Quartz Multi High Lumbered Bars

Multi-High Lumbered Bars

This document provides typical specifications for single crystal cultured quartz multi-high humbered bar quartz, grown on Z-plate seeds and lumbered into several uniformly dimensioned bars. The individual as-grown crystals are crystallographically oriented and lumbered with several cuts in the YZ plane; thus producing equal sized lumbered bars, as shown below. In this process, the "top", "centre" and "bottom" bars differ slightly in that while the centre bars are pure-Z material, both the top (+X direction) and bottom (-X direction) bars contain a small quantity of +X or -X material, respectively. This non-Z material is, in all cases, limited to a thickness not to exceed 2.0 mm. Seed material in tops, centres and bottoms is centred in the Z direction within a 3.0 mm wide band.

Section Drawing

Mechanical Characteristics

		Units	Typical Values	Tolerance
	X-height x Z-width	mm	10.0 x 20.0	± 0.13
		mm	9.5 x 19.0	± 0.13
		mm	9.0 x 18.0	± 0.13
	Y-Iength	mm	200	± 5
Orientation of X-surface	@ Y-axis	degrees	0	± 15 minutes
	@ Z-axis	degrees	0	± 15 minutes
Orientation of Z-surface	@ X-axis	degrees	0	± 1 degree
	@ Y-axis	degrees	0	± 1 degree
Flatness of -X lumbered surface		mm	Flat	± 0.1
Flat Surface finish of -X lumbered surface, Ra		µm	4.0	maximum

Material Characteristics

Handedness		Right
Infrared α (3500 cm-1)		α -units	Grade B: 0.045		Maximum
			Grade C: 0.060
			Grade II	Grade I
Inclusions (diameter)	25-75 µm	cm3	5	4	Maximum
	75-100 µm	cm3	4	2	Maximum
	>100 µm	cm3	3	2	Maximum
Etch channels		cm2	Grade 4: 300		Maximum
Twins and cracks in useful volume		Count	None

Seed Characteristics

Seed centricity	Within central 3 mm
Non-Z material	+X growth	2.0 mm maximum
	-X growth	2.0 mm maximum

Marking and Packaging

Supplier logo, grind lot number, part number and "MinusX" are marked in ink on the minus-X surface of each bar.
Bars are packed in individual cells within double walled cardboard boxes containing approximately 25 kg.
Total piece count net weight, gross weight and part number are marked on the exterior of the carton.
Cartons are appropriately marked for export purposes and affixed to wooden pallets suitable for ocean transport.

References

International Electrotechnical Commission Standard, CEI/IEC 758, Second edition, 1993-04.

Institute of Electrical and Electronic Engineers Standard on Piezoelectricity, ANSI / IEEE Std. I 76~l 987.