skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Clathrate BaNi2P4: An Interplay of Heat and Charge Transport Due to Strong Host–Guest Interactions

Journal Article · · Chemistry of Materials

Heat and charge transport properties of the metallic unconventional clathrate BaNi2P4, hosting Ba cations in oversized Ni8P16 cages, are investigated. A novel method of single-crystal growth was developed, yielding 2–3 mm sized crystals of BaNi2P4. We also developed a setup to accurately measure thermal conductivity and electrical resistivity of the synthesized single crystals in a wide temperature range avoiding crystal remounting. BaNi2P4 has a metallic temperature dependence of its electrical resistivity (decreasing with decreasing temperature) and manifests an unconventional T2 power law for 50 K < T < 300 K; below 50 K, the power-law exponent increases gradually such that below 10 K the power law is T5, a predicted but extremely rarely experimentally observed dependence for peculiar electron–phonon interactions. Electronic band structure calculations, consistent with measurements of de Haas–van Alphen oscillations, show large band dispersions with significant contributions of Ba orbitals to states near the Fermi level, which is atypical for clathrates. The thermal properties of BaNi2P4 were probed using a combination of variable-temperature single-crystal X-ray diffraction experiments, heat capacity measurements, first-principles phonon dispersion calculations, and inelastic neutron scattering measurements. BaNi2P4 exhibits significant hybridization of the Ba-guest and Ni–P-framework vibrational modes, which may be enhanced via the detected split of the Ba position, which results in strong Ba-framework interactions.

Research Organization:
Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; SC0008931; SC0001299; SC0019299; AC05-00OR22725
OSTI ID:
1668270
Alternate ID(s):
OSTI ID: 1684683
Report Number(s):
IS-J-10,190
Journal Information:
Chemistry of Materials, Vol. 32, Issue 18; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (30)

Clathrate thermoelectrics journal October 2016
III–V Clathrate Semiconductors with Outstanding Hole Mobility: Cs 8 In 27 Sb 19 and A 8 Ga 27 Sb 19 ( A = Cs, Rb) journal December 2019
Unconventional Clathrates with Transition Metal–Phosphorus Frameworks journal December 2017
Mechanism of superconductivity in the polyhedral-network compound Ba8Si46 journal September 2003
High-Pressure Synthesis of a New Silicon Clathrate Superconductor, Ba 8 Si 46 journal January 2000
Thermopower enhancement by encapsulating cerium in clathrate cages journal September 2013
The Smaller the Better: Hosting Trivalent Rare-Earth Guests in Cu–P Clathrate Cages journal June 2018
Introducing a Magnetic Guest to a Tetrel-Free Clathrate: Synthesis, Structure, and Properties of Eu x Ba 8– x Cu 16 P 30 (0 ≤ x ≤ 1.5) journal October 2011
EuNi 2 P 4 , the first magnetic unconventional clathrate prepared via a mechanochemically assisted route journal January 2020
Glasslike Heat Conduction in High-Mobility Crystalline Semiconductors journal January 1999
Structural, transport, magnetic, and thermal properties of Eu 8 Ga 16 Ge 30 journal November 2001
Ueber die Wärme-Leitungsfähigkeit der Metalle journal January 1853
Breakdown of Fermi-liquid theory in a copper-oxide superconductor journal December 2001
Anisotropic Violation of the Wiedemann-Franz Law at a Quantum Critical Point journal June 2007
Thermal and electrical transport across a magnetic quantum critical point journal April 2012
Anomalous Reduction of the Lorenz Ratio at the Quantum Critical Point in YbAgGe journal April 2013
Anomalously low electronic thermal conductivity in metallic vanadium dioxide journal January 2017
Twisted Kelvin Cells and Truncated Octahedral Cages in the Crystal Structures of Unconventional Clathrates, AM 2 P 4 (A = Sr, Ba; M = Cu, Ni) journal June 2015
Modular portable unit for thermal conductivity measurements in multiple cryogenic/magnetic field environments journal January 2018
Field-dependent transport critical current in single crystals of Ba(Fe 1 − x TM x ) 2 As 2 (TM = Co, Ni) superconductors journal April 2010
High-efficiency thermoelectric Ba 8 Cu 14 Ge 6 P 26 : bridging the gap between tetrel-based and tetrel-free clathrates journal January 2017
Chemical Bonding and Transport Properties in Clathrates-I with Cu–Zn–P Frameworks journal April 2018
Breaking the Tetra-Coordinated Framework Rule: New Clathrate Ba 8 M 24 P 28+ δ ( M =Cu/Zn) journal January 2017
Crystal Structures of Thermoelectric n- and p -type Ba 8 Ga 16 Ge 30 Studied by Single Crystal, Multitemperature, Neutron Diffraction, Conventional X-ray Diffraction and Resonant Synchrotron X-ray Diffraction journal December 2006
New insights into the application of the valence rules in Zintl phases—Crystal and electronic structures of Ba7Ga4P9, Ba7Ga4As9, Ba7Al4Sb9, Ba6CaAl4Sb9, and Ba6CaGa4Sb9 journal April 2016
Ba3P3I2 und Ba5P5I3: Stufenweise Oxidation von Bariumphosphid mit Iod journal March 2003
BaNi2Ge and Ca4Ni4Ge3 - Two layered Structures with $\rm ^2_\infty$[Ni2Ge] and, $\rm ^2_\infty$[Ni4Ge3] Networks  journal May 2010
Atomic Interactions in the p-Type Clathrate I Ba 8 Au 5.3 Ge 40.7 journal February 2011
Structure-Related Thermal Properties of Type-VII Clathrates SrNi 2 P 4 and BaNi 2 P 4 at Low Temperature journal May 2018
Avoided crossing of rattler modes in thermoelectric materials journal August 2008