**Variable Composition**: Lacks fixed proportions of components.

**Deficient or Excess Reactants**: Imbalance in reactant quantities used.

**Non-integer Ratios**: Involves ratios not expressible as whole numbers.

**Solid Solutions**: Mixtures with varying atomic/molecular arrangements.

**Phase Variation Effects**: Changes due to different phases present.

**Complex Formation Variability**: Diverse structures formed from reactions without strict ratios.

**Kinetic Considerations Influence Stoichiometry**: Reaction rates affecting expected product amounts.

**Nonstoichiometric Compound**: Substance with variable composition ratios.

**Nonstoichiometric Reaction**: Chemical reaction lacking fixed reactant/product ratio.

**Nonstoichiometry**: Study of substances without defined stoichiometric proportions.

**Defect Structure**: Arrangement in solids deviating from ideal ratios.

**Solid Solution Phase**: Mixture exhibiting varying component concentrations uniformly distributed.