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Displaying records 951 to 960 of 1000 records.
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951. Coupling Between Octahedral Tilting and Ferroelectric Order in Tetragonal Tungsten Bronze-Structured Dielectrics
Topic: Ceramics
Published: Date unknown
Authors: Igor Levin, M Stennett, D I Woodward, A R West, I Reaney
Abstract: Strong coupling between local polar displacements and a commensurate octahedral tilting is proposed to explain the onset of classic ferroelectric behavior in tetragonal tungsten bronze-like dielectrics BaLaxNd1-xNb3Ti2O15. The ferroelectric phase tr ...

952. Crystal Chemistry and Microwave Dielectric Properties of Ba^d3^Mnb^d2-x^Sb^dx^O^d9^(M=Mg, NI, Zn)
Topic: Ceramics
Published: Date unknown
Authors: M W. Lufaso, E Hopkins, S M Bell, A Llobet
Abstract: The effect of Sb5+ substitution on the crystal chemistry and dielectric properties of Ba3MNb2-xSbxO9 (M = Mg, Zn, Ni) was investigated using a combination of X-ray and neutron powder diffraction, and dielectric property measurements at microwave freq ...

953. Crystal Structures, Modeling, and Dielectric Property Relationships of 2:1 Ordered Ba3MM 2O9 (M = Mg, Ni, Zn; M = Nb, Ta) Perovskites
Topic: Ceramics
Published: Date unknown
Author: M W. Lufaso
Abstract: The preparation, modeled and refined crystal structures, and structure-dielectric property relationships of five Ba3MM 2O9 (M = Mg, Ni, Zn; M = Nb, Ta) perovskites are reported. Crystal structure modeling was used to generate initial structure model ...

954. Crystallographic Data Sources
Topic: Ceramics
Published: Date unknown
Author: Vicky Lynn Karen
Abstract: Crystallography has a long and successful history of self-organization and was one of the first areas to create numerical scientific databases. Virtually all structure determinations have been archived in databases that allow ready access and comple ...

955. Crystallography and Crystal Chemistry of (Ba^d1-x^Sr^dx^)2TiO^d4^
Topic: Ceramics
Published: Date unknown
Authors: Winnie K Wong-Ng, James A Kaduk, Debra L Kaiser, Julia Frank
Abstract: This paper reports an investigation of the homogeneity range, crystal chemistry and crystallography of a technologically-important (Ba2-xSrx)TiO4 solid solution series. Since the end members of the series - Ba2TiO4 (Pnma (No.62)) and Sr2TiO4 (I4/mmm ...

956. Damage Assessment on Magnetic Hard Disks Due to Nanoasperity Impacts at Head-Disk Interface
Topic: Ceramics
Published: Date unknown
Authors: Tze-Jer Chuang, Stephen M. Hsu
Abstract: A 3D finite element model is constructed to simulate the local impact and its aftermath.For a given design of the disk structure with known elastic/plastic and damage properties as well as the slider s design with its surface texture, the model pred ...

957. Damage Maps for Impacts at a Multilayered Plate by a Rigid Nanoasperity
Topic: Ceramics
Published: Date unknown
Authors: Tze J Chuang, Stephen M. Hsu

958. Data and Informatics Needs in Biomaterials
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7255
Topic: Ceramics
Published: Date unknown
Author: C P Sturrock
Abstract: Biomaterials are nonviable materials used in medical devices, that are intended to interact with biological systems. In 2002 the total U.S. Medical device market stood at $77 billion, with global sales estimated at 2-3 times this figure. Approximatel ...

959. Defect Structures Produced in Silicon and MgO by Nanoindentation
Topic: Ceramics
Published: Date unknown
Author: B Hockey
Abstract: TEM has been used to characterize residual defect structures produced in {111} Si and {001] MgO by Berkovich nanoindentation at loads ranging from 5 mN to 0.1 mN. The plane-section observations provide a description of the primary defects, found to ...

960. Determining Crystal Habits From Oberservations of Planar Sections
Topic: Ceramics
Published: Date unknown
Authors: D M. Saylor, G S Rohrer
Abstract: A Method is described for reconstructing the crystal habit from the observations of many random planar sections of known orientation. We have generated simulated observations based on five different assumed crystal habits and found that it is possib ...

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