Structural, Transport, and Magnetic Characterization of NiZr Metallic Glasses with varied Ni/Zr composition
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Structural, Transport, and Magnetic Characterization of NiZr Metallic Glasses with varied Ni/Zr composition A. F. Isakovic1, S. D. Sulejmanovic2, T. P. Mihac2, K. Evans-Lutterodt3 1
Khalifa University of Science, Technology and Research, Abu Dhabi, PO 127788, UAE University of Sarajevo, Zmaja od Bosne 33-35, 71000 Sarajevo, Bosnia and Herzegovina 3 Brookhaven National Laboratory, Upton, New York, 11973-5000, USA 2
ABSTRACT Three families of NixZry (x = 28, 36, 38, x + y = 100%) metallic glasses were prepared and examined using X-ray, temperature dependent transport and magnetic field. X-ray characterization shows characteristic diffuse spectrum, except for narrow regions of control samples, where partial crystallization was induced in finite small volumes. Magnetic properties confirm spin-fluctuating paramagnetic-like behavior, which we asses from preliminary Hall coefficient measurements, which is quantitatively different in three sample families. Temperature dependent AC and DC transport measurements were conducted in a broad temperature range from 70 K to 700 K, finding both quantitative and semiqualitative differences between samples with different Ni/Zr ratio. INTRODUCTION Metallic glasses are amorphous metals that rarely, if ever, occur in nature, and represent a class of composite materials which are investigated because they offer a promise of qualitatively and quantitatively different elastic properties, including better Young modulus and qualitatively different shearing process [1]. They are also considered very useful in various sensors and actuators [2, 3]. From a standpoint of fundamental condensed matter physics, a binary system with a variable atomic percentage ratio is relevant because it allows for detailed studies of the suggested correlation between the variable density of the hot metallic liquid alloy and the threshold for a real glass forming liquid [3]. Exciting possibility exists in the application of such materials for fabrication of highly flexible cantilevers for SEM (scanning electron microscopy) and, with some modifications, for soft-matter surface probe microscopy. On the development front, the NiZr class of binary metallic glasses represents a material whose pair-distribution function has not been fully determined yet, and the early studies conducted by these authors indicate that there exist unusual variations in interatomic distances in this class of materials, which would further support the assertion that there exist strong possibilities for controlling bond lengths and electronic interactions on the lower end of the Ni solubility range. EXPERIMENT Our project is a part of the research efforts into slower cooling rates and larger cross sections of metallic glasses. Following a long tradition of flash cooling methods, we find our inspiration in the work of Inoue and coworkers [1], whose group studied Zr65Al7.5Ni10Cu17.5
system. Knowing that some of the criteria for glass-forming ability are based on atomic sizes and chemical interactions, also associated with deep eutectics, we l
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