There are several journals and publications that focus on the solid-state aspects of Chemistry, which can be useful for the Chemistry optional subject for UPSC. These journals and publications provide in-depth research articles, reviews, and updates on various topics related to solid-state chemistry. Here are some notable ones:

1. bJournal of Solid State Chemistry:/b This journal covers all aspects of solid-state chemistry, including synthesis, structure, properties, and applications of solid materials. It publishes original research articles, reviews, and perspectives in the field.

2. bSolid State Sciences:/b This journal focuses on the fundamental and applied aspects of solid-state science. It covers a wide range of topics, including crystallography, materials science, and physical chemistry of solids.

3. bChemistry of Materials:/b This journal publishes articles on the synthesis, characterization, and applications of materials with a focus on their solid-state properties. It covers various topics such as organic-inorganic hybrids, nanomaterials, and functional materials.

4. bJournal of Materials Chemistry:/b This journal publishes research articles and reviews on the synthesis, characterization, and applications of materials. It covers various aspects of materials chemistry, including solid-state chemistry.

5. bCrystal Growth & Design:/b This journal focuses on the design, synthesis, and characterization of crystalline materials. It covers various topics such as crystal engineering, crystal growth, and crystallography.

6. bJournal of Physical Chemistry C:/b This journal covers the physical chemistry of materials, including their solid-state properties. It publishes articles on topics such as surface science, nanomaterials, and catalysis.

7. bChemical Communications:/b This journal publishes rapid communications and research articles in all areas of chemistry, including solid-state chemistry. It covers various topics such as synthesis, characterization, and applications of solid-state materials.

8. bJournal of Applied Physics:/b While not exclusively focused on solid-state chemistry, this journal publishes articles on the physics and applications of solid-state materials. It covers topics such as electronic, magnetic, and optical properties of materials.

These journals and publications provide a wealth of information and research in the field of solid-state chemistry. They can be invaluable resources for students preparing for the Chemistry optional subject for UPSC as they offer in-depth knowledge and insights into the solid-state aspects of Chemistry.