GRAZING ANGLE INCIDENCE X-RAY DIFFRACTOMETER
1. High quality X-ray generator:
Microprocessor controlled x-ray generator with following specification
Maximum continuous output power 3.0KW
High voltage up to maximum 60 KV
Current up to maximum 60mA
Stability less than 0.01% per 10% mains variation or better
Proper radiation enclosure.
2. X-ray tube: i) With ceramic insulation
ii) Long line & point focus, without disconnection or realignment
iii) Cu anode.
Details of the X-ray tube i.e. make, rating, number of windows; life and warranty should be clearly mentioned.
iv) Operating condition: At 60KV, 55mA, power around 2.2 k.W or better.
3. Goniometer: a) Automated vertical type with independent Theta2-Theta geometry
b) Theta-2Theta drive with 2 Theta range from -40 deg. to 220 deg. or better.
c) The minimum grazing angle is 0.5 degree or better
d) Digitally controlled direct optical encoded position sensing system or better technology) with variable goniometer radius, continuous, step, fast scan modes of operation.
e) Angular reproducibility : 0.0001 deg. or better
f)Minimum step size: 0.001 deg. or better.
g) Scan Speed: 0.001-1.2 deg. Per sec or better
h) Maximum translation anywhere between 10 to 30 degree.
4. X-ray optics:
Optics should have both conventional Bragg-Brentano and parallel beam geometry
Parallel plate optics for grazing angle incidence. Optics with primary beta filters, programmable automatic divergence slits, programmable automatic receiving slits and programmable automatic antiscatter slits. The slits should be able to operate either in fixed or automatic mode. The slit widths (illuminated area) should be independently & continuously variable. It should have the provision for symmetric as well as asymmetric illumination. The grazing incidence to powder diffraction and other application should change without the need for alignment. X-ray diffractometer should based on pre-aligned optics concept where different optical geometries including primary, secondary and sample stages should be easily exchangeable by the user without any need for alignment to go one application to the other within a short time.
5. Detector:
The Detector should have high speed and high sensitivity based on Real Time Multiple Strips technology/ or equivalent technology and capable to scan a sample 80-100 times faster than the normal Scintillation or Sealed Proportional detector. The high-speed detector should function without the need of gas or liquid nitrogen or water.
6. Calibration Standard:
A standard sample for calibration of the instrument.
7. Controls:
Complete computer (PC) based control of all operations including all the slits and focusing. The slits should also have the option of fixed width operation. Should have the facility of symmetric and asymmetric operation. Electronics with integrated shutter control in order to monitor all diffractometer functions such as, angles, counts, slits, generator & safety etc.
8. Protection:
The system should be housed in a high safety standard radiation enclosure.
9. Computer:
Latest computer system with Pentium IV processor, speed 1.6G Hz or better, 40GbHDD better, 1.44FDD, 128Mb SD RAM or better, CD writer, Large SVGAcolour monitor, 2 serial & 1 parallel port, operating software & printer or any other latest configuration.
10. Software
Software with simultaneous data collection & analysis, peak search, search match supporting ICDD PDF-1/PDF-2 database, profile fitting & elaborate pattern treatment such as data smoothing, background subtraction, quantitative analysis package, crystallography etc and any special software for analysis of grazing incidence and thin film application.
Standard less Quantitative software based on Rietveld method supported by ICSD database & users database. Should be operable from PC with Windows or NT environment.
11. Reference database:
i) ICDD PDF-2 (with PDF-1) database-latest version on CD-ROM.
ii) ICSD database-latest version on CD-ROM.
12. Mains Supply:
220 volts AC, Single phase, Frequency :50 Hz.
13. Spares:
3 years' essential spares including all-important PCBs for generator and control electronics should be provided. The detailed list of spares to be enclosed.
14. Manual:
One set of operating manual and service manual (in English) should be provided with the equipment.
15. Training:
Training for one scientific staff for two weeks at the Principal's Supply Center and application Laboratory at supplier's cost. The scientific staff and students will also trained during installation at site free of cost.
16. Warranty:
12-36 months from the date of installation.
17. Users' List:
Number of installations of the quoted model in India with names and addresses of the Institutes/Laboratories should be provided.
18. General:
Printed supporting documents of the manufacturer of the equipment for the quoted items should be provided (as far as possible).
19. Optional:
i) GIXRD at high temperature (up to 10000 C) with gas flow provision attachment.
ii) The diffractometer should have the facility to mount various attachments for studies such as non-ambient, stress etc. with pre-aligned attachment in ease of future upgradation and ease of switching from one application to the other without the need for alignment.
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