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Article
Magnetic and Microstructural Aspects of the Bulk Metallic Glassy Materials Nd60Fe30Al10
The ferromagnetic bulk metallic glass (BMG) Nd60Fe30Al10system exhibits extremely large coercivities at low temperature and moderate coercivities near room temperature. The magnetic hardness, as best evidenced by...
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Article
The Pr-rich portion of the Ni-Pr system
The Ni-Pr phase diagram on the Pr-rich side was revised using differential thermal analysis, differential scanning calorimetry, and scanning electron microscopy. The existence of four stoichiometric compounds, Ni
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Chapter
Composite Magnetostrictive Materials For Advanced Automotive Magnetomechanical Sensors
The need for non-contact torque sensors has sparked considerable interest in develo** new magnetomechanical sensor materials [1, 2, 3, 4, 5]. Highly magnetostrictive materials, such as Terfenol (Tb0.3Dy0.7Fe2) ...
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Article
Effects of Quenching Environment on the Structure of Melt- Spun Nd2Fe14B
Melt-spun Nd2Fe14B (2-14-1) ribbons were produced under active vacuum and different partial pressures of inert gases of Ar and He. Microstructure and thermal analyses were performed to understand the microstructu...
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Article
Chemical Ordering and Microstructural Affects on Magnetic Properties of Sm2Fe17 and Sm2Fe17Nx
The effect of chemical order and defect structure on the magnetization process in Sm2Fe17 and Sm2Fe17Nx has been investigated. In Sm2Fe17, chemical disorder results in the development of random anisotropy and a s...
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Article
Specific Heat of YBa2Cu3O7−−δ and (La2−xSrx)CuO4: Evidence for d-Wave Pairing
New low-temperature specific-heat data for YBa2Cu3O7−δ, 0≤δ≤0.2, and (La1.85Sr0.15)CuO4 in magnetic fields (H) to 9 T are reported. They show features predicted for the lines of nodes in the energy gap that are e...
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Chapter
Influence of Alloying on the Behavior and Properties of Er3Ni
A study on processing and alloying of the passive magnetic regenerator material Er3Ni revealed that the cooling rates of the order of 106 K/sec are insufficient to quench it into a glassy state. Small additions o...
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Chapter and Conference Paper
Phase Relationships and Cation Disorder in RE1+xBa2-xCu3O7+δ, RE = Pr, Nd, Sm, Gd
Unlike Y123 which forms only a stoichiometric compound, the light rare earth elements (LRE) form a solid solution LRE1+xBa2-xCu3O7+δ (LRE123ss), with increasing substitution of the LRE3+ for the Ba2+ as the ionic...
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Article
Understanding the phase relations and cation disorder in LRE1+xBa2− xCu3O7+δ
Unlike Y123 which forms only a stochiometric compound, the light rare earth elements (LRE) form a solid solution LRE1+xBa2-xCu3O7+δ (LRE123ss), with increasing substitution of the LRE3+ for the Ba2+ with increasi...
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Article
Enhanced superconductivity in Nd1+xBa2-xCu3O7+δby low oxygen partial pressure annealing
Previous work has shown that unlike YBa2 Cu3 O7-δ (Y123), the Nd-Ba-Cu-O system exhibits a solid solution Nd1+xBa2-x Cu3O7+δ (Nd123ss) for 0.04≤ × ≤0.6.1–3) An earlier paper showed that although the superconducti...
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Article
Effects of oxygen partial pressure on the crystallization of amorphous Bi–Sr–Ca–Cu–O and Bi–Sr–Ca–Cu–O + Ag
The temperatures and pathways of crystallization for amorphous Bi–Sr–Ca–Cu–O are strongly dependent on oxygen partial pressure (Po2), the oxidation state of the glass, and the presence of Ag. Reducing the Po2 fro...
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Article
Recrystallization of Amorphous or Nanocrystalline NdBa2Cu3O7-x and GdBa2Cu3O7-x
Using a novel melt-spinning technique, we have produced highly disordered NdBa2Cu3O7-x and GdBa2Cu3Oy-x materials. Samples which were melt-spun in an O2 environment consist of nanocrystals with the tetragonal REB...
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Article
Melt-spin processing of YBa2Cu3O7−x
We introduce a novel containerless melt-spin processing technique for YBa2Cu3O7−x using prereacted oxide powders that are rapidly melted and subsequentially quenched in a controlled atmosphere. This results in fl...
