Hydrothermal synthesis of one-dimensional yttrium hydroxide particles by a two-step alkali-addition method

Abstract

One-dimensional yttrium hydroxide particles of hexagonal crystal structure were selectively synthesized through a hydrothermal reaction of yttrium chloride solution that was alkalized by two-step addition of sodium hydroxide solution. Keeping the YCl 3 solution at pH y 6.8 for a few minutes before raising the pH to the sufficient level (pH y 13) was concluded to be the practical requirement for the one-dimensional Y(OH) 3 particle formation. This requirement was successfully achieved by the two-step addition procedure that was applicable to adjust the pH values independently. The size distribution of one-dimensional particles was changed depending on the interval time between alkali-additions and on the pH of the hydrothermal reaction. The formation mechanism of the one-dimensional particles was also discussed.

Green fabrication of lanthanide-doped hydroxide-based phosphors: Y(OH)3:Eu3+ nanoparticles for white light generation

“…In this context, several methods have been used widely such as, sol-gel, hydrothermal, combustion, emulsion, precipitation, etc. [31][32][33][34] Among those, sol-gel and coprecipitation method are, in general, slow, and usually involve additional steps. On the other hand, there is a huge waste of organic solvents during the emulsion process, which makes this method inefficient in terms of cost and toxicity.…”

In Situ Topotactic Synthesis of Monodispersed Hierarchically Nanostructured Yttrium‐Based Microspindles from a Mesocrystal Precursor

“…Rare‐earth compounds, especially yttrium‐based materials, have been extensively studied because of their various applications in many fields such as lighting, displays, photovoltaics, and biomedicines . The controlled synthesis of yttrium‐based materials such as yttrium hydroxide, yttrium fluoride, and yttrium oxyfluoride, is always of great interest for researchers. Although yttrium‐based materials with various morphologies have been successfully synthesized by general synthetic methods, it still remains a challenge to fabricate monodispersed yttrium‐based materials through topotactic transformation , .…”

Analysis of products formed in hydrothermal processing of yttrium chloride in the presence of complexing agent (citric acid)

“…Наиболее часто для синтеза подобных соединений иттрия используют нитраты и хлориды иттрия [1][2][3][4][5][6]. При этом синтез проводят как в условиях близких к атмосферным [1][2][3], так и в условиях гидротермального синтеза под вакуумом при повышенной температуре [4][5][6]. Следует отметить, что именно соединения, полученные из хлорида иттрия, проявляют тенденцию к формированию чёткой структуры субмикронных размеров [4].…”

“…При этом синтез проводят как в условиях близких к атмосферным [1][2][3], так и в условиях гидротермального синтеза под вакуумом при повышенной температуре [4][5][6]. Следует отметить, что именно соединения, полученные из хлорида иттрия, проявляют тенденцию к формированию чёткой структуры субмикронных размеров [4]. Можно предположить, что наличие комплексона в растворе может способствовать устойчивости формирующихся фрагментов.…”