Orientation of the -rotated-cut plates.
X-ray topography of a -rotated plate of . (The two white bars at the extremities of the sample are due to the supports.)
Graphical resolution of with for the four well-known -quartz-type materials.
Wave velocity of the shear mode vibration (associated with the elastic constant) of the AT cut in the -quartz materials.
TGA measurements on powder.
Experimental (+) and calculated (solid line) powder-diffraction profiles from the Rietveld refinements of the structure of . The lower curve is the difference curve between experimental and calculated profiles.
Temperature dependence of the intertetrahedral (–O–) bridging angle in -quartz materials (see Refs. 29, 31, 35, and 36).
Evolution of the normalized interplanar distance of the AT plane as a function of the temperature for the well-characterized -quartz materials (see Refs. 29, 31, and 36).
Air-gap piezoelectric results.
AT-cut characteristic parameters of the well-characterized -quartz materials compared to the corresponding experimental values obtained for .
Unit-cell parameters, volume, and agreement factors for as a function of temperature.
Fractional atomic coordinates and isotropic atomic displacement parameters of as a function of temperature. Trigonal: , Ga: sites (,0,), As: sites (,0,), O: sites .
Intertetrahedral Ga–O–As bridging and tetrahedral tilt angles (°) in as a function of temperature.
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