ABSTRACT
Figure 19 Logarithm of conductivity versus inverse of temperature plot for B0.35Q .30N0.35 synthesized by reaction (4). Dc four-probe measurements were made on two separate samples deposited on boron nitride chips. (From Ref. 5.)
Figure 20 Logarithm of conductivity versus inverse of temperature plot for BC3N plate synthesized by reaction (9). (From Refs. 14 and 15.)
Figure 21 Logarithm of conductivity versus inverse of temperature plot for BC4N synthesized by reaction (14). (From Ref. 24.)
nescence spectrum of BN(C,H) prepared at 1000°C on the Ni substrate by re action (10). Light around 300 nm from a mercury lamp was most effective for exiting this material. The luminescence was observed in a wide range (300 to 500 nm) with a peak at 343 nm. A white-blue color could be seen by the naked eye. Figure 23 shows the photoluminescence spectrum of BN(C,H) prepared at 1800°C on a graphite substrate by the CVD method. Exitation light of 310 nm was employed in this case. The peak position was shifted to a longer wavelength than that of BN(C,H) prepared at 1000°C. The peak positions of the exitation and emission bands generally showed a shift to longer wavelength with increase in the preparation temperature, even for material of the same carbon content in BN(C,H). The peak shift is perhaps a consequence of changes in the electronic energy levels as the particles grow in size with increasing temperature.
