Investigations on Optical Scatter Particles during CdSiP2 Crystals Growth

doi:10.15541/jim20130601

Abstract

Abstract:

Polycrystalline charges of CdSiP₂ (CSP) were synthesized by direct reaction method using P, Si, and Cd elements as the initial materials. Single crystals with the dimension of 8 mm in diameter and 40 mm in length were successfully grown by vertical Bridgman method. The dimension and the composition of the optical scatter particles in the CSP crystals were identified by SEM measurement. The results show that most of optical scattering particles are round-shaped with dimension of 2-8 μm. The EDS measurement result shows that the atomic percent of Si in the optical scattering particles is over 88%. The synthesis mechanism of CSP by single temperature zone method was studied by powder XRD. The results show that there is some unreacted silicon left when synthsized process is carried out below 1150℃. By optimizing the synthesis parameters and the Si inclusions were successfully restrained and the high optical quality CSP single crystal was obtained.

Key words: CdSiP2, nonlinear optical crystal, crystal defect, vertical Bridgman growth

CLC Number:

O782

ZHANG Guo-Dong, LI Chun-Long, WANG Shan-Peng, ZHANG Xiang, ZHANG Xi-Xia, TAO Xu-Tang. Investigations on Optical Scatter Particles during CdSiP₂ Crystals Growth[J]. Journal of Inorganic Materials, 2014, 29(8): 855-858.

Figures/Tables 6

Fig. 1 Photograph of polished CSP single crystal

Fig. 2 SEM image of the inclusions in CSP crystal

Table 1 Compositions of inclusions and CSP “clear area” measured by EDS

Element	Scatter particles		CSP
Element	wt%	at%	wt%	at%
Si	79.28	88.23	13.02	23.30
P	8.23	8.30	32.17	52.19
Cd	12.49	3.47	54.81	24.51
Total	100.00	100.00	100.00	100.00

Fig. 3 Powder XRD patterns of the products reacted at different temperatures (a) 500℃; (b) 600℃; (c) 700℃; (d1) 780℃ (products at the top of the ample); (d2) 780℃ (products at the bottom of the ample); (e) 1050℃; (f) 1150℃

Fig. 4 Transmission spectra of CSP crystal with inclusions and (a) inclusions-free CSP crystal (b)

Fig. 5 High quality CSP single crystal without optical scattering particles

References 17

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Investigations on Optical Scatter Particles during CdSiP₂ Crystals Growth

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