys10.1016/j.actamat.2005.04.009 ↗
29. Orientation and formation of atypical Widmanstätten plates in the Gd5(SixGe1‒x)4 system10.1016/j.actamat.2005.10.047 ↗
30. Linear microstructural features in R5(Si,Ge)4-type alloys: difficulties in identification10.1016/j.actamat.2007.10.009 ↗
31. Metamagnetism seeded by nanostructural features of single-crystalline Gd5Si2Ge210.1002/adma.200900093 ↗
32. Magnetic transitions and magnetocaloric effect of Gd4Nd1Si2Ge210.1016/j.jallcom.2020.154117 ↗
33. The effect of varying the crystal structure on the magnetism, electronic structure and thermodynamics in the Gd5(SixGe1‒x)4 system near x=0.510.1016/S0022-4596(02)00146-9 ↗
34. Phase separation by spinodal decomposition in isotropic systems10.1063/1.1695731 ↗
35. On the transition from short-range diffusion-limited to collision-limited growth in alloy solidification10.1016/0956-7151(94)90507-X ↗
36. Thermal stability of RE5(SixGe1‒x)3 plates in RE5(SixGe1‒x)4 alloys, where RE = Gd and Ho10.1016/j.intermet.2010.01.037 ↗
37. Defect structures in TaSi2 thin films produced by co-sputtering10.1016/S1359-6454(03)00034-X ↗
38. Training effects in Gd5Ge4: role of microstructure10.1088/0953-8984/18/26/020 ↗
39. Spinodal decomposition of a two-dimensional model alloy with mobile vacancies10.1016/0956-7151(91)90139-R ↗
40. Investigating phase transition temperatures of size separated gadolinium silicide magnetic nanoparticles10.1063/1.5007686 ↗
41. Managing hysteresis of Gd5Si2Ge2 by magnetic field cycling10.1063/1.5129660 ↗
42. Magnetic field induced phase transitions in Gd5Si1.95Ge2.05 single crystal and the anisotropic magnetocaloric effect10.1063/1.1556259 ↗
43. Griffiths-like behavior in Ge-rich magnetocaloric compounds Gd5SixGe1−x)410.1063/1.3467800 ↗
44. Griffiths-like phase of magnetocaloric R5(SixGe1−x)4 (R = Gd, Tb, Dy, and Ho)10.1103/PhysRevB.82.172406 ↗
45. Unusual magnetic behavior in Gd5Si1.5Ge2.5 and Gd5Si2Ge210.1103/PhysRevB.62.R14625 ↗
46. Magnetic-field and temperature dependencies of the electrical resistance near the magnetic and crystallographic first-order phase transition of Gd5Si2Ge210.1103/PhysRevB.60.7993 ↗
47. Anomalous behavior in electrical transport properties in single-crystal Gd5Si1.8Ge2.2 and polycrystalline Gd5Si2.09Ge1.9110.1109/TMAG.2009.2024123 ↗
48. Hall imaging of the history dependence of the magnetocaloric effect in Gd5Si2.09Ge1.9110.1109/TMAG.2008.2002595 ↗
49. A strain-driven morphotropic phase boundary in BiFeO310.1126/science.1177046 ↗
50. Large piezoelectric effect in Pb-free ceramics10.1103/PhysRevLett.103.257602 ↗
51. Nano-chessboard superlattices formed by spontaneous phase separation in oxides10.1038/nmat1953 ↗
52. Large Magnetostriction from morphotropic phase boundary in ferromagnets10.1103/PhysRevLett.104.197201 ↗
53. Morphotropic phase boundaries in ferromagnets: Tb1‒xDyxFe2 alloys10.1103/PhysRevLett.111.017203 ↗
54. Evidence for strain glass in the ferroelastic-martensitic system Ti50‒xNi50+x10.1103/PhysRevLett.95.205702 ↗
55. Direct evidence for local symmetry breaking during a strain glass transition10.1103/PhysRevLett.112.025701 ↗
56. Unprecedented non-hysteretic superelasticity of (001)-oriented NiCoFeGa single crystals10.1038/s41563-020-0645-4 ↗
57. Recent developments in magnetocaloric materials10.1088/0034-4885/68/6/R04 ↗