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2006

Mechanical Engineering

Retrospective Theses and Dissertations

Materials science and engineering

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The Nature Of The Distinctive Microscopic Features In R5(Si[Subscript X]Ge[Subscript 1-X])4 Magnetic Refrigeration Materials , Ozan Ugurlu Jan 2006

The Nature Of The Distinctive Microscopic Features In R5(Si[Subscript X]Ge[Subscript 1-X])4 Magnetic Refrigeration Materials , Ozan Ugurlu

Retrospective Theses and Dissertations

Magnetic refrigeration is a promising technology that offers a potential for high energy efficiency. The giant magnetocaloric effect of the R5(Six,Ge1-x)4 alloys (where R=rare-earth and 0≤x≤1), which was discovered in 1997, make them perfect candidates for magnetic refrigeration applications. In this study the microstructures of Gd5(SixGe1-x)4 alloys have been characterized using electron microscopy techniques, with the focus being on distinctive linear features first examined in 1999. These linear features have been observed in R5(Six,Ge1-x) 4 alloys prepared from different rare-earths (Gd, Tb, Dy and Er) with different crystal structures (Gd5Si4-type ...