Portable X-ray diffractometer "Boule"

PORTABLE X-RAY DIFFRACTOMETER FOR SHEAR- CUT ORIENTATION ANALYSIS IN SINGLE- CRYSTAL BOULE

(based on capillary optics)

miniature
easy alignment and sample change
radiation safety
high accuracy of deviation angle determination
express method
permits in-line application

Intended use of x-ray diffractometer "Boule": designed for quick determination of orientation of the first cut in large grown single crystals of Si, corundum, quartz, based on deviation of diffraction maximums, wherein the convergent primary x-ray beam had an axis perpendicular to the surface of single-crystal boule cut

Principle of operation the x-ray diffractometer "Boule": Kumakhov polycapillary lens (capillary optics, X-ray optics) used to form a convergent beam with convergence angles of ~ 5° permits to receive diffraction reflexes immediately from several crystallographic planes, forget use of complicated goniometer devices to rotate the sample, considerably reduce their exposure time (down to several seconds).

Software of x-ray diffractometer

Software permits simultaneous processing of input from two detectors to determine orientation of the diffraction cone.

Goniometer Device of the x-ray diffractometer "Boule" On the goniometer device, an x-ray tube equipped with a polycapillary lens forming a convergent x-ray beam is mounted. To register the picture of diffraction, two linear-coordinate detectors are placed at equal angular distances from the x-ray tube. The goniometer is put on top of a support, which axis is parallel to the axis of boule. When specified crystallographic plane coincides with the cut surface plane, detectors register two symmetric peaks; when they do not coincide – the two peaks will be asymmetric.

Electronic Control Unit Electronic control unit of x-ray diffractometer "Boule" includes high-voltage power supplies to x-ray tube and linear-coordinate detector, ADC, input matching board, and power supply control unit.

Basic Characteristics of X-ray Diffractometer "Boule"

Error of measurement of angular positions of single crystal diffraction maximums, degrees	Not more than 0.015
Mean square deviation of measuring angular positions of single crystal diffraction maximums, degrees.	0.025
Range of 2q diffraction angles, degrees.	from 20 to 80
Power consumption, not more, VA	250
Line voltage, V Frequency, Hz	220±22 50 - 60
Weight, not more, kg	25
Dimensions, not more (length х width х height), mm - goniometer device - power supply & registration unit	300 х 450 х 450 500 х 260 х 400