Chapters / Sources
Sources and checks
How the handwriting was read, what was verified online, and what was corrected.
Every page was transcribed from the rendered PDF pages first, then checked. Where the handwriting and the standard source disagreed, the site keeps the standard result and says what the notes said.
What was transcribed
The uploaded PDF, PDF_Gallery_20261115_202140.pdf, 23 pages of handwritten notes. Page 11 is a duplicate photograph of page 10, so it adds no new topic. The single photograph you sent in chat is page 23 of that PDF.
What was checked, and where
| Claim in the notes | Result | Source |
|---|---|---|
| Normal spinel: A2+ in 1/8 Td, B3+ in 1/2 Oct; inverse: B(AB)O4 | Correct | LibreTexts, Spinel, Perovskite, and Rutile Structures |
| Site selection governed by relative CFSE in Oct and Td holes | Correct — the standard explanation for transition-metal oxide spinels | LibreTexts, Spinel, Perovskite, and Rutile Structures |
| OSPE: d3/d8 0.84, d4/d9 0.42, d2/d7 0.27, d1/d6 0.13, d0/d5/d10 0 (Δo) | Correct, high spin, Δt = 4/9 Δo | LibreTexts, Octahedral vs. Tetrahedral Geometries |
| Goldschmidt t: >1 hexagonal/tetragonal, 0.9–1 cubic, 0.71–0.9 orthorhombic/rhombohedral, <0.71 other | Correct; the notes’ 0.8 / 1.05 limits are a classroom approximation | Wikipedia, Goldschmidt tolerance factor |
| Perovskite: Ca corners, O face centres, Ti body centre; Ti CN 6, Ca CN 12 | Correct | Wikipedia, Perovskite; University of Sydney, CHEM1902 2007-N-6 |
| Ilmenite FeTiO3, corundum-type, 2/3 of octahedral holes filled | Correct, with Fe2+ (not Fe3+ as one crossed-out word suggested) | LibreTexts / standard corundum description |
| Radius ratios 0.225 / 0.414 / 0.732 | Correct | LibreTexts, Structures of Simple Binary Compounds |
| Diamond packing efficiency 34% | Correct | Standard calculation, a = 8r/√3 |
| HCP and CCP packing efficiency 74%, CN 12 | Correct | Standard close-packing result |
Corrections made on the site
- Ilmenite: Fe2+, not Fe3+.
- Perovskite A-site list: Cr removed from the AII list.
- Tetrahedral radius-ratio working: the crossed-out algebra in the notes was not reproduced; the standard limiting value 0.225 is given.
- Tolerance-factor limits: the standard 0.71–1.0 ranges are given, with the notes’ 0.8 / 1.05 rule marked as an approximation.
- BCC paragraph: the in-plane neighbour count of four is not the bcc coordination number, which is 8.
Design
Built with the Hallmark design skill (nutlope/hallmark, installed with npx skills add nutlope/hallmark -g), theme Almanac: cool slate stock, pale printed sheet, blue-black ink, Hanken Grotesk heads over Newsreader prose, mono figures, one magenta accent. All figures are inline SVG drawn for this site — no photographs of the handwritten pages are reproduced, so the text is searchable.