How can I successfully grow high-quality KDP crystals?

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Discussion Overview

The discussion revolves around the challenges of growing high-quality KDP (potassium dihydrogen phosphate) crystals, focusing on the methods, conditions, and factors influencing crystal formation. Participants share their experiences, observations, and seek advice on improving their crystal growth techniques.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant reports difficulties in growing KDP crystals, noting that an initial crystal formed but later dissolved, raising questions about the conditions affecting crystal formation.
  • Another participant suggests checking the solubility of potassium phosphate at the experimental temperature to ensure a saturated solution, which is crucial for crystal growth.
  • Concerns are raised about the purity of the fertilizer used, with a participant noting that it may not be entirely KDP, potentially complicating the growth process.
  • There is speculation about the influence of external factors, such as sound or vibration, on crystal formation, as well as observations of uneven growth patterns in the initial crystal.
  • One participant describes the process of seeding and growing crystals as complex, emphasizing the need for stable conditions and patience to achieve high-quality results.

Areas of Agreement / Disagreement

Participants express varying opinions on the factors influencing crystal growth, with no consensus on the best methods or the reasons behind the initial crystal formation. Multiple competing views on the role of purity and environmental conditions remain present.

Contextual Notes

Limitations include potential missing assumptions regarding the purity of materials used, the specific conditions required for optimal crystal growth, and the influence of external factors that have not been thoroughly explored.

Strange_matter
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TL;DR
I'm trying to grow a KDP crystal, but am having issues.
I've been trying to grow a KDP (potassium dihydrogen phosphate) crystal, but I'm having trouble growing anything. I've been adding potassium phosphate fertilizer to distilled water in a bottle I cleaned out and heating it to dissolve the chemicals, but so far haven't gotten much results. It's possible I'm not using enough chemicals. Oddly, one crystal did form at the bottom of the glass and nowhere else a few days ago, but when I moved the solution and dissolved more potassium phosphate the crystal dissolved again; possibly due to the solution still being hotter than I realized when I added the crystal. Can anyone explain the formation of the initial crystal? Could it be influenced by sound or vibration? Also tips on how to grow a crystal with decent quality would be appreciated.
 
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First of all - check what the solubility at the experiment temperature is to make sure you have a saturated solution.
 
Borek said:
First of all - check what the solubility at the experiment temperature is to make sure you have a saturated solution.
I may not be using enough fertilizer, so I can try adding more. I am still interested in how that initial crystal formed though. Do you have any idea? There was also something floating in the solution after the crystal formed, which may have been a small fragment of the ribbon I was using as a substrate to grow the crystal on. The crystal also seemed like it may have been growing in uneven, long pentagonal layers.
 
Seeding and growing crystals is a bit of black magic. In general they most likely form on some already existing solids (can be just a random dust particle). Growing nice ones is not easy either, sometimes (depends on the substance) requires a lot of patience (growing them fast rarely produces nice ones) and controlling of the conditions (especially the temperature must be held as stable as possible).

Fertilizer is definitely not pure, it is probably just "mostly" KDP, which may make your attempts a bit more difficult.
 

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