Conductive property of Zr_0.1Fe_0.9V_1.1Mo_0.9O₇ with low thermal expansion*

Abstract

Low thermal expansion materials are mostly ceramics with low conductive property, which limits their applications in electronic devices. The poor conductive property of ceramic ZrV2O7 could be improved by bi-substitution of Fe and Mo for Zr and V, accompanied with low thermal expansion. Zr0.1Fe0.9V1.1Mo0.9O7 has electrical conductivity of 8.2×10−5 S/cm and 9.41×10−4 S/cm at 291 K and 623 K, respectively. From 291 K to 413 K, thermal excitation leads to the increase of carrier concentration, which causes the rapid decrease of resistance. At 413–533 K, the conductivity is unchanged due to high scattering probability and a slowing increase of carrier concentration. The conductivity rapidly increases again from 533 K to 623 K due to the intrinsic thermal excitation. The thermal expansion coefficient of Zr0.1Fe0.9V1.1Mo0.9O7 is as low as 0.72×10−6 K−1 at 140–700 K from the dilatometer measurement. These properties suggest that Zr0.1Fe0.9V1.1Mo0.9O7 has attractive application in electronic components.

Near-zero thermal expansion in β-CuZnV2O7 in a large temperature range

“…in the temperature range of 300 K-873 K. [28] Nevertheless, the doped NTE materials mentioned above are all multi-site substitutions, which is not economical and high-efficiency. Actually, the compounds by individual substitution in the family of B 2 V 2 O 7 (B = Cu, Zn) have been suc-cessfully synthesized.…”

Low thermal expansion and broad band photoluminescence of Zr0.1Al1.9Mo2.9V0.1O12 *

“…[11][12][13][14][15] In order to solve these two problems, substitutions of tervalent transition elements for A of A 2 M 3 O 12 were performed. [16][17][18][19][20][21][22][23][24][25][26][27] On the basis of the A 2 M 3 O 12 materials, the trivalent elements at site A were replaced by tetravalent elements and the hexavalent ions at site M were partly replaced by pentavalent ions in order to maintain the valence balance. After the elements at sites A and M in A 2 M 3 O 12 were replaced with the ions with the same or different valences, the expansion coefficient was significantly changed and the phase transition temperature decreased.…”