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Featured researches published by Helmut Thomann.


Journal of Applied Physics | 1987

Excimer‐laser‐induced etching of ceramic PbTi1−xZrxO3

M. Eyett; D. Bäuerle; Wolfram Wersing; Helmut Thomann

The etching of ceramic PbTi1−xZrxO3 (PZT) by XeCl excimer laser radiation has been investigated. In air, the threshold fluence for etching was about 2 J/cm2. At fluences of 10 J/cm2, etch rates of 0.1 μm/pulse were observed. The geometry of etched structures can readily be defined by choosing suitable experimental conditions, suggesting potential applications of this process to the production of devices.


Applied Physics A | 1986

Laser-induced chemical etching of ceramic PbTi1−xZrxO3

M. Eyett; D. Buerle; Wolfram Wersing; K. Lubitz; Helmut Thomann

The laser-induced etching of ceramic PbTi1−xZrxO3 in a hydrogen atmosphere and in air has been investigated. Visible Ar+ and Kr+ laser radiation was employed in most of the experiments. In H2 atmosphere, regular patterning of the ceramic is possible. Average etch rates reach up to about 250 μm/s.


Archive | 1971

Piezo-electric motor

Christian Cobarg; Erich Fenner; Max Guntersdorfer; Walter Heywang; Franz Otto; Rudolf Schofer; Helmut Thomann


Archive | 1980

Method of producing plate- or tape-shaped silicon crystal bodies having crystalline pillar-like structures therein, equivalent to _crystalline columnar structures, for large surface solar cells

Christa Grabmaier; Franz Otto; Helmut Thomann


Archive | 1988

Process utilizing catalytic material for the reduction of nitrous oxides

Helmut Schmelz; Helmut Thomann; Renate Kuschke; Eva-Helga Wilbert; Wolfgang Gajewski; Josef Sprehe; Norbert Landgraf; Hans Dr Rer Nat Ranly; Lothar Balling; Richard Reppisch; Dietmar Hein


Archive | 1989

Sold electrolyte high temperature fuel cell - has cell formed with plates with slots for passage of oxygen and gases

Heribert Prof Dr Oel; Helmut Thomann; M. Erve


Archive | 1988

Method for working members composed of oxide material

Dieter Prof Dr Baeuerle; Michael Dipl Phys Eyett; Helmut Thomann; Wolfram Wersing


Archive | 1990

Catalyst system esp. for removal of nitrogen oxide(s) - by redn. with ammonia, has two catalysts of differing optimal operating temps.

Helmut Dr Rer Nat Schmelz; Helmut Thomann; Lothar Balling; Wolfgang Dr. Dipl.-Phys. Gajewski; Dietmar Hein; Norbert Landgraf; Josef Sprehe


Archive | 1977

Method of detecting high energy radiation via a bismuth oxide compound

Helmut Thomann; Christa Grabmaier


Advanced Materials | 1993

Printed materials. Concise encyclopedia of semiconducting materials & related technologies. Edited by S. Mahajan, L. C. Kimerling, Pergamon Press, Oxford 1992, 582 pp., hardcover, £ 130, ISBN 0-08-034724-X

Helmut Thomann

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