Engineering topics
Publications and source records attributed to Prewitt, C. T..
The synthesis and characterization of Fe-bearing phase E and phase E' demonstrate that the phase E-type structures can be rather compliant and complex, and that as we further explore the temperature-pressure-composition space, other types of structures that are similar to or related to the structure of phase E may be discovered.
Four phases are observed in superconducting Bi-Ca-Sr-Cu-O samples. The superconducting phase, with onset temperature near 120 K, is a 15.4-A-layered compound with composition near Bi2Ca1Sr2Cu2O9 and an A-centered orthorhombic unit subcell 5.41 x 5.44 x 30.78 A. X-ray diffraction and electron microscopy data are consistent with a structure of alternating perovskite and Bi2O2 layers. High-resolution transmission electron microscopy images reveal a b-axis superstructure of 27.2 A, numerous (001) stacking faults, and other defects.
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Apollo 12 clinopyroxenes exsolution and epitaxy by electron microprobe and single crystal X ray diffraction
High temperature phase transition and composition of Apollo 12 pigeonite/augite clinopyroxene crystal rock 12021 from X ray diffraction
Clinopyroxenes from Apollo 12 rocks studied by X ray diffraction and electron microprobe methods, noting phenocrysts, chemical composition and crystallization