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Nucleation of struvite (MgNH4PO4 · 6 H2O) single crystals and aggregates

✍ Scribed by R. Boistelle; Prof F. Abbona

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
459 KB
Volume
20
Category
Article
ISSN
0232-1300

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✦ Synopsis

Nucleation of Struvite (MgNH,PO, . 6 H,O) Single Crystals and Aggregates

T h e conditions (concentration and pH) for preparation of single crystals of struvite at 25 "C from animoniacal solutions equimolar with respect t o magnesium and phosphate ions are given. T h e limits a r e found above which crystal aggregates (twins or dendrites) Ilrecipitate as dominant morphology. The mechanisms of nucleation a r e tliscnssed and t h e interfacial tension between crystals and solution is evaluated.

Fiir die Priiparation bei 25 O C von Struvit-Einkristallen a m iiquimolaren Ammoniak-Loslingen in hezug auf die Magnesium-und Phosphat-Ionen, werden die Bedingungen trngcgeben (Konzentration, p H -W e r t ) . Es werden die Grenzen bestimmt, bei denen sich Kristall-Aggregate ausscheiden (Zwillinge oder Dendrite). Der Mechanismus der Keimbiltlung wird tfiskutiert, wohei die Grenzfliichenspannung zwischen den Kristallen und tler Losiing bestimmt wird.

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