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Title: Polar materials with isolated V4+ S = 1/2 Triangles: NaSr2V3O3(Ge4O13)Cl and KSr2V3O3(Ge4O13)Cl

Journal Article · · Chemistry of Materials
 [1];  [2];  [1];  [2];  [1]
  1. Clemson Univ., Clemson, SC (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, crystals of ASr2V3O3(Ge4O13)Cl, A = Na, K, were synthesized from high-temperature hydrothermal brines, and their structure and magnetic properties were investigated. These materials present a unique combination of a salt inclusion lattice, a polar crystal structure, and isolated V4+ (S = 1/2) trimer magnetic clusters. The structures consist of a trimeric V3O13 unit based on V4+ (S = 1/2), having rigorous 3-fold symmetry with a short V–V separation of 3.325(3) Å. The trinuclear V4+ units are formed by three edge shared VO6 octahedra sharing a central μ3-oxygen atom, which also imparts a polar sense on the structure. The V3O13 units are isolated from one another by tetranuclear Ge4O13 units, which are similarly arranged in a polar fashion, providing a unique opportunity to study the magnetic behavior of this triangular d1 system as a discrete unit. Magnetization measurements indicate spin-1/2 per V atom at high temperature, and spin-1/2 per V3 trimer at low temperature, where two V moments in each triangle are antiferromagnetically aligned and the third remains paramagnetic. The crossover between these two behaviors occurs between 20 and 100 K and is well-described by a model incorporating strong antiferromagnetic intra-trimer interactions and weak but nonzero inter-trimer interactions. More broadly, the study highlights the ability to obtain new materials with interesting structure–property relationships via chemistry involving unconventional solvents and reaction conditions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1350950
Journal Information:
Chemistry of Materials, Vol. 29, Issue 3; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (1)

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