NH <sub>4</sub> B <sub>3</sub> PO <sub>6</sub> (OH) <sub>3</sub> : A Hydroxyborophosphate with Short DUV Cutoff Edge and Large Birefringence

Birefringent crystals, as core materials for polarization modulation, hold significant importance for the advancement of laser polarizing technology, high-precision instruments, and other optical communication fields today. However, balancing the deep ultraviolet (DUV) cutoff edge and birefringence remains a demanding challenge. Borophosphates have emerged as a promising research direction for optoelectronic functional materials, but the small birefringence of most borophosphates limits their applications. Here, a novel mixed-coordinated hydroxyborophosphate, NH<sub>4</sub>B<sub>3</sub>PO<sub>6</sub>(OH)<sub>3</sub>, has been successfully designed and obtained. This compound belongs to the triclinic space group <i>P</i>1 (No. 2), exhibiting pronounced birefringence (the experimental refractive index difference value is 0.057 at 546 nm) and a short DUV cutoff edge below 200 nm. These properties indicate that NH<sub>4</sub>B<sub>3</sub>PO<sub>6</sub>(OH)<sub>3</sub> exhibits excellent potential as a DUV birefringent material.

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Publication Details

Journal
Inorganic Chemistry
Published
2026-03-27
DOI
https://doi.org/10.1021/acs.inorgchem.6c00827
Primary Topic
Crystal Structures and Properties
Type
article
Field-Weighted Citation Impact
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article

NH 4 B 3 PO 6 (OH) 3 : A Hydroxyborophosphate with Short DUV Cutoff Edge and Large Birefringence

Xueling Hou, Shuai An, Hangwei Jia, Yansheng Jiang et al.
Inorganic Chemistry
Crystal Structures and Properties
article

NH 4 B 3 PO 6 (OH) 3 : A Hydroxyborophosphate with Short DUV Cutoff Edge and Large Birefringence

Xueling Hou, Shuai An, Hangwei Jia, Yansheng Jiang, Bailin Chen, Shilie Pan
article en

Abstract

Birefringent crystals, as core materials for polarization modulation, hold significant importance for the advancement of laser polarizing technology, high-precision instruments, and other optical communication fields today. However, balancing the deep ultraviolet (DUV) cutoff edge and birefringence remains a demanding challenge. Borophosphates have emerged as a promising research direction for optoelectronic functional materials, but the small birefringence of most borophosphates limits their applications. Here, a novel mixed-coordinated hydroxyborophosphate, NH<sub>4</sub>B<sub>3</sub>PO<sub>6</sub>(OH)<sub>3</sub>, has been successfully designed and obtained. This compound belongs to the triclinic space group <i>P</i>1 (No. 2), exhibiting pronounced birefringence (the experimental refractive index difference value is 0.057 at 546 nm) and a short DUV cutoff edge below 200 nm. These properties indicate that NH<sub>4</sub>B<sub>3</sub>PO<sub>6</sub>(OH)<sub>3</sub> exhibits excellent potential as a DUV birefringent material.

Inorganic Chemistry
Xinjiang Technical Institute of Physics & Chemistry (CN), University of Chinese Academy of Sciences (CN)
Openalex Percentile: Top 8%
Crystal Structures and Properties
DOISourceOpenAlex
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NH <sub>4</sub> B <sub>3</sub> PO <sub>6</sub> (OH) <sub>3</sub> : A Hydroxyborophosphate with Short DUV Cutoff Edge and Large Birefringence — Xueling Hou, Shuai An, et al. · Inorganic Chemistry (2026) | TGRS Research Map | TGRS