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Structural, optical and dielectric studies on K1-x(NH4)xH2PO4 mixed crystals grown from z-cut seeds

✍ Scribed by Zhong De-Gao; Teng Bing; Yu Zheng-He; Ge Xiao-Hui; You Fei; Xu Hui; Zhang Shi-Ming; Yu Yue-Juan; Ma Jiangtao

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
235 KB
Volume
45
Category
Article
ISSN
0232-1300

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✦ Synopsis

Mixed crystals of K 1-x (NH 4 ) x H 2 PO 4 (KADP) were grown from KDP (KH 2 PO 4 ) dominated mixed solutions with varying molar proportion of ADP (NH 4 H 2 PO 4 ) addition. It was found that, as the increase of ADP molar concentration, the growth rate along z-axis of KADP crystal decreased rapidly. The structure of KADP crystals was investigated by powder XRD and the lattice parameter was calculated. The results showed that the lattice parameter c of KADP crystal increased with the molar concentration of ADP. The optical homogeneity of grown KADP crystals was determined with a differential phase-shifting interferometry. Frequency dependences of the dielectric constant and dielectric loss of KADP crystals were measured at room temperature (290 K). The dielectric constants of KADP crystals were almost invariant with the increase of frequency. In the region of 10 2 -10 4 Hz, the values of the dielectric loss reduced with the increase of frequency. The piezo-resonance coupling effect still exists in KADP crystals at room temperature, but shifted to low frequency band.

πŸ“œ SIMILAR VOLUMES

Growth and characterization of K1-x(NH4)
Growth and characterization of K1-x(NH4)xH2PO4 mixed crystals onto z-cut point seeds
✍ Zhong De-Gao; Teng Bing; Wang Shu-Hua; Jiang Xue-Jun; Li Ming; He Lin-Xiang; Hua πŸ“‚ Article πŸ“… 2009 πŸ› John Wiley and Sons 🌐 English βš– 186 KB

## Abstract Mixed crystals of potassium dihydrogen phosphate and ammonium dihydrogen phosphate were grown onto point seeds by the method of temperature reduction. It was found that the regeneration process of z‐cut point seeds became more and more difficult with increasing KH~2~PO~4~ concentration

Growth and thermal studies on pure ADP,
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The investigations on the formation of mixed crystals of ammonium dihydrogen orthophosphate (ADP) and potassium dihydrogen orthophosphate (KDP) i.e. potassium ammonium dihydrogen phosphate, K 1-x (NH 4 ) x H 2 PO 4 have been presented in this paper. Pure and mixed crystals of ADP and KDP have been g