大型放射光施設 SPring-8

問い合わせ番号

INS-0000000319

　A transmission-geometry powder diffractometer having imaging plate as a detector, 'large Debye-Scherrer camera'^{[1, 2]} is installed at the BL02B2 experimental hutch (Table 1 & Fig. 1). This station is equipped with an off-line IP reader. It is also possible to record several powder patterns (max. 15) on a single IP using a long vertical slit (10 mm) attached before the IP (Fig. 2).

The sample temperature can be controlled in a wide range of temperature (30 ∼ 1100 K). The high and low temperature nitrogen gas flow systems are installed for high-temperature (300 ∼ 1073 K) and low-temperature (90 ∼ 300 K) experiments (Fig.3). It is possible to carry out the automated data collection in dependence of temperature controlled by LabVIEW^TM software. Under 90 K, temperature must be controlled by a helium gas flow temperature device.

　By taking advantage of third-generation high-energy synchrotron radiation, the camera enables one a rapid and easy collection of high counting statistics and high angular resolution powder data even for heavy materials (Fig. 4^[3]). As a result, the beamline has flexibility for many levels of structural studies, for example, from measuring just lattice constants to obtaining accurate electron densities under extreme conditions.

Table 1. Specifications of diffractometer.

Large Debye-Scherrer camera
IP detector	Size：　400(V)× 200 (H) mm Pixel size: 25μm - 100μm
	Camera radius：	286.48mm
	2θcoverrage	1 - 75°, 0.005-0.02°/step
Collimator size	0.1 (V) × 0.1 (H) mm2 ∼ 0.7 (V) × 3.0 (H) mm2

Fig1. Transmission-geometry powder diffractometer installed at the experimental hutch.

Fig2. Multi-pattern recording system on a single IP.

Fig 3. Temperature changing accessories.

Fig. 4. Rietveld fitting for PbTiO₃ at (a) 800 K (cubic phase) and (b) 300 K (tetragonal phase)^[3].

Reference

1. Nuclear Instruments and Methods in Physics Research A, 467-468 (2001) 1045.
2. Advance in X-ray Analysis, 45 (2002) 377.
3. Physical Review Letters, 87 (2001) 217601.