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The new polymorph of sodium tetraborate HP‐Na2B4O7 was synthesized under high‐pressure / high‐temperature conditions of 6 GPa and 1000 °C in a multianvil apparatus with a Walker‐type module. HP‐Na2B4O7 crystallizes with nine formula units per cell in the trigonal chiral space groups P3221 or P3121. The parameters are a = 765.5(2), c = 2142.3(4) pm, V = 1.0872(3) nm3, R1 = 0.0581, and wR2 = 0.0809...
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