Anisotropic thermal expansion of α-Pb(N3)2

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Abstract
The anisotropic expansion coefficients of orthorhombic αPb(N3)2 in the temperature range 102–423 K were determined by a single crystal x‐ray method. The cell parameters and rms deviations at 298.2 K are a = 11.33344[17], b = 16.28277[37], and c = 6.64058[10] Å. The linear expansion coefficients change gradually from αa = 5.7 × 10−5, αb = 0.3 × 10−5, and αc = 1.4 × 10−5 K−1 at 112, to αa = 8 × 10−5, αb = 0.4 × 10−5, and αc = 2.0 × 10−5 K−1 at 412 K. The largest expansion is in the a direction, which is perpendicular to sheets of azide ions separated by lead atoms.

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