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Holmium (III) nitrate is an inorganic compound, a salt of holmium and nitric acid with the chemical formula Ho(NO₃)₃.^[1] The compound forms yellowish crystals, dissolves in water, also forms crystalline hydrates.^[2]

Synthesis

Anhydrous salt is obtained by the action of nitrogen dioxide on holmium(III) oxide:

{\mathsf {2Ho_{2}O_{3}+9N_{2}O_{4}\ {\xrightarrow {150^{o}C}}\ 4Ho(NO_{3})_{3}+6NO}}

Effect of nitrogen dioxide on metallic holmium:

{\mathsf {Ho+3N_{2}O_{4}\ {\xrightarrow {200^{o}C}}\ Ho(NO_{3})_{3}+3NO}}

Reaction of holmium hydroxide and nitric acid:

{\mathsf {Ho(OH)_{3}+3NHO_{3}\ \xrightarrow {150^{o}C} \ Ho(NO_{3})_{3}+3H_{2}O}}

Physical properties

Holmium(III) nitrate forms yellowish crystals.

Forms a crystalline hydrate of the composition Ho(NO₃)₃•5H₂O.^[3]

Soluble in water and ethanol.

Chemical properties

Hydrated holmitic nitrate thermally decomposes to form HoONO
₃ and decomposes to holmium oxide upon subsequent heating.

Application

The compound is used for the production of ceramics and glass.

Also used to produce metallic holmium and as a chemical reagent.

References

^ Лидин, Ростислав; Молочко, Вадим; Андреева, Лариса (2 February 2019). Константы неорганических веществ. Справочник (in Russian). Litres. p. 40. ISBN 978-5-04-077039-7. Retrieved 18 August 2021.
^ "14483-18-2 - Holmium(III) nitrate pentahydrate, REacton®, 99.9% (REO) - 14588 - Alfa Aesar". Alfa Aesar. Retrieved 18 August 2021.
^ "Holmium(III) nitrate pentahydrate". Sigma Aldrich. Retrieved 18 August 2021.

[1] Лидин, Ростислав; Молочко, Вадим; Андреева, Лариса (2 February 2019). Константы неорганических веществ. Справочник (in Russian). Litres. p. 40. ISBN 978-5-04-077039-7. Retrieved 18 August 2021.

[2] "14483-18-2 - Holmium(III) nitrate pentahydrate, REacton®, 99.9% (REO) - 14588 - Alfa Aesar". Alfa Aesar. Retrieved 18 August 2021.

[3] "Holmium(III) nitrate pentahydrate". Sigma Aldrich. Retrieved 18 August 2021.

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