Discussion Forum

Hi, everybody!
Recently,I study quartz oscillator,I reffered the example(thickness_shear_quartz_oscillator.mph),In this example,the document writed :
The crystal axes used to define material properties in COMSOL correspond to the 1987 IEEE standard.
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The 1987 standard defines the AT cut as: (YXl) −35.25°.
For AT cut quartz only one rotation, about the l axis, is required,This is illustrated in Figure 2:
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But ,then:

Figure 3: Defining an AT cut crystal plate within COMSOL, with normal in the global
Z-direction. Within the 1987 IEEE standard the AT cut is defined as (YXl) −35.25°.
Begin with the plate normal in the Zcr-direction, so the crystal and global systems are
coincident. Rotate the plate so that its thickness points in the Ycr-direction (the starting
point for the IEEE definition), the global system rotates with the plate (b). Rotate the plate
−35.25° about the l axis (d). Finally rotate the entire system so that the global coordinate
system is orientated as it appears in COMSOL (d). The local coordinate system should be
defined with the Euler angles (ZXZ: 0, -54.75°, 0). (e) shows a coordinate system for this
system in COMSOL.

So,I think the Euler angles should is (ZXZ: 0, -35.25°, 0). ?????????????
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The other question is ,if I wantto get P-wave,how the Euler angles to set??? (ZXZ: 0, 35.25°, 0). ??
is it right?