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Related Concept Videos

Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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An Experimental Protocol for Studying Mineral Effects on Organic Hydrothermal Transformations
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GaPO4 Single Crystals: Growth Condition by Hydrothermal Refluxing Method.

Denis Balitsky1, Etienne Philippot2, Vladimir Balitsky3

  • 1Cristal Laser SAS, 54850 Messein, France.

Molecules (Basel, Switzerland)
|October 7, 2020
PubMed
Summary

A new hydrothermal refluxing method enables the growth of Gallium Phosphate (GaPO4) single crystals up to 20g. This technique ensures constant mass transport, ideal for materials with retrograde solubility, and is highly reproducible.

Keywords:
crystal growthgallium orthophosphatehydrothermal methodpiezoelectric crystals

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid State Chemistry

Background:

  • Gallium Phosphate (GaPO4) is a high-temperature piezoelectric material, crucial for applications operating near its α-β phase transition at 970 °C.
  • Traditional crystal growth methods face challenges with materials exhibiting retrograde solubility, hindering efficient nutrient transport and crystal formation.

Purpose of the Study:

  • To develop and present a novel hydrothermal refluxing method for the growth of Gallium Phosphate (GaPO4) single crystals.
  • To demonstrate the method's effectiveness for materials with retrograde solubility, ensuring consistent mass transport and high-quality crystal yield.

Main Methods:

  • Utilized a hydrothermal refluxing technique with spatially separated dissolution and growth zones.
  • Grew GaPO4 crystals (10-20g) in aqueous solutions of phosphoric acid (H3PO4) and hydrochloric acid (HCl) at 180-240 °C and 10-20 bars.
  • Employed a dropping flow of condensed solvent for nutrient transport, enabling precise control over saturation and preventing spontaneous crystallization.

Main Results:

  • Successfully grew GaPO4 single crystals weighing 10-20g with moderate hydroxyl (OH-) content and good structural uniformity.
  • The refluxing method achieved constant mass transport, overcoming challenges associated with retrograde solubility.
  • Demonstrated precise control over GaPO4 concentration in various acidic solutions (H3PO4, H2SO4, HCl) under specific temperature-pressure conditions (T < 250 °C, p = 10-30 bars).

Conclusions:

  • The hydrothermal refluxing method is a simple, highly reproducible technique for GaPO4 single crystal growth.
  • This method is effective for materials with retrograde solubility and shows potential for application to other similar compounds.
  • The developed technique offers a reliable approach for producing high-quality GaPO4 crystals for advanced material applications.