Silicate is Sarah's lab note 3 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission Afraid Of A Little Competition?, so it can't be missed.
Sarah vents about Weaver, a rival scientist, then logs how she will use the silicate. She admits Deacon wants things back how they were, and she can't see how.
Deacon's Alive???
Deacon's Alive??? is Sarah's lab note 1 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission A War We Can Win, so it can't be missed.
Riding With Deacon
Riding With Deacon is Sarah's lab note 4 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission Just Another Acquisition Form, so it can't be missed.
Sarah's Lab Notes
Sarah's Lab Notes are six personal research notes written by Sarah Whitaker. They are rewards for main story missions in Crater Lake, so you get them just by playing on.
Teensy Tabby
Teensy Tabby is Sarah's lab note 6 of 6, a short audio log she records on Wizard Island. You get it automatically during the story mission This Could Be It, so it can't be missed.