Noncentrosymmetric γCsIO Obtained from IO Polyhedral Rearrangements in the Centrosymmetric βPhase.

We report the synthesis and optical properties of noncentrosymmetric (NCS) γCsIO that was obtained through IO polyhedral rearrangements from centrosymmetric (CS) β-CsIO. Trifluoroacetic acid (TFA) acts as a structure-directing agent and plays a key role in the synthesis. It is suggested that the function of TFA is to promote rearrangement reactions found in the organic synthesis of stereoisomers.

Lone-pair stabilized channels and blocked transport in apatite-related structures.

Two apatite-related silicates compounds, TbPbSiO (I) and PbSiPO (II), were obtained in the crystalline forms. Structure and ELF calculated results reveal that the lone pair cation of Pb preferentially occupies the site, and the repulsion between the mutual lone pair stabilizes channels. Moreover, combining conductivity results this preference has the important implications of exclusion and blocking the movement of the oxide ion in the channel of apatite-related structures.

BaZnBe(BO)F: a novel zinc-beryllium borate with SBBO-type structure overcoming the polymorphism problem.

A novel zinc-beryllium borate BaZnBe2(BO3)2F2 was grown by a high-temperature flux method for the first time. It crystallizes in P3[combining macron] with the cell parameters of a = b = 4.5998, c = 7.

KNiB O F : A Layered Fluorooxoborate with Charge-Oriented Ordering.

A layered fluorooxoborate, KNiB O F , contains a new (B O F ) group built of one planar (BO ) triangle and three tetrahedral (BO F) units. Those units are joined together by sharing the oxygen atoms to form a 2-dimensinal (BO F) BO ) layer. K and Ni occupy on the sides with F and O of the (BO F) BO ) layer with a high (positive charge) to high (negative charge) and low to low coordination.

High-Performance Magnetic Refrigerant Featuring One-Dimensional Gd-O Chains and O-Gd Triangles.

Magnetic cooling at low temperature has attracted intensive interest in cryogenics research, which may become important as cooling medium for long-wave photon detectors to support space exploration. Here, we report a Gd-based quaternary magnetic refrigerant material, Gd BSi O , containing chains of face-shared GdO polyhedra and geometrically frustrated OGd triangles. Magnetic measurements indicate that Gd BSi O exhibits a large magnetocaloric effect (MCE) about 1.