EuPtP: a new mixed valent europium-system

Observation of two charge ordering transitions in the valence-fluctuating EuPtP by resonant x-ray diffraction

“…A preliminary x-ray diffraction experiment suggests staggered displacement of the PtP layers ͑and inequivalent Eu environments͒ along the c axis at low temperatures. 13 The temperature dependence of the europium valence has already been reported using Mössbauer spectroscopy ͑MS͒ and x-ray absorption spectroscopy ͑XAS͒. 13 The average valence extracted from XAS measurements increases from 2.16 at 295 K to 2.40 at 4 K while the Mössbauer spectrum directly indicates the inhomogeneous valence state of the Eu ions.…”

“…The lattice-constant c shrinks a great deal as lowering temperature, particularly at the first-order transitions located at T 1 = 235 K and T 2 = 190 K, while the lattice constant a increases slightly with decreasing temperature. 13 We refer to the phase above T 1 , the phase between T 1 and T 2 , and the phase below T 2 as the ␣ phase, the ␤ phase, and the ␥ phase, respectively. A preliminary x-ray diffraction experiment suggests staggered displacement of the PtP layers ͑and inequivalent Eu environments͒ along the c axis at low temperatures.…”

Equiatomic Intermetallic Europium Compounds: Syntheses, Crystal Chemistry, Chemical Bonding, and Physical Properties

“…These valence instabilities were first discovered for EuPtP. 89 The structures of EuNiP, EuPdP, and EuPtP are closely related to the ZrBeSi type, but deviations occur with dependence of the europium valence state. This behavior is temperature dependent and tends toward trivalent europium ingoing to lower temperatures.…”

Structure and Properties of Mixed‐valence Compound Eu5Zr3S12

“…Inhomogeneous mixed-valence associated with Verwey-transitions have been observed in Eu 3 S 4 [7], Eu 4 As 3 [8] and in the metallic compounds EuPtP [9,10], EuPdAs [11] and EuNiP [12,13].…”