True modulus of the PZT film composite vs. maximum indentation depth curves at different temperature (a), and hardness vs. contact depth curves of the PZT film composite at different temperature.

<p>The black dots represent the experimental results (b). The red lines in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116478#pone.0116478.g007" target="_blank">Fig. 7A</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116478#pone.0116478.g007" target="_blank">Fig. 7B</a> represent the fitting results by <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116478#pone.0116478.e012" target="_blank">equation 6</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0116478#pone.0116478.e015" target="_blank">equation 9</a>, respectively.