| High Dielectric Constant Ceramics in the PbSc(0.5)Ta(0.5)O3-PbZrO3 and PbSc(0.5)Ta(0.5)O3-PbTiO3 Systems |
93 |
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| Authors:
P. C. Osbond; R. W. Whatmore; GEC-MARCONI MATERIALS TECHNOLOGY LTD TOWCESTER (UNITED KINGDOM)
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 | The properties of (1-x)PbSc(0.5)Ta(0.5)O3-(x)PbZrO3 ceramics (0.075< x< 0.2), have been investigated using three different mixed oxide preparation routes. These were (i) a single-stage calcination (at 900 C) between lead, scandium, tantalum and zirconium oxides, (ii) the reaction between single phase PbSc(0.5)Ta(0.5)O3 and PbZrO3 powders (also at 900 C), and (iii) the formation of zirconium-modified scandium tantalate (via a high temperature prereaction stage) prior to calcination with lead oxide. It was ... |
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| Single-Sideband Modulator in GaAs Integrated Optics for Microwave Frequency Operation, |
APR 1992 |
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| Authors:
Michael J. Wale; Robert G. Walker; Colin Edge; K. Brown-Goebeler; GEC-MARCONI MATERIALS TECHNOLOGY LTD TOWCESTER (UNITED KINGDOM)
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| We describe the first experimental realization of an integrated optical single sideband modulator operating at microwave frequencies (10-14 GHz). |
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| Diamond Layers for the Protection of Infrared Windows. |
1992 |
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| Authors:
David A. Tossell; Mark C. Costello; Crofton J. Brierley; GEC-MARCONI MATERIALS TECHNOLOGY LTD TOWCESTER (UNITED KINGDOM)
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| In comparison with presently available LWIR (8-12 micron) window materials, diamond has unsurpassed optical and thermomechanical properties. However, the manufacture of bulk diamond optical components is still in its infancy and many years effort are required to develop the technologies necessary to the fabrication of large windows and domes. In the short term the coating of current LWIR materials (particularly ZnS) with a protective layer of polycrystalline diamond would result ... |
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| Thin Ferroelectric Films for Thermal Detector Applications, |
05 APR 1991 |
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| Authors:
F. Ainger; A. Patel; N. M. Shorrocks; C. Trundle; R. W. Whatmore; GEC-MARCONI MATERIALS TECHNOLOGY LTD TOWCESTER (UNITED KINGDOM)
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| The deposition of thin films of lead scandium tantalate (Pb(Sc1/2Ta1/2)O3) have been investigated by two processing routes. n he first, progress is reviewed for chemical vapour deposition in a purpose built low pressure reactor, utilising suitable modified proprietary precursors. Deposition has been studied over the temperature range 400-8000C and, in general, amorphous films result which convert to crystalline perovskites on subsequent annealing. However, inclusion of hydroxy compounds in the vapour ... |
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