Calculation of Bond Lengths in InGaAsP Quaternary Alloy Semiconductor

Abstract
The bond lengths in an lnGaAsP quaternary alloy semiconductor were defermined using valence-force-field and continuum models. The bond lengths tend to preserve those in binary compounds. The length deviation from that of a binary compound is small if the bond-stretching force constant is large and/or the average bond-bending force constant is small. Theoretical results agree well with those obtained by experiments involving extended-X-ray-absorption fine-structure measurements. The validity of the Vegard law for a lattice constant is discussed and a slight discrepancy from the law is interpreted.