Bernd Schonfeld

Title: Bernd Schonfeld: Innovator in Chlorofluoroferrates and Phosphor Technologies

Introduction

Bernd Schonfeld is a notable inventor based in Bad Nenndorf, Germany. He has made significant contributions to the field of materials science, particularly in the development of chlorofluoroferrates and phosphor technologies. With a total of three patents to his name, Schonfeld's work has implications in various industrial applications.

Latest Patents

Among his latest patents, Schonfeld has developed a process for the manufacture of chlorofluoroferrate(II,III). This innovative process involves fusing alkali metal halides or ammonium halides with iron(III) halide and metallic iron. The starting materials include alkali metal chloride or ammonium chloride, alkali metal fluoride or ammonium fluoride, anhydrous iron(III) chloride, and iron powder. The reaction occurs at temperatures ranging from 300 to 900 degrees Celsius. The resulting chlorofluoroferrates exhibit markedly lower hygroscopicity compared to traditional chloroferrates, making them particularly suitable as active fillers for grinding wheels.

Another significant patent involves the preparation of a red emitting phosphor coated with red filter materials. This process entails coating phosphor particles, which emit red light when excited by cathode rays, with red iron oxide. A thin layer of pyrite is first produced on the phosphor particles, which is then converted into hematite. This method results in a uniform, dense pigment layer that adheres strongly to the surface of the phosphor particles. The filter phosphors produced through this technique are utilized in cathode ray tubes, especially in color picture tubes.

Career Highlights

Bernd Schonfeld is associated with Riedel-de Haen Aktiengesellschaft, a company known for its innovative chemical products. His work at the company has allowed him to focus on advancing materials that have practical applications in various industries.

Collaborations

Throughout his career, Schonfeld has collaborated with notable colleagues such as Rudolf Hirschberg and Karl Franz. These collaborations have contributed to the development of his patented technologies and have fostered innovation within the field.

Conclusion

In summary, Bernd Schonfeld is a distinguished inventor whose work in chlorofluoroferrates and phosphor technologies has made a significant impact in materials science. His innovative patents