| Investigation of the Growth of Lead Magnesium Niobate - and Lead Zinc Niobate - Lead Titanate Solid Solution Single Crystals by the Bridgeman Technique |
30 MAY 2002 |
43 pages |
| Authors:
Robert S. Feigelson; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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 | During this program the following milestones were achieved: (1) Developed a method for synthesizing near pyrochlore-free PMNT starting material for crystal growth using the Columbite process and Pb3O4. Pyrochlore-free starting material prevents the crystals from sticking to the walls of the Pt crucibles and thereby prevents some forms of cracking. An another important development was the use of commercial magnesium niobate that reduced the number of processing steps and time ... |
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| Growth and Evaluation of Nonlinear Optical Crystals for Laser Applications: Lithium Borate, Barium Borate and Silver Gallium Selenide |
08 DEC 94 |
96 pages |
| Authors:
Robert S. Feigelson; Roger K. Route; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This report summarizes a four year program on the development of high efficiency nonlinear optical materials. Major achievements were the development of effective top-seeded solution growth techniques for beta-barium borate (BBO) and lithium triborate (LBO). BBO crystals were also grown for the first time in the US by the direct melt growth technique, a metastable method that leads to significantly higher growth rates than the commercial solution-growth technique. High quality ... |
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| Development of High Efficiency Nonlinear Optical Materials |
20 MAR 92 |
35 pages |
| Authors:
Robert S. Feigelson; Roger K. Route; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This report summarizes a five year program on the development of high efficiency nonlinear optical materials. A major objective of the program was the development of an effective crystal growth technology for barium borate (BBO) and lithium borate (LBO). A secondary objective was to grow high quality crystals to facilitate optical property determinations and nonlinear optical device development. A top-seeded solution growth technique for these two materials is described, along ... |
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| Growth and Evaluation of Nonlinear Optical Materials for Laser Applications: Barium Borate, Lithium Borate and Silver Gallium Selenide |
31 JAN 92 |
3 pages |
| Authors:
Robert S. Feigelson; Roger K. Route; Ekkes Brueck; N. H. Kim; H. Lee; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| A major goal of this program is to develop processes that industry can use to grow large high quality B-barium borate (BBO) and lithium triborate (LBO) crystals with good yield. High optical quality single crystals of both are currently being grown by modified top-seeded solution growth (TSSG) methods using sodium oxide and boric oxide, respectively, as solvents. This advanced TSSG growth technology has been transfered to both INRAD, Inc. and ... |
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| Mechanical Characterization of the Single Crystal Alpha-Al2O3 Fibers Grown by Laser-Heated Pedestal Technique |
91 |
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| Authors:
H. F. Wu; A. J. Perrotta; R. S. Feigelson; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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 | Preliminary experimental results on the mechanical properties of single crystal alpha-Al2O3 fibers grown by the laser-heated pedestal method are presented. The results show that single crystal alpha-Al2O3 fibers have comparable tensile mechanical properties to those of commercial high performance fibers, such as Kevlar-49, graphite AS-4, and S glass fibers useful for fiber/ matrix composites. |
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| Microstructural Interaction of Y2Ba4Cu8O16 Stacking Faults Within YBa2Cu3O(7-x) |
90 |
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| Authors:
A. F. Marshall; K. Char; R. W. Barton; A. Kapitulnik; S. S. Laderman; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| A transmission electron microscopy study of a post-annealed YBa2Cu3O(7-x) thin films shows that extra Cu-O planes within the structure can aggregate as stacking faults to form a defect microstructure rather than forming the well-ordered Y2Ba4Cu8O16 phase. Interaction of the stacking faults with the surrounding matrix results in strain effects and microstructural variations which may hinder ordering as well as influencing superconducting properties if occurring in higher concentration. When viewed normal ... |
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| Multilayered Composites Based on Ultrahigh Carbon Steel and Brass. |
1990 |
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| Authors:
O. D. Sherby; S. Lee; R. Koch; T. Sumi; J. Wolfenstine; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This paper concerned mmc in some important way and contained information about, utilized, or discussed these subjects: basic topics:, composite materials, data, mmc, mmc data materials and material types:, brass layers, brass/steel, laminates, steel layers, steel/brass material characteristics and data fields:, area reduction data, ductility, grain sizes, mechanical properties, microhardness data, strain hardening, stress-strain curves, stress-strain data, thickness, thickness data, yield strength parameter values relevant to the data:, 50%, 600 ... |
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| Phase Equilibrium and Crystal Growth Studies on AgGaSe2 and Related Nonlinear Optical Materials |
SEP 89 |
70 pages |
| Authors:
Robert S. Feigelson; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This report summarizes a 31 month research program carried out at the Center for Materials Research, Standford University. The principal objectives were 1) to improve the crystal growth technology for AgGaSe2 to facilitate the growth and yield of useful size nonlinear optical elements; 2) to gain an increased understanding of the optical scattering precipitates that form in melt-grown crystals; 3) to determine the cause of residual optical absorption remaining after ... |
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| A Study of Ferroelectricity in Single Crystal Compounds of the Type AFB5 and A3B2F12 |
OCT 88 |
23 pages |
| Authors:
Robert S. Feigelson; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| Phase relations in the PbF2/AIF3 binary system were studied in order to facilitate the preparation of single crystals of a reportedly high dielectric constant ternary ferroelectric phase. A phase diagram for the composition range 50 to 100 mole percent lead fluoride was developed and crystals of the incongruently melting Pb3A12F12 phase were grown using Bridgman growth techniques. A new inverted Bridgman method was developed to help induce melt convection during ... |
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| Research and Crystal Growth on High Dielectric Constant Materials for Millimeter Wave Applications |
05 JUN 87 |
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| Authors:
Robert S. Feigelson; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| The primary objective of this program was the growth of high quality single crystals for evaluation as potential candidates for electro-optic phase shifters in millimeter-wave applications. The research program was initially conceived as two parallel efforts. The first involved the application of new crystal growth techniques to the growth of strontium-barium titanate solid solutions. These materials are promising for the above applications but have been difficult to grow in the ... |
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| Development of Growth Techniques for Electromagnetic Crystals |
FEB 85 |
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| Authors:
R. S. Feigelson; R. K. Route; W. Kway; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| Techniques were developed for growth of single crystal fibers using a laser pedestal heating system. Oriented growth of refractory fibers was demonstrated for oxides, semi-conductors, and some metals. Since no crucible is used to contain the feed material, and only the tip of the pedestal material is melted, purity control is excellent. Controlled atmosphere growth and the design of retroreflectors to optimize laser power were investigation. This type of laser ... |
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| Research and Crystal Growth on High Dielectric Constant Materials for mm Wave Applications |
JUL 1984 |
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| Authors:
R. S. Feigelson; D. Elwell; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This program has as its major aim the growth of single crystals of ferroelectric materials for mm wave device applications. The material requirements for this application are a high dielectric constant and low losses. Large non-linear effects are associated with ferroelectric materials operated in the temperature range just above or just below the Curie point Tc, and materials such as BaTi03 and KTN have been evaluated for possible applications in ... |
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| Research and Crystal Growth on High Dielectric Constant Materials for mm Wave Applications |
NOV 1983 |
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| Authors:
R. S. Fiegelson; D. Elwell; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| The primary objectives of this program are to grow high-quality single crystals of materials which are candidates for electro-optic phase shifters at mm wavebands. The materials initially selected were the ferroelectric fluorides with the tetragonal SrA1F5 structure, BaxSr1-xTiO3 solid solutions, and CdIn2Te4. |
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| Preparation of Infrared Optic Fibers Using New Materials |
JUL 1983 |
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| Authors:
R. S. Feigelson; Roger K. Route; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This report summarizes an eighteen-month program on the preparation and characterization of optical fibers which have low losses and are transparent in the infrared range. The objectives were to study preparative techniques, compositional and optical properties, and factors which influence fiber growth techniques. The emphasis of this program was on single crystal fibers in the size range from 100 - 1000 micrometer diameter. Single crystal fibers were produced in limited ... |
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| Materials Research at Stanford University |
JUL 1982 |
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| Authors:
STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| Contents: Thrust Research Programs--Nondestructive Testing, Polymers, Novel Catalytic Materials, Metastable Materials, Fibers; Individual Research Programs. |
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| Preparation and Characteristics of Single Crystals and Epitaxial Layers of Silicon Carbide by Molten Salt Electrolysis |
SEP 1981 |
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| Authors:
T. H. Geballe; R. S. Feigelson; D. Elwell; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| Thin layers of SiC were electrodeposited from Li2CO3/SiO2 melts onto alpha-SiC substrates at 1000 - 1050 C using potential differences around -0.5V versus polycrystalline SiC anodes. The layers appear to be expitaxial. Although conditions were found under which the melt exhibited good long term stability, attempts to grow bulk SiC crystals were handicapped by delamination of the seed crystals. Attempts to electrodeposit SiC from K2SiF6/Li2CO3/LiF/KF and SiO2/ Na2CO3/NaBO2/LiF melts yielded ... |
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| Materials Research at Stanford University, 1 July 1980-30 June 1981 |
JUL 1981 |
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| Authors:
STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| This Twentieth Annual Report includes the total research activity related to the science of materials at Stanford University during the period July 1, 1980 through June 30, 1981. It contains brief descriptions of research programs active during this period. The report of the research programs is organized into two groupings: (1) the research programs of CMR Members who have participated in one of the five major Thrust group programs supported ... |
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| Long Range Materials Research. Supplement 1. Investigation of Luminescence from Trapped Excitons in CsI |
JAN 1977 |
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| Authors:
Akinola Mauritala Salau; Clayton W. Bates Jr; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| It is well known that normally pure alkali halide crystals (AHC) show the so-called intrinsic luminescence at low temperatures when excited by both ionizing radiations (like chi, beta, or gamma-rays) and nonionizing ultra-violet radiations. Excitations are usually limited to the absorption bands of the intrinsic exciton (electron-hole pair bound together by their Coulombic interactions) as well as to band-to-band transitions. |
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| Long Range Materials Research. Supplement 2. Excitonic Emission from CsI(Na) |
JAN 1977 |
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| Authors:
Olive Lee Hsu; Clayton W. Bates Jr; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
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| Photoluminescence in CsI(Na) was studied. This work used non-ionizing light sources and obtained the data from well-annealed, zone-refined specimens. A series of absorption excitation and emission spectra were measured at temperature between 300 K and 4.2 K. There are strong absorption bands on the long wavelength side of the fundamental absorption edge of the host CsI crystal. The excitation spectra are closely related to the absorption bands. The emission spectra ... |
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| Long Range Materials Research. Appendix 1. Synthesis and Characterization of Supported Organometallic Rhodium (I) Catalysts |
30 JUN 1974 |
109 pages |
| Authors:
Donald Nilan Marquardt; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
|
| This thesis deals with the continuing effort to chemically bind well defined homogeneous organometallic catalysts on the surface of the inert support and to study their behavior. The work has shown that a chelating bisphosphine ligand (2-(3-triethoxysilylpropyl)-1,3-bis(diphenylphosphino)propane) can effectively support and immobilize an organometallic Rh(I) hydrogenation catalyst on a silica surface. Through a series of tests, this bound hydrogenation catalyst behaves in a manner expected of an analog of homogeneous ... |
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| New Superconductors |
MAR 1972 |
122 pages |
| Authors:
James P. Collman; William A. Little; STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
|
| The report covers work on the study of possible high temperature superconductors. It describes theoretical work on filamentary organo-metallic materials - the conduction mechanism, band theory and screening; progress towards the synthesis of metallic chain compounds and related organo-metallic complexes, and experimental studies of their solid state properties. The research projects described include the following: Synthesis of a rhodium bis(diacetylmonoximeimino)propane compound; Synthesis of (metal-carbonyl) tin hydrides and (metal-carbonyl) di tin ... |
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| ANNUAL REPORT ON MATERIALS RESEARCH AT STANFORD UNIVERSITY (6TH), JULY 1, 1966, TO JUNE 30, 1967 |
DEC 1967 |
226 pages |
| Authors:
STANFORD UNIV CA CENTER FOR MATERIALS RESEARCH
|
| The report contains brief descriptions of the various individual research programs active during the reporting period, arranged alphabetically by the name of the principal investigator. Also included are lists of publications, doctoral dissertations, faculty and senior staff members, research associates, graduate students and degrees awarded. A name index is included for convenience in locating references to the activities of specific individuals. |
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