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High-pressure synthesis, crystal structure, and properties of iron-based spin-chain compound <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ba</mml:mi><mml:mn>9</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>15</mml:mn></mml:msub></mml:mrow></mml:math>
We report the synthesis of a quasi-one-dimensional (1D) iron selenide ${\mathrm{Ba}}_{9}{\mathrm{Fe}}_{3}{\mathrm{Se}}_{15}$. It was synthesized at high temperature and high pressure of 5.5 GPa and systematically studied via structural, magnetic, and transport measurements at both ambient and high pressure. ${\mathrm{Ba}}_{9}{\mathrm{Fe}}_{3}{\mathrm{Se}}_{15}$ crystallizes in a monoclinic structure and consists of face-sharing $\mathrm{Fe}{\mathrm{Se}}_{6}$ octahedral …