TABLE OF CONTENTS S. Adachi
April 1998
The crystal density d is one of the most important material parameters. It can be given by
| (1) |  |
where a, M, N A and d M are the lattice parameter, molecular weight of the crystal, Avogadro's constant (6.0221367 10 23 mol -1) and molecular density, respectively. The molecular weight M of InP is 145.7938 g.
If an accurate lattice parameter is available, the calculation of d then gives a good reliable value. Data on the lattice parameter of InP suggest that a = 586.90 pm [1] so that at 300 K
TABLE 1 lists the values of d for temperatures between 4.2 and 600 K, as calculated from EQN (1) with a from [1]. The X-ray d data for T ? 700 K from Brice [2] are also listed in this table.
| T(K) | d(g/cm 3) |
|---|---|
| 4.2 | 4.7982 |
| 12 | 4.7982 |
| 20 | 4.7982 |
| 29 | 4.7983 |
| 39 | 4.7984 |
| 49 | 4.7984 |
| 59 | 4.7985 |
| 70 | 4.7985 |
| 80 | 4.7985 |
| 90 | 4.7985 |
| 100 | 4.7984 |
| 109 | 4.7984 |
| 119 | 4.7982 |
| 127 | 4.7979 |
| 136 | 4.7977 |
| 156 | 4.7971 |
| 175 | 4.7963 |
| 195 | 4.7954 |
| 214 | 4.7945 |
| 232 | 4.7936 |
| 251 | 4.7926 |
| 272 | 4.7914 |
| 286 | 4.7909 |
| 291 | 4.7904 |
| 300 | 4.7902 |
| 400 | 4.7836 |
| 500 | 4.7770 |
| 600 | 4.7704 |
| 700 | 4.763 |
| 800 | 4.756 |
| 900 | 4.749 |
| 1000 | 4.742 |
| 1100 | 4.733 |
| 1200 | 4.723 |
| 1300 | 4.712 |
TABLE 2 lists the measured values of d taken from [3, 4]. We obtain,...
