FIG. 4.
The melting temperature of naphthalene was measured with the piezo-thermal probe. Figure 4(a) shows the change in resistance of the deflection sensing element on the vertical axis with temperature increase of the heating element on the horizontal axis. As expected the increase in temperature caused by incremental increase in power through the heating element also increases the resistance of the deflection sensing element. Figure 4(b) shows the first order derivative (dRpiezo/dT) of the deflection sensing element on the vertical axis with temperature increase of the heating element on the horizontal axis. Near the reported melting temperature a local decrease in resistance is observed in both Figs. 4(a) and 4(b) at 78.5 °C indicating a glass transition.