Crystals and glasses, while often appearing similar, possess fundamentally different internal structures. Crystals feature a highly ordered atomic arrangement, whereas glasses are characterized by a disordered, fluid-like state. The nature of glasses, which straddle the properties of solids and liquids, has long eluded precise scientific classification.
The newly identified Bragg glass phase exhibits both the ordered properties inherent to crystals and the amorphous qualities of glass. Researchers from the U.S. Department of Energy's Argonne National Laboratory, along with partners at Cornell and Stanford Universities, detected this phase through sophisticated data analysis methods.
Utilizing a machine learning tool developed at Cornell, named X-ray temperature clustering, the team analyzed extensive data from X-ray scattering experiments to uncover characteristics indicative of the Bragg glass phase. This research not only deepens the scientific community's understanding of glass-like materials but also underscores the power of machine learning in unraveling the complexities of material science.
"We can collect massive amounts of X-ray data in short periods of time, and analyzing the data manually can make it impossible to see the forest for the trees," explained Ray Osborn, a senior physicist at Argonne and a study co-author. "This technology combination revealed a unique signature of the Bragg glass phase."
The study focused on a crystal known as ErTe3, modified by introducing palladium atoms to create disorder. This method simulates conditions theorized decades ago to possibly host Bragg glass states in charge density wave (CDW) materials. The Advanced Photon Source at Argonne, a DOE Office of Science user facility, was instrumental in this research, allowing precise measurements of atomic arrangements.
Matthew Krogstad, an assistant physicist at Argonne, noted the paradoxical nature of Bragg glass: "It combines the sharp Bragg peaks typical of perfect crystals with the broader, diffuse patterns observed in glasses, presenting both types of features simultaneously."
The findings not only confirm the theoretical existence of Bragg glass in disordered CDW materials but also pave the way for designing new materials with tailored properties for various applications, from electronics to nuclear waste management.
Research Report:Bragg glass signatures in PdxErTe3 with X-ray diffraction temperature clustering
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