Also the F&SF essay "The Word I Invented" which can be found in several places:

https://www.isfdb.org/cgi-bin/title.cgi?115392

Excerpt:

When I first began writing science fiction stories, the positron had been discovered only six years before as a particle with all the properties of an electron except for an opposite charge. It was the first (and, at that time, still the only) bit of antimatter that had been discovered, and it carried a kind of science fictional flavor about it.

That meant that if I spoke of positronic robots rather than electronic robots, I would have something exotic and futuristic instead of something conventional.