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Planar 44d 12 gp s
“Zigzag”-chains of corner-sharing trigonal planar [BO3] units are ...
![“Zigzag”-chains of corner-sharing trigonal planar [BO3] units are ...](https://www.researchgate.net/publication/369109774/figure/fig4/AS:11431281138603750@1680769177627/Zigzag-chains-of-corner-sharing-trigonal-planar-BO3-units-are-formed-along-the.jpg)