Hello Jia Zhou, One of many places to find the thermal expansion coefficient of silicon dioxide is as follows: Milton Ohring "The Materials Science of Thin Films" Academic Press, San Diego California 1992 The value provided in this text is 0.55 ppm/K. Please keep in mind that this value will vary depending on how the oxide was produced. Best Wishes, Craig McGray Dartmouth College mems-talk-request@memsnet.org wrote: > Message: 9 > From: Jia Zhou> To: mems-talk@memsnet.org > Date: Mon, 11 Mar 2002 07:44:36 -0600 (CST) > Subject: [mems-talk] Thermal expansion coefficient of oxide film > Reply-To: mems-talk@memsnet.org > > Wher can I find the thermal expansion coefficient of silicon oxide film. Thanks.