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Displaying 1 - 25 of 29

Colored Oxides with Hibonite Structure: A Potential Route to Non-cobalt Blue Pigments

December 1, 2016
Author(s)
Jun Li, Elena A. Medina, Judith K. Stalick, Arthur W. Sleight, M. A. Subramanian
The crystal structure of hibonite with an ideal formula CaAl 12O 19 is hexagonal P6 3/mmc, isostructural with magnetoplumbite. Natural and synthetic hibonites have been widely studied for their formation, compositions, crystal structures, properties and

From Serendipity to Rational Design: Tuning the Blue Trigonal Bipyramidal Mn 3+ Chromophore to Violet and Purple through Application of Chemical Pressure

October 1, 2016
Author(s)
Jun Li, Simon Lorger, Judith K. Stalick, Arthur W. Sleight, M. A. Subramanian
We recently reported that an allowed d-d transition of trigonal bipyramidal (TBP) Mn 3+ is responsible for the bright blue color in the YIn 10xMn xO 3 solid solution. The crystal field splitting between a'(d z2) and e'(d x2'y2, D xy) energy levels is very

Crystal Structures and Phase Equilibria in the Hafnium-Palladium System

August 1, 2016
Author(s)
Judith K. Stalick, Richard M. Waterstrat
Portions of the Hf-Pd phase diagram have been reinvestigated in an attempt to resolve contradictions that occur between two previous studies. Techniques employed include Rietveld refinement using x-ray and high-temperature neutron diffraction data to

Structural Studies of CaAl 12 O 19 , SrAl 12 O 19 , La 2/3+dAl d12-dO 19 , and CaAl 10 NiTiO 19 with the Hibonite Structure; Indications of an Unusual Type of Ferroelectric

March 1, 2016
Author(s)
Jun Li, Elena A. Medina, Judith K. Stalick, Arthur W. Sleight, M. A. Subramanian
Various oxides with the hibonite structure were synthesized and structurally analyzed using powder neutron diffraction. The structure of CaAl 12O 19 at 298 K and 11 K shows dipoles that are apparently too dilute to order unless subjected to a suitable

True Composition and Structure of Hexagonal "YAlO 3 ", Actually Y 3 Al 3 O 8 CO 3

February 2, 2015
Author(s)
Jun Li, Andrew E. Smith, Peng Jiang, Judith K. Stalick, Arthur W. Sleight, M. A. Subramanian
The discovery of a brilliant blue color on introduction of Mn 3+ into the trigonal bipyramidal (TBP)sites in YInO 3 has led to a search for other hosts for Mn 3+ in TBP coordination. An obvious choice would be YAlO 3. This compound, which has only been

The Hafnium-Platinum Phase Diagram

February 1, 2014
Author(s)
Judith K. Stalick, Richard M. Waterstrat
Phase relationships were determined in the Hf-Pt system at temperatures up to 1690°C using both metallographic and neutron Rietveld refinement techniques. An unusual displacive transformation is observed 200 °C in the rhombohedral compound Hf 3Pt 4

An Ordered Metallic-Glass Solid-Solution Phase That Grows From the Melt Like a Crystal

January 1, 2014
Author(s)
Lyle E. Levine, Karena Chapman, Leonid A. Bendersky, Gabrielle G. Long, John W. Cahn, Peter Chupas, Judith K. Stalick, Frederic Mompiou
We used high-energy synchrotron-based X-ray scattering to investigate the structure of an isotropic AlFeSi metallic glass that nucleates and grows from the melt during rapid cooling like a crystal. The glass is a noncrystalline homogeneous metastable phase

A highly ordered non-crystalline metallic phase

July 5, 2013
Author(s)
Gabrielle G. Long, Karena Chapman, Peter Chupas, Leonid A. Bendersky, Lyle E. Levine, Frederic Mompiou, John W. Cahn, Judith K. Stalick
We report the characterization of an ordered non-crystalline isotropic metallic solid that, during rapid cooling of an Al-Fe-Si melt, forms by nucleation, followed by growth along a moving interface between the solid and melt with partitioning of the