Typical search problems
- Non-stoichiometric compounds or alloys which may be represented in several ways, e.g., GaAIAs or GaxAl1-xAs
- Chemical formulae that have the same spellings as common English words, e.g., GaP
- Some chemicals have the same letters and are differentiated by the use of upper and lower case, e.g., Co (cobalt) or CO (carbon monoxide).
Each chemical index term has a role indicator assigned to it to distinguish between the different references.
- el for element - e.g., Si
- bin for binary (two components) - e.g., GaAs
- ss for system (three or more components) - e.g., H2SO4.
Some substances may be assigned one or more special roles which are of significance to solid-state physics and electronics. These are:
- int – interface system
- sur – surface or substrate
- ads – adsorbate
- dop – dopant.
Each component of a substance is assigned one of these roles - e.g., the element silicon (Si) is indexed as Si/el and silicon dioxide is indexed as Si02/bin Si/bin 0/bin.
Examples of chemical indexing
- H2SO4 H2SO4/ss SO4/ss H2/ss O4/ss H/ss S/ss O/ss
- P doped Si Si:P/bin Si/bin P/bin Si/el P/el P/dop
- Cu-Al alloy CuAl/bin Cu/bin Al/bin
- Si-Au interface Si-Au/int Si/int Au/int Si/el Au/el
- GaAlAs GaAlAs/ss Ga/ss Al/ss As/ss
- GaxAl1-xAs GaAlAs/ss Ga/ss Al/ss As/ss
- Ga0.25Al0.75As Ga0.25Al0.75As/ss Ga0.25/ss Al0.75/ss Ga/ss Al/ss As/ss.
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