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  1. No Access

    Article

    A Novel X-ray Micro-diffraction Approach for Structural Characterization of Trace Quantities of Secondary Phases in Al2O3-C/Fe System

    Sessile drop investigations were carried out on Al2O3-12.9C refractory substrates in contact with molten iron at 1823 K (1550 °C) for 30 minutes. Chemical reactions in this system resulted in the generation of tr...

    M. Ikram-ul-Haq, R. Khanna, Y. Wang… in Metallurgical and Materials Transactions B (2014)

  2. No Access

    Article

    Chemical Interactions of Alumina–Carbon Refractories with Molten Steel at 1823 K (1550 °C): Implications for Refractory Degradation and Steel Quality

    A sessile-drop study was carried out on Al2O3-10 pct C refractory substrates in contact with molten iron to investigate possible chemical reactions in the system and to determine the influence of carbon and the r...

    R. Khanna, M. Ikram-Ul Haq, Y. Wang… in Metallurgical and Materials Transactions B (2011)

  3. No Access

    Article

    High Temperature Stable Contacts for GaN HEMTs and LEDs

    There is continued interest in develo** more stable contacts to a variety of GaN-based devices. In this paper we give two examples of devices that show improved thermal stability when boride, nitride or Ir d...

    S. J. Pearton, L. F. Voss, R. Khanna, Wantae Lim… in MRS Online Proceedings Library (2009)

  4. No Access

    Article

    Thermal Stability of Nitride-Based Diffusion Barriers for Ohmic Contacts to n-GaN

    The use of TaN, TiN, and ZrN diffusion barriers for Ti/Al-based contacts on n-GaN (n ∼ 3 × 1017 cm−3) is reported. The annealing temperature (600–1,000°C) dependence of the Ohmic contact characteristics using a T...

    L.F. Voss, L. Stafford, R. Khanna, B.P. Gila… in Journal of Electronic Materials (2007)

  5. No Access

    Article

    Ir/Au Ohmic Contacts on Bulk, Single-Crystal n-Type ZnO

    Purpose: Need for reliable, thermally stable Ohmic metallizations for ZnO. Because of difficulties with current common contact metals, there exists a heavy desire for metals with high melting temperatures and ...

    J. S. Wright, R. Khanna, L. Stafford, B. P. Gila… in MRS Online Proceedings Library (2007)

  6. No Access

    Article

    Development of Thin Film and Nanorod ZnO-Based LEDs and Sensors

    The development of new etching and contact metallurgies for the ZnO/ZnMgO/ZnCdO materials system and various approaches for realizing ZnO LEDs are reviewed. ZnO nanorod MOSFETs and pH sensors have been demonst...

    Stephen J. Pearton, L. C. Tien, H. S. Kim, D. P. Norton… in MRS Online Proceedings Library (2007)

  7. No Access

    Article

    Influence of chemical compositions of slag and graphite on the phenomena occurring in the graphite/slag interfacial region

    Silica reduction reactions taking place in the slag/carbon interfacial region were investigated for synthetic/natural graphite in the temperature range 1500 °C to 1700 °C. Two silica-rich blast furnace slags, ...

    V. Sahajwalla, R. Khanna, A. S. Mehta Ph.D. in Metallurgical and Materials Transactions B (2004)

  8. No Access

    Article

    A monte carlo simulation study of dissolution of graphite in iron-carbon melts

    A Monte Carlo (MC) simulation study has been carried out on the dissolution of graphite in Fe-C melts in the temperature range 1300 °C to 1600 °C. Atoms in graphite and iron melt were arranged on a rigid graph...

    V. Sahajwalla, R. Khanna in Metallurgical and Materials Transactions B (2000)

  9. No Access

    Article

    A Novel Integrated MEMS Process Using Fluorocarbon Films Deposited With a Deep Reactive Ion Etching (DRIE) Tool

    Fluorocarbon films are useful as antistiction films for suspended structure and also for electrical isolation purposes. Furthermore, due to their low dielectric constant and ease of deposition they are useful ...

    A. A. Ayón, D. Z. Chen, R. Khanna, R. Braff, H. H. Sawin… in MRS Online Proceedings Library (1999)