As a critical component of polarization devices and optical devices,birefringent crystals are widely used in high-tech fields such as laser communication,laser polarization engineering,and high-precision scientific re...As a critical component of polarization devices and optical devices,birefringent crystals are widely used in high-tech fields such as laser communication,laser polarization engineering,and high-precision scientific research instruments.In this study,two new hydroxyl borates,KB_(7)O_(9)(OH)_(4)and KB_(7)O_(10)(OH)_(2),were synthesized successfully via the hydrothermal method.The two hepta-borates feature different fundamental building units:[B_(7)O_(10)(OH)_(4)]in KB_(7)O_(9)(OH)_(4)and[B_(7)O_(12)(OH)_(2)]in KB_(7)O_(10)(OH)_(2).These units polymerize through oxygen atoms to form a one-dimensional(1D)infinite[B_(7)O_(10)(OH)_(4)]chain and a two-dimensional(2D)[B_(7)O_(12)(OH)_(2)]layer,respectively,demonstrating a hydroxyl-induced structural reconstruction.Notably,the 1D[B_(7)O_(9)(OH)_(4)]_(∞)infinite chain in KB_(7)O_(9)(OH)_(4)represents the first such structure identified in inorganic hydrated hepta-borates,as confirmed by the ICSD database.Performance characterization reveals that both compounds exhibit deep-UV transparency(with cut-off wavelengths shorter than 200 nm)and moderate birefringence values ranging from 0.041 to 0.078 at 546 nm,highlighting their potential as deep-UV birefringent crystal candidates.展开更多
In the deep Earth, hydrogen mainly occurs as structural hydroxyl and molecular water in minerals and melts, constituting mobile and immobile aqueous components. Hydrous minerals contain hydrogen which occupies a speci...In the deep Earth, hydrogen mainly occurs as structural hydroxyl and molecular water in minerals and melts, constituting mobile and immobile aqueous components. Hydrous minerals contain hydrogen which occupies a specific structural position and constitutes an indispensable component of chemical formulae. On the other hand, nominally anhydrous minerals do not contain hydrogen in their chemical formulae, but can host trace amounts of water in structural position and lattice defect. The molecular water may occur in the lattice defect as fluid/melt inclusions in minerals. Even though the water content of nominally anhydrous minerals is very limited generally in the order of ppm(parts per million), they may play a significant role in influencing the physicochemical properties of mineral and rock systems. With the continuous improvement of modern instrumentations, the analytical methodology exhibits trends for higher spatial resolution, lower detection limit and integral multiple methods on the water amount and its isotopic ratio. Among these methods, Fourier transform infrared spectrometry remains the most widely used, while secondary ion mass spectrometry, continuous flow mass spectrometry, elastic recoil detection analysis and Raman spectrometry are promising. This paper provides a brief review on the methodological progress and their applications to the analysis of structural water in nominally anhydrous minerals.展开更多
基金supported by the National Natural Science Foundation of China(22361132544,22193044,and 22335007)the Tianshan Basic Research Talents Program(2022TSYCJU0001)+2 种基金the CAS Project for Young Scientists in Basic Research(YSBR-024)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0880000)the Xinjiang Tianchi Talents Program.ARO’s work was supported by the Russian Science Foundation(grant 24-43-00162).
文摘As a critical component of polarization devices and optical devices,birefringent crystals are widely used in high-tech fields such as laser communication,laser polarization engineering,and high-precision scientific research instruments.In this study,two new hydroxyl borates,KB_(7)O_(9)(OH)_(4)and KB_(7)O_(10)(OH)_(2),were synthesized successfully via the hydrothermal method.The two hepta-borates feature different fundamental building units:[B_(7)O_(10)(OH)_(4)]in KB_(7)O_(9)(OH)_(4)and[B_(7)O_(12)(OH)_(2)]in KB_(7)O_(10)(OH)_(2).These units polymerize through oxygen atoms to form a one-dimensional(1D)infinite[B_(7)O_(10)(OH)_(4)]chain and a two-dimensional(2D)[B_(7)O_(12)(OH)_(2)]layer,respectively,demonstrating a hydroxyl-induced structural reconstruction.Notably,the 1D[B_(7)O_(9)(OH)_(4)]_(∞)infinite chain in KB_(7)O_(9)(OH)_(4)represents the first such structure identified in inorganic hydrated hepta-borates,as confirmed by the ICSD database.Performance characterization reveals that both compounds exhibit deep-UV transparency(with cut-off wavelengths shorter than 200 nm)and moderate birefringence values ranging from 0.041 to 0.078 at 546 nm,highlighting their potential as deep-UV birefringent crystal candidates.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41373010 & 41590624)
文摘In the deep Earth, hydrogen mainly occurs as structural hydroxyl and molecular water in minerals and melts, constituting mobile and immobile aqueous components. Hydrous minerals contain hydrogen which occupies a specific structural position and constitutes an indispensable component of chemical formulae. On the other hand, nominally anhydrous minerals do not contain hydrogen in their chemical formulae, but can host trace amounts of water in structural position and lattice defect. The molecular water may occur in the lattice defect as fluid/melt inclusions in minerals. Even though the water content of nominally anhydrous minerals is very limited generally in the order of ppm(parts per million), they may play a significant role in influencing the physicochemical properties of mineral and rock systems. With the continuous improvement of modern instrumentations, the analytical methodology exhibits trends for higher spatial resolution, lower detection limit and integral multiple methods on the water amount and its isotopic ratio. Among these methods, Fourier transform infrared spectrometry remains the most widely used, while secondary ion mass spectrometry, continuous flow mass spectrometry, elastic recoil detection analysis and Raman spectrometry are promising. This paper provides a brief review on the methodological progress and their applications to the analysis of structural water in nominally anhydrous minerals.
