Critical behavior of crystal lattice of NaV2O5

✍ Scribed by H Nakao; K Ohwada; N Takesue; Y Fujii; M Isobe; Y Ueda

• Book ID: 104152016
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 100 KB
• Volume: 60
• Category: Article
• ISSN: 0022-3697
• DOI: 10.1016/s0022-3697(99)00060-8

✦ Synopsis

Critical behavior of crystal lattice was investigated by X-ray scattering for both stoichiometric NaV 2 O 5 and Na-deficient Na x V 2 O 5 (x 0.99-0.96). Critical exponents were determined from superlattice reflections with a wave number vector Q 1=2; 1=2; 1=4; specifying a lattice modulation formed below T C 35 K. The previously observed anomalous lattice strain below T C was found to be a secondary order parameter driven by a primary order parameter which is an atomic displacement with Q governing the low-temperature crystal structure. The temperature-concentration phase diagram was also determined and the transition temperature was found to decrease linearly with increasing deficiency x as dT C =dx 4:2 K=%: